PSC Box Bridge Single Span for structural engineers

PSC Box Bridge Single Span for structural engineers

1. Single Span PrestressedPost-Tensioned
Box Girder Bridge
Tutorial
MIDAS
Technical
Material

2. 00
Single Span PSC Box Girder Bridge
Program Version Civil 2019 (v2.1)
Revision Date Dec 08, 2018
In this tutorial we will learn the following things:
-How to generate PSC box section.
-How to define construction stages for the given construction sequence of the bridge.
-How to simulate boundary conditions and assign static and prestress load in midas Civil.
-How to define moving load as per IRC:6-2016 in midas Civil.
-How to interpret the various results like stresses represented by midasCivil.
-How to carry out design for PSC box girder as per IRC:112-2011.
Contents
Step 1: Initial Setting
Step 2: Material & Section Definition
Step 3: Geometric Modelling
Step 4: Group Definition
Step 5: Boundary Definition
Step 6: Load Definition
Step 7: CS Definition
Step 8: Analysis Control
Step 9: Reinforcement
Step 10: Analysis
Step 11: Result
Step 12: PSC Design

3. Single Span Prestressed Box Girder Bridge3
StepStep
SpecificationsofBridge:
BridgeType: SingleSpanPSCboxgirder
SpanLength: 40m
Width: 8.5m(7.5mclearcarriageway)
DesignCode: IRC:112:2011
TimeDependentMaterial: IRC:112:2011
Overview00

4. Single Span Prestressed Box Girder Bridge4
StepStep
Invoke midas Civil
Open New File
Select the Unit System [ kN, m]
Save as ‘Single Span PSC Box Girder’
1
2
3
Procedure
.
3
2
1 Initial Setting01
1

5. Single Span Prestressed Box Girder Bridge5
StepStep
Go to “Properties”
Click on “Material Properties”
Click on “Add” to define materials
Define Material data:
Name> Tendon
Type of Design: Steel
Steel Standard: IS(S)
DB: Fe540
Click on Apply
Name > M50
Type of design> Concrete
Concrete Standard > IS (RC)
DB: M50
Click on OK
1
2
3
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5
2
3
4
1
6
7
7
6
5
Procedure
2-1 Material & Section Definition–Material Definition02

6. Single Span Prestressed Box Girder Bridge6
StepStep
1
2
3
4
5
Change unit system [ N, mm ]
Go to “Properties”
(Creep/Shrinkage)”
Click on “Add” to define properties
Define Creep / Shrinkage data:
Name > M50 C&S
Code > INDIA (IRC:112-2011)
Compressive strength of concrete at
the age of 28 days > 50 N/mm
2
Relative Humidity of ambient
environment (40–99) > 70
Notational size of member > 1000mm
Age of concrete at the beginning of
shrinkage > 3 days
Click on Show Resultto see the graph
Click on OKto add the C&S property.7
6
2
3
4
6 7
Note:Togetthecreep&shrinkagestrains,thevalueofrelativehumidityistobeconsideredas70%,Notationalsizeofmember,has
1000mmandAgeofconcreteatthebeginningofshrinkageas3days.Later,thehvaluewouldbeautomaticallyupdatedfor
compositesections
1
5
Procedure
02
2-2 Material & Section Definition –Time Dependent Material Properties (Creep &Shrinkage)

7. Single Span Prestressed Box Girder Bridge7
StepStep
1
2
3
4
Go to “Properties”
Click on “Comp. Strength”
Click on “Add” to define properties
Define Compressive Strength data:
Name > M50 Comp
Type > Code
Development of Strength > Code >
INDIA (IRC:112-2011)
Mean compressive strength of concrete
at age of 28 days (fck+delta_f) > 50 +
10 N/mm
2
Click on Redraw Graph
Click on OK
5
6
2
1
5 6
4
3
Procedure
2-3 Material & Section Definition –Time Dependent Material Properties (Comp. Strength)02

8. Single Span Prestressed Box Girder Bridge8
StepStep
1
2
3
4
5
Go to “Properties”
Click on “Material Link”
Time Dependent Material Link Data
Creep/Shrinkage >M50 C&S
Comp. Strength >M50 Comp
Double click on M50under
Materials to shift it to the Selected
Materials list
Click on “Add / Modify”
Click on “Close”
6
7
8
2
1
7
6
8
4
5
Any time during the modeling, analysis
and design stage, invoking F1 key
takes you to web help.
3
Procedure
2-4 Material & Section Definition –Time Dependent Material Properties (Material Link)02

9. Single Span Prestressed Box Girder Bridge9
StepStep
Mid Section
* All Dimensions are in meters
02

10. Single Span Prestressed Box Girder Bridge10
StepStep
1
2
4
5
Change unit system [ KN, m ]
Go to “Properties” > Section
Properties”
Click on “Add..”
Click on tab “PSC”
Select: ‘PSC-1Cell, 2Cell’ type
Define Mid Section:
Name > Mid Section
Joint On/Off > Check JO1, JI1, JI3, JI5
See the PSC Viewer and enter the
section dimension parameters
Outer box dimensions
HO1: 0.2, BO1: 1.5, HO2: 0.3,
BO1-1: 0.5, HO2-1: 0, BO2: 0.5,
HO3: 2.5, BO3: 2.25
Inner box dimensions
HI1: 0.24, BI1: 2.2, HI2: 0.26,
BI1-1: 0.7, HI2-1: 0, BI2-1: 2.2
HI3: 2.05, BI3: 1.932, HI3-1: 0.71,
BI3-1: 0.7, HI4: 0.2, HI4-1: 0,
HI5: 0.25
Check all Auto options related to
Shear calculations
Click “Change Offset”
Select Offset : Center-Top
& Clickon “OK”
3
Note: The internal Process of section offset is explained in the help file .
Path: Help > Contents > Start > Model > Properties > Section, When Section
tab is opened under offset, click on ‘Details’
6
8
7
2
4
9
1
Click “Show Calculation Results”
Click on “Apply”
10
5
3
6
10
8
7
9
8
Procedure
02
2-5 Material & Section Definition –Mid Section Definition

