midas Civil for Beginners_Single Span PSC Box Girder Bridge (1).pdf

Midas for Begineers.

1. Course Overview
midas Civil for Beginners
for Beginners
Let’s Do it

2. Objective
Description
Who can attend?
•New Users
•Beginners
What will I Learn?
•Guided training through Interactive Tutorial
•Basic features & functionalities to Get started
with midas Civil
How to get Certified ?
•Complete Beginners Course
•Submit associated Task for Assessment
•Get Certified on scoring min 80%
Mastering Software: midas Civil
Interactive Tutorial : 2D Portal Frame
PSC Box Girder: Modelling & Analysis

3. Your Instructor
Sindhu Bharathi N J
Software Application Engineer, Midas India
B.Tech Graduate from IIT Madras
H
as 6+ years of extensive Technical Reviewing and Consulting experience
for Bridge & Building Projects.
Equally conversant with RCC, Prestress, Steel and Composite designs.

4. Contents
01
Introduction
Before getting started get introduced to
the capabilities of midas Civil, Software
Installation etc.
02
Mastering Software:
Model Generation in midas Civil
Get used to Graphic User Interface (GUI) of midas Civil related to Model Generation
03
Interactive Tutorial: 2D Portal
Frame Pre Processing
Practice through an interactive tutorial on 2D Portal Frame (Model Generation)
05
Interactive Tutorial: 2D Portal
Frame Post Processing
Practice through an interactive tutorial on 2D Portal Frame (Load, Analysis & Result)
06
Project Application: Single
Span PSC Box Girder Bridge
Video Course on how to Model & Analyze Super Structure of Simple PSC Box Girder
07
Task for Certification
Based on the video course complete the tutorials on Single Span PSC Box along with Q & A for assessment
04
Mastering Software:
Load, Analysis & Result
Get used to Graphic User Interface (GUI) of midas Civil related to Load, Analysis & Result Interpretation

5. •Why Learn midas Civil
•What to Expect from Beginner Course
•midas Civil Installation & License
01.Introduction
midas Civil for Beginners

6. •Windows & Menu
•Preference Setting
•Manipulate Model View
•Selection & Activation
•Model Generation
•Verify Input (1/2)
02.Mastering Software: midas Civil
midas Civil for Beginners

7. •Modelling
03.Interactive Tutorial: 2D Portal Frame
midas Civil for Beginners

8. •Load Definition
•Verify Input (2/2)
•Analysis
•Result Interpretation
•Produce Output
04.Mastering Software: midas Civil
midas Civil for Beginners

9. •Load Definition
•Analysis
•Result Interpretation
05.Interactive Tutorial: 2D Portal Frame
midas Civil for Beginners

10. •Modelling
•Load Definition
•Analysis
06.Project Application: PSC Box
midas Civil for Beginners

11. Overview & Initial
Settings
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

12. 00.Overview
midas Civil for Beginners
•Bridge Type: Single Span PSC box girder
•Span Length: 40m
•Width: 8.5m(7.5mclearcarriageway)
•Design Code: IRC:112:2011
•Time Dependent Material:IRC:112:2011
26.Project Application: Overview & Initial Settings |

13. •Generate PSC box section.
•Define Construction Stages for the given construction sequence
•Simulate Boundary Conditions & Assign Static & Prestress load
•Define Moving load as per IRC:6- 2016
•Interpret the various Results like Stresses
00.Learning Agenda
midas Civil for Beginners
36.Project Application: Overview & Initial Settings |

14. Material & Section
Definition
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

15. 01.Material Definition
midas Civil for Beginners
Concrete: M50 for Girders
Steel: Fe540 for Tendons
•Material Properties
5
•Time Dependent Properties
Concrete: Creep for M50
Shrinkage for M50
Elastic Modulus for M50
6.Project Application: Material & Section Definition|

16. 01.Material Definition
midas Civil for Beginners
•Creep
66.Project Application: Material & Section Definition|

17. 01.Material Definition
midas Civil for Beginners
•Shrinkage
76.Project Application: Material & Section Definition|

18. 01.Material Definition
midas Civil for Beginners
•Elastic Modulus
86.Project Application: Material & Section Definition|

19. 02.Section Definition
midas Civil for Beginners
•Girder Sections
9
PSC Box Girder Mid Section
Top Slab
Bottom Slab
6.Project Application: Material & Section Definition|