11. Single Span Prestressed Box Girder Bridge11
StepStep
End Section
0.94
0.71 0.26
0.44
0.268
1.41.3 1.3
1.032 1.0321.4
0.2
0.450.94
0.71 0.26
0.44
0.268
1.41.3 1.3
1.032 1.0321.4
0.2
0.45
* All Dimensions are in meters
02

12. Single Span Prestressed Box Girder Bridge12
StepStep
1
2
4
Define Sup Section:
Name > Sup Section
Joint On/Off > Check JO1, JI1, JI3 & JI5
See the PSC Viewer and enter the
section dimension parameters
Outer box dimensions
HO1: 0.2, BO1: 1.5, HO2: 0.3,
BO1-1: 0.5, HO2-1: 0, BO2: 0.5,
HO3: 2.5, BO3: 2.25
Inner box dimensions
HI1: 0.44, BI1: 2, HI2: 0.26,
BI1-1: 0.7, HI2-1: 0, BI2-1: 2,
HI3: 1.65, BI3: 1.732, HI3-1: 0.71,
BI3-1: 0.7, HI4: 0.2, HI4-1: 0,
HI5: 0.45
Check all Auto options related to
Shear calculations
Click “Change Offset”
Select Offset : Center-Top
& Clickon “OK”
Click on “Apply”
3
4
Note: Invoke the section data window by
following Steps 2 to 5in Page 10.
3
1
2
3
Procedure
02
2-6 Material & Section Definition –Support Section Definition

13. Single Span Prestressed Box Girder Bridge13
StepStep
Diaphragm Section
* All Dimensions are in meters
02

14. Single Span Prestressed Box Girder Bridge14
StepStep
1
2
4
Define Diaphragm Section:
Name > Diaphragm
Joint On/Off > Check JO1
See the PSC Viewer and enter the
section dimension parameters
Outer box dimensions
HO1: 0.2, BO1: 1.5, HO2: 0.3,
BO1-1: 0.5, HO2-1: 0, BO2: 0.5,
HO3: 2.5, BO3: 2.25
Inner box dimensions
HI1: 1, BI1: 0.5, HI2: 0,
HI3: 1, BI3: 0.5,HI4: 0,
HI5: 1
Check all Auto options related to
Shear calculations
Click “Change Offset”
Select Offset : Center-Top
& Clickon “OK”
Click on “OK”
3
4
Note: Invoke the section data window by
following Steps 2 to 5 in Page 10.
1
2
3
3
Procedure
02
2-7 Material & Section Definition –Diaphragm Section Definition

15. Single Span Prestressed Box Girder Bridge15
StepStep
1
2
3
.
Click on tab “Tapered”
Name > Mid-Sup
Section Type > PSC-1CELL
Click on Size-I“Import”
Select “Mid Section”
Click on “Import”
Click on Size-J“Import”
Select “Sup Section”
Click on “Import”
Click “Change Offset”
Select Offset : Center-Top
& Clickon “OK”
Click on “Apply”
4
1
Similarly Define Taper Right Section:
5
Note: The internal Process of calculation of sectional property as per dimensional
variation is explained in the help file. Path: Help > Contents > Start > Model >
Properties > Section > Tapered tab, under Note, click on ‘Details’
2
3
5
Note: Invoke the section data window
by following Steps 2 to 3in Page 10.
4
Click on tab “Tapered”
Name > Sup-Mid
Section Type > PSC-1CELL
Click on Size-I“Import”
Select “Sup Section”
Click on “Import”
Click on Size-J“Import”
Select “Mid Section”
Click on “Import”
Click “Change Offset”
Select Offset : Center-Top
& Clickon “OK”
Click on “OK”
Procedure
2-8 Material & Section Definition –Tapered Section Definition02

16. Single Span Prestressed Box Girder Bridge16
StepStep
1
2
3
.
Click on “Node/Element” of Main
Menu
Click on “Create Nodes”
Go to “Tree Menu”
Coordinates (x,y,z) > 0, 0, 0
Copy : Number of times > 0
Distances (dx, dy, dz) > 0, 0, 0
Click “Apply” and “Close”
4
5
1
4
1)Toinputthenodeco-ordinates
intable,gotoTreeMenu>Tables>
StructureTables>Node
2)TocreateUserdefinedcoordinate
systemgotoStructure>UCS
2
5
3
Procedure
3-1 Geometric Modelling –Create Nodes03

17. Single Span Prestressed Box Girder Bridge17
StepStep
Longitudinal View
40m
Construction Direction
03

18. Single Span Prestressed Box Girder Bridge18
StepStep
Longitudinal Section
Tapered
Section
Support
Section
Mid
Section
13.5m3 m3m
40m Span
Support
Section
Tapered
Section
Mid
Section
3m 3m13.5m
03
0.5 m 0.5 m
Diaphragm
Section
Diaphragm
Section

19. Single Span Prestressed Box Girder Bridge19
StepStep
2
3
Click on “Node/Elements”
Click on “Extrude”
Go to “Tree Menu”
Select Extrude Type “Node -> Line
Element”
Select Element Type “Beam”
Generating Elements:
Select Material “M50”
Select Section “Mid Section”
Select Generation type “ Translate”
Select Translation “Unequal
Distance”
Select Axis “X”
Distances > [email protected],39@1,[email protected]
Click on Select ALL
Click on “Apply”
4
1
1
2
3
5
5
4
Procedure
03
3-2 Geometric Modelling –Extrude Elements

20. Single Span Prestressed Box Girder Bridge20
StepStep
1
2
3
Click on “Node/Element”
Click on “Translate Node”
Select node numbers 2and 43by
entering them in the node
selection box as shown.
Go to “Tree Menu”
Mode “Copy”
Translation “Equal Distance”
dx, dy, dz: “0,-1.9,-3”
Number of Times: “1”
Click “Apply”
4
5
2
1
4
5
3
Procedure
3-3 Geometric Modelling –Translate Nodes03