20. 02.Section Definition
midas Civil for Beginners
•Girder Sections
10
PSC Box Girder End Section
6.Project Application: Material & Section Definition|

21. 02.Section Definition
midas Civil for Beginners
•Girder Sections
11
PSC Box Girder Diaphragm Section
6.Project Application: Material & Section Definition|

22. midas Civil for Beginners
12
PSC Box Girder Mid Section
HO1
HO2
HO3
BO1
BO1-1
BO2
BO3 = 4.5/2
6.Project Application: Material & Section Definition|
Outer Dimension

23. midas Civil for Beginners
13
PSC Box Girder Mid Section
HI1
HI2
HI3
HI4 HI5
BI1= 4.4/2
BI1-1= 1.4/2
BI2-1= 1.5+ 1.4/2
BI3= 1.232+ 1.4/2
BI3-1= 1.4/2
HI3-1
6.Project Application: Material & Section Definition|
Inner Dimension

24. 02.Section Definition
midas Civil for Beginners (1/2)
•Tapered Girder Section
14
In Fixed support conditions, the end moments and shear are higher than mid span moments
6.Project Application: Material & Section Definition|

25. 02.Section Definition
midas Civil for Beginners
•Tapered Girder Section
15
Taking economy into consideration, engineers tend to reduce section depth at the mid
But the change in section property should not be abrupt, which will induce stress concentrations
6.Project Application: Material & Section Definition|

26. 02.Section Definition
midas Civil for Beginners
•Tapered Girder Section
16
Hence Tapered sections are introduced with gradual change in section property
6.Project Application: Material & Section Definition|

27. 02.Section Definition
midas Civil for Beginners
•Tapered Girder Section
17
Other Software have limitation with defining Tapered Sections
Average of Mid & End section is considered and modelled as uniform Section
6.Project Application: Material & Section Definition|

28. 02.Section Definition
midas Civil for Beginners
•Tapered Girder Section
18
Conveniently Define Tapered Section in midas Civil in two easy steps
1)Define Tapered Section
2)Assign Tapered Group
1
2
6.Project Application: Material & Section Definition|

29. Geometric
Modelling
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

30. 03.Geometric Modelling
midas Civil for Beginners
206.Project Application: Geometric Modelling|

31. midas Civil for Beginners
Crash Barrier /
Precast Panels
Box Girder
Elastomeric Bearing
Pedestal
Pier
Cap
Pier
Pile Cap
Pile
C/C of Deck
PSC Box Girder Supported on Piers
03.Geometric Modelling
21
Wearing Course
6.Project Application: Geometric Modelling|

32. midas Civil for Beginners
Crash Barrier /
Precast Panels
Box Girder
Elastomeric Bearing
Pedestal
Pier
Cap
Pier
Pile Cap
Pile
C/C of Deck
C/C of Deck
PSC Box Girder Supported on Piers
03.Geometric Modelling
22
Simplified Model for Analysis
Wearing Course
6.Project Application: Geometric Modelling|

33. midas Civil for Beginners (1/2)
Crash Barrier /
Precast Panels
Box Girder
Elastomeric Bearing
Pedestal
Pier
Cap
Pier
Pile Cap
Pile
C/C of Deck
C/C of Deck
PSC Box Girder Supported on Piers
03.Geometric Modelling
23
Simplified Model for Analysis
Wearing Course
Analytical Model from Software Analysis
6.Project Application: Geometric Modelling|

34. midas Civil for Beginners
03.Geometric Modelling
24
•Analytical Model for Software Analysis
6.Project Application: Geometric Modelling|
Node
Element
Rigid Link
Elastic Link
Support

35. midas Civil for Beginners
03.Geometric Modelling
25
•Analytical Model for Software Analysis
1.9 m
3 m
0.1 m
6.Project Application: Geometric Modelling|

36. Group Definition
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

37. midas Civil for Beginners
04.Group Definition
27
•Structure Group
•Load Group
•Boundary Group
•Tendon Group
Important for Defining Construction Stage, else not required
In Grillage model, for Moving Load Lane Definition
6.Project Application: Group Definition
|