21. Single Span Prestressed Box Girder Bridge21
StepStep
1
2
3
Click on the Topbutton to switch to
top view
Click on “Node/Element”
Click on “Translate Node”
Click on Select Single button
Select nodes as shown
Go to “Tree Menu”
Mode “Copy”
Translation “Unequal Distance”
Axis: “y”
Distance: “3.8”
Click “Apply”
3
2
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5
7
1
5
4
6
7
Note: Here, translational distance of 3.8m is the transverse distance between the two bearings.
6
Procedure
3-4 Geometric Modelling –Translate Nodes03

22. Single Span Prestressed Box Girder Bridge22
StepStep
1
2
3
Click on the Topbutton to switch to
top view
Click on “Node/Element”
Click on “Translate Node”
Click on Select Singlebutton
Select encircled nodes as shown
Go to “Tree Menu”
Mode “Copy”
Translation “Unequal Distance”
Axis: “z”
Distance: “-0.1”
Click “Apply”
4
5
6
7
Note: Here, bearing thickness is considered as 0.1m.
3
5
4
2
6
7
1
Procedure
3-5 Geometric Modelling –Translate Nodes03

23. Single Span Prestressed Box Girder Bridge23
StepStep
2
3
4
Click on the Front View button to
switch to front view
Go to “Tree Menu”
Click on “Works”
Select the elements as highlighted.
On selection the selected element
number list will be updated as “12
4243”
Drag and Drop Diaphragmover the
model window
1 1
3 3
4
2Procedure
03
3-6 Geometric Modelling –Assigning Diaphragm Section

24. Single Span Prestressed Box Girder Bridge24
StepStep
Click on the Front View button to
switch to front view
Go to “Tree Menu”
Click on “Works”
Select the elements as highlighted.
On selection the selected element
number list will be updated as
“3to539to41”
Drag and Drop Sup Section over the
model window
1
2
3
4
1
3 3
4
2Procedure
03
3-7 Geometric Modelling –Assigning Support Section

25. Single Span Prestressed Box Girder Bridge25
StepStep
Click on the Front View button to
switch to front view
Go to “Tree Menu”
Click on “Works”
Select the elements as highlighted.
On selection the selected element
number list will be updated
as “36to38”
Drag and Drop Mid-Sup over the
model window
1
2
3
4
1
3
4
2Procedure
03
3-8 Geometric Modelling –Assigning Tapered Section

26. Single Span Prestressed Box Girder Bridge26
StepStep
Click on the Front View button to
switch to front view
Go to “Tree Menu”
Click on “Works”
Select the elements as highlighted.
On selection the selected element
number list will be updated as
“6to8”
Drag and Drop Sup-Mid over the
model window
1
2
3
4
1
3
4
2Procedure
03
3-9 Geometric Modelling –Assigning Tapered Section

27. Single Span Prestressed Box Girder Bridge27
StepStep
2
3
Right Click on the ribbon as shown
Check the “Tree Menu 2 “ Option
and another Tree menu will
appear on the right hand side.
Click on “Properties”
Click on “Tapered Group”
Go to “Tree Menu”
Generating Tapered Groups:
Set z-Axis as Linear
Set y-Axis as Linear
Set Group Name as “Mid-Sup”
Go to Tree Menu 2, Double Click on
Mid-SupSection & the element list
will be updated as “36to38”
Click on “Add”
Set Group Name as “Sup-Mid”
Go to Tree Menu 2, Double Click on
Sup-MidSection & the element list
will be updated as “6to8”
Click on “Add”
Click “Close”
2
6
1
1
4
3
6
4
5
7
5
8
7
8
Procedure
03
3-10 Geometric Modelling –Tapered Section Group

28. Single Span Prestressed Box Girder Bridge28
StepStep
2
3
Click on “Properties”
Click on “Change Property” button
Click on > Select All
Go to Tree menu
Click“Apply”
Click “Close”
2
1
4
4
1
Note: Here, the elements are being divided to create the construction joint nodes
which are located at 8m to the right of centerlines of intermediate piers/supports.
3
3
Procedure
03
3-11 Geometric Modelling –Change Property

29. Single Span Prestressed Box Girder Bridge29
StepStep
1Click on the Front View button to
switch to front view.
Go to “Tree Menu”
Click “Group Tab”
Right Click on Structure Group
Give Name as : Structure
Assigning Structure Group
Click on Select ALL
Drag & drop in the Structure group
“Structure”over the Model View
window
Note: Structure groups can be defined in Define Structure Group first. Next, the desired nodes and elements can be selected in the Group
tab of the Tree Menu and assigned to the groups by Drag & Drop.
Structure
2 2
3
4
3
4
1
Procedure
04
4-1 Group Definition –Creating and Assigning Structure Group

30. Single Span Prestressed Box Girder Bridge30
Step
1
2
Go to “Tree Menu”
Right click on “Boundary Group”
and Click on “New”
Give Name as: “SUB”
Click : Enter
Right click on “Load Group” and click
on “New…”
Name: “SW”
Click“Add”
Name :“SIDL”
Click“Add”
Name: “PS1-”
Suffix: “1to4”
Click “Add”
Note: 1) Structure groups are especially dedicated to Construction Stage analysis (of a sequential bridge construction) whereeach part of
the total structure erected in each stage needs to be identified as a different structure from those of other stages.
2) Boundary groups are especially dedicated to Construction Stage analysis (of a sequential bridge construction) where each part of
the total structure erected in each stage may retain different boundary conditions from those of other stages.
3) Load groups are especially dedicated to Construction Stage analysis (of a sequential bridge construction) where each part of the
total structure erected in each stage may be subjected to different loadings.
3
Procedure
2
3
1
4-2 Group Definition –Creating Boundary & Load Groups04

31. Single Span Prestressed Box Girder Bridge31
StepStep
1
2
3
Click on the arrow as shown to switch
to the isometric view
Click “Boundary”
Click “Rigid Link…”
Go to “Tree Menu”
Go to “Boundary” tab
Select Boundary Group Name “SUB”
Click on “Rigid Body”
Check “Copy Rigid Link”
Select Axis “x”
Enter Distances: “39.50”
Click in “Master Node Number:”
ClickHighlightedNode “2”
Select Node “45”& Node “47”using
Select Single
Click“Apply”
Click “ Close”
4
1
2
3
2
45
47
4
6
6
Procedure
05
5-1 Boundary Definition –Defining & Assigning Rigid Links
5
5

32. Single Span Prestressed Box Girder Bridge32
StepStep
Bearing Layout
1.9m
Longitudinal Direction
40m
Fixed
05

33. Single Span Prestressed Box Girder Bridge33
StepStep
1
2
3
Click on the arrow as shown to
switch to the isometric view
Click “Boundary”
Click “Elastic Link…”
Go to “Tree Menu”
Select Boundary Group Name “Sub”
Enter “SDx”> 10e+6kN/m
“SDy”> 10e+6 kN/m
“SDz”> 10e+6 kN/m
“SRx”> 10 KN.m/Rad
“SRy”> 10 KN.m/Rad
“SRz”> 10 KN.m/Rad
Click in input box “2 Nodes:”
ClickHighlightedNode “45” and then
Click HighlightedNode “49”
Click “ Close”
4
5
Note: The elastic links stiffness in different directions are provided to simulate the layout of
bearings .
1
2
3
45
49
5
4
Procedure
05
5-2 Boundary Definition –Defining & Assigning Elastic Links

34. Single Span Prestressed Box Girder Bridge34
StepStep
Repeat Step 4 for the following data:
At nodes 47 and 51
Enter “SDx”> 10e+6kN/m
“SDy”> 10 kN/m
“SDz”> 10e+6 kN/m
“SRx”> 10 KN.m/Rad
“SRy”> 10 KN.m/Rad
“SRz”> 10 KN.m/Rad
At nodes 48 and 52
Enter “SDx”> 10e+6kN/m
“SDy”> 10 kN/m
“SDz”> 10 kN/m
“SRx”> 10 KN.m/Rad
“SRy”> 10 KN.m/Rad
“SRz”> 10 KN.m/Rad
At nodes 46and 50
Enter “SDx”> 10e+6kN/m
“SDy”> 10e+6 kN/m
“SDz”> 10 kN/m
“SRx”> 10 KN.m/Rad
“SRy”> 10 KN.m/Rad
“SRz”> 10 KN.m/Rad
Note: The elastic links stiffness in different directions are provided to simulate the layout of
bearings .
1
1
2
3
2 3
Procedure
5-3 Boundary Definition –Defining & Assigning Elastic Links05

35. Single Span Prestressed Box Girder Bridge35
StepStep
1
2
3
Click on the button as shown &
switch to the isometric view
Click “Boundary”
Click “Define Supports”
Go to “Tree Menu”
Select Boundary Group Name “SUB”
Click on D-ALL to simulate pinned
condition.
Select encircled nodes with Node
numbers “49 51” using select by
Window
Click “Apply”
4
6
Note: The elastic links stiffness in different directions are provided to simulate the layout of
bearings
5
2
3
5
6
4
1
Procedure
5-4 Boundary Definition –Defining & Assigning Supports05

36. Single Span Prestressed Box Girder Bridge36
StepStep
1
2
3
Click on the button as shown &
switch to the isometric view
Click “Boundary”
Click “Define Supports”
Go to “Tree Menu”
Select Boundary Group Name “SUB”
Check “Dy” and“Dz” to simulate
roller
Support condition.
Select encircled nodes with Node
numbers “50” “52”using Select by
Window
Click “Apply”
4
5
Note: The elastic links stiffness in different directions are provided to simulate the layout of
bearings
2
3
5
6
4
1
Procedure
5-5 Boundary Definition –Defining & Assigning Supports05

37. Single Span Prestressed Box Girder Bridge37
StepStep
1
2
3
.
Go to “Load” tab
Click “Static Load Cases”
Define Static Load Cases
For Type: “Construction Stage Load(CS)”
Name : “Self Weight”
Click “Add”
Name : “SIDL-WC”
Click “Add”
Name : “SDL-CB”
Click “Add”
Name : “Prestress”
Click “Add”
For Type: “Temperature (T)”
Name : “Temperature Rise”
Type : Click “Add”
Name : “Temperature Fall”
Click “Add”
For Type: “Temperature Gradient (TPG)”
Name : “Positive Temp. Grad.”
Click “Add”
Name : “Negative Temp. Grad.”
Click “Add”
Click on > Close
1
2
3
4
4
Procedure
6-1 Load Definition –Defining Static Load Cases06

38. Single Span Prestressed Box Girder Bridge38
StepStep
Assigning Self Weight
Go to “Load” tab
Click “Self Weight…”
Go to “Tree Menu”
Select Load Case Name “Self Weight”
Select Load Group Name “SW”
Enter Self Weight Factor, Z: “-1”
Click “Add”
1
2
2
1
3
4
4
3
Procedure
6-2 Load Definition –Assigning Self Weight06

39. Single Span Prestressed Box Girder Bridge39
StepStep
1
4
Assigning Wearing Course Dead Load
Go to “Load” tab
Click Beam Loads > “Element”
Go to “Tree Menu”
Select Load Case Name “SIDL-WC”
Select Load Group Name “SIDL”
Select Load Type “Uniform Loads”
Select Load Direction “Global Z”
Enter w “-16.5” KN/m
Click on Select single to select all
superstructure Elements
Click “Apply”
1
4
2
2
3
4
5
3
4
Procedure
6-3 Load Definition –Assigning SIDL (Element Beam Loads)06