38. Boundary
Definition
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

39. •Rigid Link
•Elastic Link
•Supports
29
05.Boundary Definition
midas Civil for Beginners
Rigid Link
Elastic Link
Supports
Rigid Links: Establish Load Path, without need to model dummy elements, with stiffness property
Elastic Links: Most common use is to simulate bearing, however has variety of applications
Supports: When a node has to be restrained of movement in any particular DOF
6.Project Application: Boundary Definition
|

40. 05.Boundary Definition
midas Civil for Beginners
30
Without Diaphragm With Diaphragm
Rigid Diaphragm Provided at Bearing Location
1)The Rigidity offered by Diaphragm, enables equal distribution of loads from deck to bearings
2)Hence can be idealised with Rigid Link for Load Transfer Path.
•Rigid End Diaphragm
6.Project Application: Boundary Definition|

41. 05.Boundary Definition
midas Civil for Beginners
30
Without Diaphragm With Diaphragm
Rigid Diaphragm Provided at Bearing Location
1)The Rigidity offered by Diaphragm, enables equal distribution of loads from deck to bearings
2)Hence can be idealised with Rigid Link for Load Transfer Path.
•Rigid End Diaphragm
6.Project Application: Boundary Definition|

42. •Need for Bearings
31
05.Boundary Definition
midas Civil for Beginners
Reaction Force
Deformation
F1
x
x
F1
No Bearing
x
F2
F2
With Rubber
Bearing
Deck
Pier
6.Project Application: Boundary Definition|
F = kx

43. 32
05.Boundary Definition
A
A
M
M
R
R
Vertical Load Rotation Horizontal Displacement
midas Civil for Beginners
•Bearings Stiffness
Stiffness (SDx) Stiffness (SRx) Stiffness (SDy)
(SRy)
(SRz)
(SDz)
6.Project Application: Boundary Definition|

44. 33
05.Boundary Definition
midas Civil for Beginners
•Bearings Stiffness
Restrained: Stiffness = 10e6 kN/m
Not Restrained: Stiffness = 10 kN/m
6.Project Application: Boundary Definition
|

45. 34
05.Boundary Definition
midas Civil for Beginners
•Bearings Stiffness
Restrained: Stiffness = 10e6 kN/m
Not Restrained: Stiffness = 10 kN/m
z
y
SDx= 10e6
SDy= 10e6
SDz= 10e6
SRx= SRy= SRz= 10
SDx= 10e6
SDy= 10
SDz= 10
SRx= SRy= SRz= 10
SDx= 10e6
SDy= 10e6
SDz= 10
SRx= SRy= SRz= 10
SDx= 10e6
SDy= 10
SDz= 10e6
SRx= SRy= SRz= 10
6.Project Application: Boundary Definition
|

46. Load Definition
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

47. 37
06.Load Definition
midas Civil for Beginners
6.Project Application: Load Definition|

48. 38
06.Load Definition
midas Civil for Beginners
•Static Load
•Prestress Load
•Temperature Load
•Moving Load
6.Project Application: Load Definition|

49. 39
06.Load Definition
midas Civil for Beginners
•Static Load
•Self Weight
•Superimposed Dead Load
•Wearing Course
•Crash Barrier / Parapet
Self Weight
Crash Barrier
Wearing Course
Self Weight:
Density x Area (kN/m)
= 25 x (Area obtained from Section Property)
Wearing Course:
Density x Carriage way width x Thickness (kN/m)
= 22 x 7.5 x 0.1 = 16.5 kN/m
Crash Barrier:
Density x Area (kN/m)
= 25 x 1 x 0.3 = 7.5 (kN/m)
6.Project Application: Load Definition|

50. 40
06.Load Definition
midas Civil for Beginners
•Prestress Load
•Tendon Material
•Tendon Profile
•Tendon Prestress Load
6.Project Application: Load Definition|

51. 41
06.Load Definition
midas Civil for Beginners
•Prestress Load
•Tendon Material
•Type: Post – Tension
•Tendon Area: 15.2mm (19) = 0.0026353 m
2
•Duct Diameter: 0.11 m
•Relaxation Coefficient: Low
•UTS: 1860 MPa
•Yield Strength: 1581 Mpa
•Curvature Friction Factor:0.17
•Wobble Friction Factor: 0.002 1/m
•Bonded
•Anchorage Slip( Begin & End):0.006m
6.Project Application: Load Definition|