40. Single Span Prestressed Box Girder Bridge40
StepStep
1
2
Assigning Crash Barrier Dead Load
Go to “Load” tab
Go to Beam Loads > “Element”
Go to “Tree Menu”
Select Load Case Name “SIDL-CB”
Select Load Group Name “SIDL”
Select Load Type “Uniform Loads”
Check “Eccentricity”
Check “offset” Option
Select Direction “Global Y”
Enter Distance I-End “-4.25”m
Select Load Direction “Global Z”
Enter w “-8” KN
Click on Select Previous
Click “Apply”
Enter Distance I-End “4.25”m
Click on Select Previous
Click “Apply”
1
2
3
4
3, 6
5
6
8
7
Procedure
4, 7
6-4 Load Definition –Assigning SIDL (Element Beam Loads)06
5, 8

41. Single Span Prestressed Box Girder Bridge41
StepStep
1
2
3
Change unit system [N,mm]
Go to “Load” of Main Menu
Click “Temp/Prestress”
Click “Tendon Property”
Click “Add”
Enter Tendon Name “Tendon”
Select Tendon Type “Internal(Post-
Tension”
Select Material “Tendon”
Click “…” in the dialog box for Total
Tendon Area
Select Strand Diameter
“15.2mm(0.6”)”
Enter Number of Strands “19”
Click “OK”
Enter Duct Diameter “110”mm
Select Relaxation Coefficient “India
(IRC:112-2011) –Low”
Enter Ultimate Strength “1860”
Enter Yield Strength “1581”
Enter Curvature Friction Factor
“0.17”
Enter Wobble Friction Factor as
“2e-6”/mm
Enter Anchorage Slip Begin : “6”
Enter Anchorage Slip End : “6”
Select Bond Type “Bonded”
Click “OK”
Click “Close”
4
2
3
1
4
5
7
7
5
6
6
Procedure
6-5 Load Definition –Defining Tendon Property06

42. Single Span Prestressed Box Girder Bridge42
StepStep
1
2
3
Go to “Load” tab
Click “Temp/Prestress”
Click “Tendon Profile”
Click “Add”
Enter Tendon Name “A1L”
Select Tendon Property as “Tendon”
Click in “Assigned Elements”
and select/type element no. 1to43
as shown in “Model View “
Select Input Type “3D”
Select Curve Type “Round”
Select Reference Axis “Element”
Open excel sheet “Cable Coordinates”
*From excel sheet copy Tendon
Coordinates for “A1L”
Paste on “Input Table”
Select Profile Insertion Point “End-I”
Enter x Axis Rotation as “-11.31”
Type “1”
Click “OK”
Generate A2L, A3L & A4L by
following Step 4
Generate A1R, A2R, A3R & A4R by
following Step 4 and usingx Axis
Rotation as “11.31” instead of “-
11.31”
Click “Close”
4
1
5
7
2
*Select respective cable coordinates and paste it in input table.
Note: An insertion point is used as a point of reference for the tendon profile in the Global
Coordinate System (GCS). Only one profile is needed for a precast beam in spite of the
number of elements (four in this example) that we are using to model it.
3
6
4, 5
6
Procedure
6-6 Load Definition –Defining Tendon Profile06
7

43. Single Span Prestressed Box Girder Bridge43
StepStep
1
2
3
Go to “Load” tab
Click “Temp/Prestress”
Click “Tendon Prestress”
Go to “Tree Menu”
Select Load Case Name “Prestress”
Input by “Stress”
Select Jacking “Both”
Enter Begin “1395”N/mm
2
Enter End “1395” N/mm
2
Select Group Name “PS1-1”
Select all tendons in the left box
Tendons Click on “>” , All tendons
will now
move to the right box under the
head
Selected.
Click “Add”
5
4
4
5
1
2
3
Procedure
6-7 Load Definition –Assigning Tendon PrestressLoads06

44. Single Span Prestressed Box Girder Bridge44
StepStep
1
2
Go to “Tree Menu”
Go to “Works” pane
Go to Static LoadsPrestress
Right Click on “Tendon Prestress
Loads” and click on “Tables”
Change Load Groups as shown by
clicking on each load group.
Right Click on Tendon Prestress
Loads and Click on Close Window
3
1
3
2
Procedure
6-8 Load Definition –Changing PrestressGroups06

45. Single Span Prestressed Box Girder Bridge45
StepStep
This function allows us to define necessary
construction stages to analyze a bridge
structure reflecting the effects of evolving
structure configurations and elastic and
time dependent (creep and shrinkage)
displacements.
Each construction stage is identified with
activated (or deactivated) element,
boundary and load groups. Each stage
retains a unique element group, a
boundary group and a load group, forming
an interim independent structure. The
stage information that was difficult to
define in Wizard can now be added or
modified using this function.
Note:
The results of all prior construction stages are
accumulated and applied to the current stage. Once
activated elements, boundary conditions and loads
remain active until they are deactivated. When an
element is removed, the internal forces are internally
imposed to the contiguous remaining elements in
the opposite directions.
Stage Days Details
CS 1 14 First Span is Launched with structure group age of 21 days.
CS 2 2 First Span is stressed sequentially
CS3 10000Application of Crash Barrier and Wearing Course Load.
Construction Stage Overview
07

46. Single Span Prestressed Box Girder Bridge46
StepStep
1
2
Go to “Load” of Main Menu
Click “Construction Stage Analysis
Data”
Click “Define Construction Stage…”
Define Stage 1:
Click “Add”
Enter Name “CS1”
Enter Duration “14” days
Click “Element” tab
Select “Structure” under Group List
Enter Age “21”
Click “Add”
3
5
1
2
6
10
9
8
7
6
5
4
9
3
7
8
4
10
Note:Agereflectstheeffectsofcreepandshrinkageontheelements.TheAge
representsthetimeelapsedfromthetimeofconcretecastingpriortothestartof
thecurrentconstructionstagebeingdefined.Thatis,theAgeisthematurityofthe
elementgroupsatthestartofthecurrentstagebeingdefined.TheAgetypically
representsthetimespanfromthetimeofconcretecastingtothetimeofremoval
offormworkforhorizontalmemberssuchasslabs.
Procedure
7-1 CS Definition –Stage ‘CS1’ Formulation (Element Tab)07

47. Single Span Prestressed Box Girder Bridge47
StepStep
1
2
Click “Boundary” tab
Select “SUB” under Group List
Select “Deformed”
Click “Add”
3
4
2
3
4
1
Procedure
7-2 CS Definition –Stage ‘CS1’ Formulation (Boundary Tab)07

48. Single Span Prestressed Box Girder Bridge48
StepStep
Click “Load” tab
Select“SW” under Group List
Select Active Day “First”
Click “Add”
Click “OK”
1
4
1
2
3
4
5
5
2
3
Procedure
7-3 CS Definition –Stage ‘CS1’ Formulation (Load Tab)07

49. Single Span Prestressed Box Girder Bridge49
StepStep
Click on > Add
Enter name > CS2; Duration > 2 (days)
Click “Load”tab
Add 0.02, 0.04, 0.06, 0.08 in
Additional Days
Select “PS1-1” under Group List
Select Active Day as “0.02”
Click “Add”
Repeat Steps 6, 7& 8 with following
details
Select “PS1-2” under Group List
Select Active Day as “0.04”
Click “Add”
Select “PS1-3” under Group List
Select Active Day as “0.06”
Click “Add”
Select “PS1-4” under Group List
Select Active Day as “0.08”
Click “Add”
Click “OK”
1
2
3
4
5
2
3
4
2
3
4
2
3
4
9
6
7
3
5
6
8
2
4
7
1
9
8
Procedure
7-4 CS Definition –Stage ‘CS2’ Formulation (Load Tab)07

50. Single Span Prestressed Box Girder Bridge50
StepStep
Click on > Add
Enter Name “CS3”
Enter Duration “10000”days
Click “Load” tab
Select “SIDL” under Group List
Select Active Day “First”
Click “Add”
Click “OK”
1
2
3
4
5
6
7
3
2
4 5
6
7
1
Procedure
7-5 CS Definition –Stage ‘CS3’ Formulation (Load Tab)07

51. Single Span Prestressed Box Girder Bridge51
StepStep
1
1
2
3
Go to “Load” tab
Click “Temp/Prestress”
Click “Element Temp.”
Click on Select Single and select all
superstructure elements.
Go to “Tree menu”
Select Load Case name as
“Temperature Rise”
Input Final temperature: 25degree C
Click “Apply”
Select all superstructure elements
again as done in Step 4
Select Load Case name as
“Temperature Fall”
Input Final temperature: -25degree C
Click “Apply”
4
5
If temperature units are in degree
Fahrenheit, one can change to degree
Celciusfrom Tools Unit System
Note: An insertion point is used as a point of reference for the tendon profile in the Global Coordinate System
(GCS). Only one profile is needed for a precast beam in spite of the number of elements (four in this example) that
we are using to model it.
3
4
2
5
4
Procedure
6-9 Load Definition –Assigning Temperature Rise (Element Temperature)06

52. Single Span Prestressed Box Girder Bridge52
StepStep
3
1
2
3
Go to “Load” tab
Click “Temp/Prestress”
Click “Beam Section Temp.”
Select all superstructure elements.
Go to “Tree menu”
Select Load Case name as “Positive
Temp. Grad.”
Section Type > PSC/Composite
Select “Element”option for Material
Keep Ref. as “Top”
B > “Section”
Enter H1 as0 mm
Enter H2 as150 mm
Enter T1 as 17.8[C]
Enter T2 as 4[C]
Click on Add
Change Parameters:
Enter H1 as150 mm
Enter H2 as400 mm
Enter T1 as 4[C]
Enter T2 as 0[C]
Click on Add
Change Parameters:
Enter H1 as2850 mm
Enter H2 as3000 mm
Enter T1 as 0[C]
Enter T2 as 2.1[C]
Click on Add
Click “Apply”
4
5
If temperature units are in degree Fahrenheit, one can change to degree Celsius from Tools Unit System
6
6
h1 = 0.15m
h2 = 0.25m
h3 = 0.15m
Positive Temperature
Differences
Reverse Temperature
Differences
h1
h2
h3
h1
h2
h3
h4
h1 = h4 = 0.25m
h2 = h3 = 0.25m
For the given depth of box girder
4
2 5
1
Procedure
6-10 Load Definition –Assigning Positive Temperature Differences (Beam Section Temperature)06

53. Single Span Prestressed Box Girder Bridge53
StepStep
Change Parameters:
Enter H1 as2750 mm
Enter H2 as3000 mm
Enter T1 as -0.8[C]
Enter T2 as -6.6[C]
Click “Apply”
1
2
3
Go to “Load” tab
Click “Temp/Prestress”
Click “Beam Section Temp.”
Select all superstructure elements.
Go to “Tree menu”
Select Load Case name as “Negative
Temp. Grad.”
Section Type > PSC/Composite
Select “Element”option for Material
Keep Ref. as “Top”
B > “Section”
Enter H1 as0 mm
Enter H2 as250 mm
Enter T1 as -10.3[C]
Enter T2 as -0.7[C]
Click on Add
Change Parameters:
Enter H1 as250 mm
Enter H2 as500 mm
Enter T1 as -0.7[C]
Enter T2 as 0[C]
Click on Add
Change Parameters:
Enter H1 as2500 mm
Enter H2 as2750 mm
Enter T1 as 0[C]
Enter T2 as -0.8[C]
Click on Add
4
5
Note: An insertion point is used as a point of reference for the tendon profile in the Global Coordinate System (GCS).
Only one profile is needed for a precast beam in spite of the number of elements (four in this example) that we are
using to model it.
6 6
4
3
2
1
5
Procedure
6-11 Load Definition –Assigning Negative Temperature Differences (Beam Section Temperature)06