52. 42
06.Load Definition
midas Civil for Beginners
•Prestress Load
•Tendon Profile
6.Project Application: Load Definition|

53. 43
06.Load Definition
midas Civil for Beginners
•Prestress Load
•Tendon Profile
6.Project Application: Load Definition|

54. 44
06.Load Definition
midas Civil for Beginners
•Prestress Load
•Tendon Prestress Load
6.Project Application: Load Definition|

55. Construction Stage
Definition
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

56. •Steps to Define Construction Stage
•Define Groups
•Structure Group
•Load Group
•Boundary Group
•Assign Elements
•Define Construction Stages
•Activate / Deactivate Groups
•Construction Stage Analysis Control
46
07.Construction Stage Analysis
midas Civil for Beginners
6.Project Application: Construction Stage Definition|

57. •Steps to Define Construction Stage
•Define Groups
•Structure Group
•Load Group
•Boundary Group
•Assign Elements
•Define Construction Stages
•Activate / Deactivate Groups
•Construction Stage Analysis Control
47
07.Construction Stage Analysis
midas Civil for Beginners
Duration of Each Stage
Age of Structure group at time of activation
Structure, Boundary & Load for each stage
Intermediate Steps, if any
6.Project Application: Construction Stage Definition
|

58. 48
07.Construction Stage Analysis
6.Project Application: Construction Stage Definition|

59. Temperature Load
Definition
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

60. •Uniform Temperature
•Rise
•Fall
•Temperature Gradient
•Positive
•Negative
50
08.Temperature Load
midas Civil for Beginners
Causes Axial Expansion or Contraction, if restrained longitudinally
Differential temperature at Top & Bottom Slab, causes Moment & Shear
6.Project Application: Temperature Load Definition
|

61. •Uniform Temperature
•Max
51
08.Temperature Load
midas Civil for Beginners
•Min
6.Project Application: Temperature Load Definition|

62. •Uniform Temperature
•Max
52
08.Temperature Load
midas Civil for Beginners
•Min
40
10
6.Project Application: Temperature Load Definition|
*Note: 40
o
C is taken for explanatory purpose, the value has to
be interpolated from isotherms
*Note: 10
o
C is taken for explanatory purpose, the value has to
be interpolated from isotherms

63. •Uniform Temperature
•Max = 40
o
C
53
08.Temperature Load
midas Civil for Beginners
•Min=10
o
C
6.Project Application: Temperature Load Definition|
(40+10)/2 = 25+10 | 25- 10 = 35
o
C | 15
o
C ( These would be the datum values )
Rise in bridge temperature = 15
o
C to 40
o
C =25
o
C
Fall in bridge temperature = 35
o
Cto 10
o
C = -25
o
C

64. •Uniform Temperature
•Max = 40
o
C
54
08.Temperature Load
midas Civil for Beginners
•Min=10
o
C
(40+10)/2 = 25+10 | 25- 10 = 35
o
C | 15
o
C ( These would be the datum values )
Rise in bridge temperature = 15
o
C to 40
o
C =25
o
C
Fall in bridge temperature = 35
o
Cto 10
o
C = -25
o
C
6.Project Application: Temperature Load Definition
|

65. •Temperature Gradient
•Positive
55
08.Temperature Load
midas Civil for Beginners
•Negative
(IRC 6: 2016)
6.Project Application: Temperature Load Definition|

66. •Example
•Positive Temperature Gradient
56
08.Temperature Load
midas Civil for Beginners
h1 = 0.3*h < 0.15
h2 = 0.10 < 0.3*h < 0.25
h2 = 0.3*h < 0.15
H = 0
H = 0.15
H = 0.4
H = 2.85
H = 3
T = 17.8
T = 4
T = 0
T = 0
T = 2.1
6.Project Application: Temperature Load Definition|

67. •Example
•Positive Temperature Gradient
56
08.Temperature Load
midas Civil for Beginners
h1 = 0.3*h < 0.15
h2 = 0.10 < 0.3*h < 0.25
h2 = 0.3*h < 0.15
H = 0
H = 0.15
H = 0.4
H = 2.85
H = 3
T = 17.8
T = 4
T = 0
T = 0
T = 2.1
6.Project Application: Temperature Load Definition|