54. Single Span Prestressed Box Girder Bridge54
StepStep
Change unit system [kN, m]
Go to “Load” tab
Click “Moving Load”
Moving Load Code > India
Click “Traffic Line Lanes”
Click “Add”
Enter Lane Name “70R”
View the figure provided
Enter Eccentricity “1.155”m
Enter Wheel Spacing “1.93”m
Enter Impact factor “0.1”
Select Vehicular Load Distribution as
“Lane Element”
Select Moving direction as “Both”
Select Selection by “2 Points”
Click in the “Box”
Click on extreme left node of
superstructure i.e. node no. 1
Click on extreme right node of
superstructure i.e. node no. 44
Click “OK”
3
7
1
Node: 1 Node: 44
6
6
7
1
2
3
4
5
2
Procedure
6-12 Load Definition –Definition of Traffic Line Lanes06
5 6
For other lanes, similarly change names,
wheel spacing and eccentricities as
below:
Enter Lane Name “Cl.A1”
Enter Eccentricity “2.45”m
Enter Wheel Spacing “1.8”m
Enter Impact factor “0.1”
Enter Lane Name “Cl.A2”
Enter Eccentricity “-1.05”m
Enter Wheel Spacing “1.8”m
Enter Impact factor “0.1”
4

55. Single Span Prestressed Box Girder Bridge55
StepStep
5
1
2
3
Go to “Load” of Main Menu
Click “Moving Load”
Click “Vehicles”
Click “Add Standard”
Select Standard Name “IRC:6-2000
Standard Load”
Select Vehicular Load Type “Class A”
Click “Apply”
Select Vehicular Load Type “Class
70R”
Click “OK”
Click “Close”
4
3
2
6
7
8
9
10
5
6, 8
9
4
10
7
1Procedure
6-13 Load Definition –Definition of Vehicle06

56. Single Span Prestressed Box Girder Bridge56
StepStep
5
1
2
3
Go to “Load” tab
Click “Moving Load”
Click “Moving Load Cases”
Click “Add ”
Enter Load Case Name “70R”
Uncheck “Auto Live Load
Combination”
Under Sub-Load Cases Click “Add”
Enter Scale Factor “1”
Enter Minimum Loaded Lanes as 0
Enter Maximum Loaded Lanes as 1
Select Vehicle as “Class 70R”
Under List of Lanes Select “70R”
Click on “->”
Click “OK”
4
6
7
6
Note: To take into account of the wheel spacing and minimum clearance for different vehicles, the Auto Live Load Combination
option can be unchecked and manually different moving load combinations can be created for the vehicles as per IRC 6:2000.
9
7
3
2
8
9
4 5
1
8
Procedure
6-14 Load Definition –Definition of Moving Load Cases06

57. Single Span Prestressed Box Girder Bridge57
StepStep
5
1
2
3
Go to “Load” tab
Click “Moving Load”
Click “Moving Load Cases”
Click “Add ”
Enter Load Case Name “Cl.A”
Uncheck “Auto Live Load
Combination”
Under Sub-Load Cases Click “Add”
Enter Scale Factor “1”
Enter Minimum Loaded Lanes as 0
Enter Maximum Loaded Lanes as 2
Select Vehicle as “Class A”
Under List of Lanes Select “Cl.A1
Cl.A2”
Click on “->”
Click “OK”
4
6
7
4
6
9
7
3
2
8
9
Note: To take into account of the wheel spacing and minimum clearance for different vehicles, the Auto Live Load Combination
option can be unchecked and manually different moving load combinations can be created for the vehicles as per IRC 6:2000.
5
1
8
Procedure
6-15 Load Definition –Definition of Moving Load Cases06

58. Single Span Prestressed Box Girder Bridge58
StepStep
5
1
2
3
Go to “Analysis” tab
Click “Moving Load”
Enter Number/Line Elements: 3
Select Analysis Results Frame
“Normal + Concurrent Force/Stress”
Check “Combined Stress Calculation”
Select Bridge Type for Impact
Calculation “RC”
Click “OK”
4
2
3
4
5
6
6
1Procedure
8-1 Analysis Control –Moving Load Analysis Control Data08

59. Single Span Prestressed Box Girder Bridge59
StepStep
1
2
Go to “Analysis” tab
Click “Construction Stage”
Click “Add”
Enter Load Case Name as “SIDL-WC”
Select Load Type for C.S as “Dead
Load of Wearing Surfaces and
Utilities”
From List of Load Case, Select “SIDL
WC” and Click “->”
Click “OK”
Repeat Steps 3 & 4with Load for
load case SIDl-CB, Select Load Type
for C.S as “Dead Load of
Components and Attachments”
Change Beam Section Property
Changes to “Constant”
Check “Save Output of Current Stage”
Click “OK”
3
5
3
5
4
6
6
2
1
4
Procedure
8-2 Analysis Control –CS Analysis Control Data08

60. Single Span Prestressed Box Girder Bridge60
StepStep
2
3
Change units to KN-m.
Go to “Properties” tab
Click “Section manager 
Reinforcements”
Select “Mid section”
Click on “Multi Add”
Enter Reinforcement data in the
tables as shown and click “OK”
Click “Apply”
Repeat the Steps 4 to 6 for all
sections.
2
4
5
6
7
1
1
3
4
5
7
Note:
Incasethediameterofrebarsisnotinterms
ofP(dia),thenchangetherebarmaterialcode
fromToolsPreferencesDesign
ConcreteRebarMaterialCodeSelect
IS(RC)&ClickOK
6
Procedure
9-2 Reinforcement –Assigning Reinforcement to Mid Section09

61. Single Span Prestressed Box Girder Bridge61
StepStep
1
2
Select “Mid section”
Click on “Shear Reinforcement”
Enter Shear Reinforcement data
under “Diagonal Reinforcement” as
Pitch: 0.15m
Angle: 90[deg]
Aw: 0.0012568 m^2 (4Legs of P20)
Enter Torsional Reinforcement data
under “Torsional Reinforcement” as
Pitch: 0.15m
Awt: 0.0003142 m^2 (1Leg of P20)
Alt: 0.008044 m^2(40 Nos. of P16)
Click “Apply”
Repeat the Steps 2 to 5 for all
sections.
Click “Close”
3
1
4
2
5
3
4
7
5
6
*Note:Diameter&numberofrebarscanbeenteredbyclicking…
*
*
*
Procedure
9-3 Reinforcement –Assigning Reinforcement to Mid Section09
7

62. Single Span Prestressed Box Girder Bridge62
StepStep
1
2
Go to “Properties” tab
Click on “Tapered Group”
Go to Tree Menu
Select Mid-Sup& Sup-Midtapered
groups
Click “Convert to Tapered Section…”
New Start Section Number > 6
Click “OK”
3
1
4
2
5
6
7
3
4
5
Procedure
9-1 Reinforcement –Conversion of Tapered Groups To Tapered sections09
7
6

63. Single Span Prestressed Box Girder Bridge63
StepStep
1
2
Go to “Analysis” tab
Click “Perform Analysis”
2
1Procedure
10-1 Analysis –Perform Analysis10

64. Single Span Prestressed Box Girder Bridge64
StepStep
Results > Load Combination >
Concrete Design
Create load combination and enter
factors for load cases as shown in the
tablebelow .
LoadCombination
Temp Temp Grad
Temp Overal
l
MVL
Service LL
Leading
Service Temp
Leading
ULS
Load Cases &
Factor
Temperature Rise(ST) 1 - - - - - -
Temperature fall(ST) 1 - - - - - -
Positive temp Grad(ST) - 1 - - - - -
Negative temp Grad(ST) - 1 - - - - -
Temp(CBC) - - 1 - - -
Temp Grad(CBC) - - 1 - - -
70R(MV) - - - 1 - - -
Cl.A(MV) - - - 1 - - -
Dead Load(CS) - - - - 1 1 1.35
SIDL-WC(CS) - - - - 1 1 1.75
SIDL-CB(CS) - - - - 1 1 1.35
Erection Load 3(CS) - - - - 1 1 1
Tendon Primary(CS) - - - - 0.9 0.9 -
Tendon Secondary(CS) - - - - 0.9 0.9 1
Creep Secondary(CS) - - - - 1 1 1
Shrinkage Secondary(CS) - - - - 1 1 1
MVL(CBC) - - - - 1 0.75 1.5
Temp Overall(CBC) - - - - 0.6 1 -
Procedure
11-1 Results –Load Combinations11
*Note:Theloadcasescanbe
copiedfromonemodeltoanother
byusingtheMCTCommandShell
command*LOADCOMBprovided
theloadarrangementissame.

65. Single Span Prestressed Box Girder Bridge65
StepStep
1
2
Click on “Results” Tab
Select construction stage: CS2 to
view second construction stage
results.
Click on “Forces” “Beam Diagrams”
Go to Tree Menu
Select Load Combination “CS:
Summation”
Select component My
Check on Contour and Legend
Click Apply
1
4
6
5
6
7
7
3
3
Procedure
11-2 Results –Bending Moment Diagram11
2
4
5

66. Single Span Prestressed Box Girder Bridge66
StepStep
1
2
Click on “Results” Tab
Click on “Stresses” “Beam
Stresses Diagram”
Go to Tree Menu
Select Load Combination “CBCmax:
Service LL Leading”
Select location 1(-y,+z)
Click “Apply” and stress contour will
be displayed for the top left corner of
the girder for corresponding load
case.
Select location 4(-y,-z)& Click “Apply”
and stress contour will be displayed
for the bottom left corner of the
girder for corresponding load case.
Change the units to “N-mm”
Check the “Values” option and stress
values will be displayed.
1
2
4
4
5
6
5
6
8
7
7
8
3
3
Procedure
11-2 Results –Beam Stresses Diagram11

67. Single Span Prestressed Box Girder Bridge67
StepStep
1
2
1
2
3
3
Go to “PSC” tab
Select “IRC 112-2011”
Click “Parameters”
PrestressingStrand type > Strands
Click “Select All”
Click “OK”
4
5
6
4
5
6
Procedure
12-1 PSC Design –Design Parameters12

68. Single Span Prestressed Box Girder Bridge68
StepStep
1
2
3
Go to “PSC” tab
Select “PSC Design Material”
Click on Material Name “M50”
Under Concrete Material Selection
Select Code: IS(RC)
Select Grade: M50
Under Rebar Selection
Select Code: IS(RC)
Select Grade of Main Rebar: Fe500
Select Grade of Sub-Rebar: Fe500
Click Modify& Close
4
5
6
1
2
4
3
5
6
Procedure
12-2 PSC Design –Design Material12

69. Single Span Prestressed Box Girder Bridge69
StepStep
1
2
3
Go to “PSC” tab
Click “Design Output Position”
Click “Design Position”
Enter Element Numbers “21 22” in
element selection box to
select elements 21 & 22
Click “Apply”
Click “Output Position” as shown in
Step2.
Repeat Steps 3 & 4
4
5
6
1
2
4
3
Procedure
12-3 PSC Design –Design Position12
*Note:Theelementatwhichthemaximumbendingmomentis
generatedischosentoperformdesignchecks.

70. Single Span Prestressed Box Girder Bridge70
StepStep
1
2
3
Go to “PSC” tab
Select “Serviceability Load
Combination Type”
Select Serviceability load
combinations “Service LL
Loading” & “Service Temp
Loading”
Select -> button to move the selected
combinations under
Characteristic combinations.
Click “OK”
Click “Perform Design”
Click “Excel Report” to get the design
of elements 21 & 22 in excel
sheet format
4
5
5
6
7
1
2
3
4
6 7
Procedure
12-4 PSC Design –Perform Design and Generating the Report12