68. •Example
•Positive Temperature Gradient
57
08.Temperature Load
midas Civil for Beginners
It is also important to consider the change in Breadth
However midas Civil Considers automatically from Section Property
definition
6.Project Application: Temperature Load Definition|

69. Moving Load
Definition
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

70. •Decide Number of Lanes based on Carriage width
•Vehicles to be loaded
•Lane Position
•Moving Load Case
59
09.Moving Load Definition
midas Civil for Beginners
6.Project Application: Moving Load Definition|

71. •Decide Number of Lanes based on Carriage width
•For CW < 9.6m: 2 Lanes
60
09.Moving Load Definition
midas Civil for Beginners
6.Project Application: Moving Load Definition|

72. •Vehicles to be loaded
•70 R
•Class A
61
09.Moving Load Definition
midas Civil for Beginners
6.Project Application: Moving Load Definition|

73. •Lane Position
•1 Lane of 70 R
•2 Lane of Class A
62
09.Moving Load Definition
midas Civil for Beginners
6.Project Application: Moving Load Definition|

74. 63
09.Moving Load Definition
midas Civil for Beginners
•Example
•2 Lane of Class A 1.8
5.3
0.5
4.25
6.Project Application: Moving Load Definition|

75. 64
09.Moving Load Definition
midas Civil for Beginners
•Example
•2 Lane of Class A
From C/c of Deck, e for
Lane 1: 4.25 – (0.5+0.15+ (0.5/2)+(1.8/2)) =2.45 m
Lane 2: 4.25 –(0.5+0.15+ (0.5/2)+1.8+ (0.5/2)+1.2+(0.5/2)+(1.8/2)) =-1.05 m
1.8
5.3
0.5
2.45
-1.05
4.25
6.Project Application: Moving Load Definition|

76. •Moving Load Case
•70R Lane 70 R
•Cl. A 1 Class A
•Cl. A 2 Class A
•Cl. A1 & A2  Class A
65
09.Moving Load Definition
midas Civil for Beginners
6.Project Application: Moving Load Definition|

77. Analysis Control
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

78. Defining
Reinforcement
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

79. 68
10.Reinforcement Input
midas Civil for Beginners
•Reinforcement
•Longitudinal (Bending)
•Transverse
•Shear
•Torsion
Reinforcement Detail (Simplified) for midas Civil Input
6.Project Application: Defining Reinforcement|

80. 69
10.Defining Reinforcement
midas Civil for Beginners
Reinforcement in Longitudinal Direction
•Reinforcement
•Longitudinal (Bending)
#33 P20 c/c 0.25m
#19 P16 c/c 0.25m
Cover 0.060m
Cover 0.060m
6.Project Application: Defining Reinforcement|

81. 70
10.Defining Reinforcement
midas Civil for Beginners
Reinforcement Shear
•Reinforcement
•Shear
4 Legs P20
6.Project Application: Defining Reinforcement|

82. 71
10.Defining Reinforcement
midas Civil for Beginners
•Reinforcement
•Shear
Pitch = 0.15 m
Reinforcement Shear
6.Project Application: Defining Reinforcement|

83. 72
10.Defining Reinforcement
midas Civil for Beginners
Reinforcement Torsion (Awt)
•Reinforcement
•Torsion (Awt)
1 Leg P20 (Area of one leg of outermost closed stirrups)
6.Project Application: Defining Reinforcement|

84. 73
10.Defining Reinforcement
midas Civil for Beginners
Reinforcement Torsion (Alt)
•Reinforcement
•Torsion (Alt)
#40 –P16 ( Total area reinforcement distributed around
the perimeter of the closed stirrups
)
6.Project Application: Defining Reinforcement|

85. 74
10.Defining Reinforcement
midas Civil for Beginners
•Reinforcement for Tapered Sections
•Convert Tapered Group to individual tapered sections
To convert to
individual tapered
sections
6.Project Application: Defining Reinforcement|

86. 75
10.Defining Reinforcement
midas Civil for Beginners
•Reinforcement for Tapered Sections
•Convert Tapered Group to individual tapered sections
•Define reinforcement separately for I & J end
Uncheck
6.Project Application: Defining Reinforcement|

87. Analysis & Result
midas Civil for Beginners
Project Application
Single Span PSC Box Girder

88. midas Civil for Beginners
Engineer’s
Judgement
Software
as Tool
Software
Usage with
Engineering
Judgement
Point to Remember