Beam Connections of steel works at field

steel Connections types

1. CONNECTION
PREPARED BY :
SHAMILAHANUDAI@ANUAR
HTTPS://WWW.SLIDESHARE.NET/BABUNAVEEN/STEEL -CONNECTIONS

2. Types of members joining
Beam to beam connections –Primary beam to secondary beam
connections, beam splice
Column to column connections -column splices use to connect
different size of column sections
Beam to column connections –Fin plates, End plates, web or end
cleats, Hunched connections
Column base plate connections

3. Bolted and Welded connection
Bolted connection
Welded connection

4. Failure in Bolted Connection Design
Failure planes
double shear
Bearing
failure of
plate
material
Failure plane in
single shear
P
P
P
P
P
P
P
P/2
P/2

5. Failure of bolts, plate and connection
Shearing of bolts
Bearing failure of bolts
Bearing failure
of plate
Bearing connection
Friction connection

6. BLOCK SHEAR
Gusset plate

7. BLOCK SHEAR (cont’)
Failure occurs by rupture on the shear area and rupture on the
tension area

8. Block Shear (cont’)

9. Block Shear (cont’)
Shear
Area
Tension
Area

10. Single Shear –A bolted connection in
single shear
P
P
P
P
P
One surface
in shear
F
v
P
P

11. Double shear –A bolted connection in
double shear
P/2
P/2
P/2
P/2
P
P
P
F
v
F
v
Two shear
planes

12. Bearing of a bolt on a bolt hole
Center plate
Projected
Bearing Area
Bearing stress
P
P
The bearing surface can be represented by projecting the cross
section of the bolt hole on a plane ( into a rectangle)

13. Block shear rupture of connection
Failure for block shear
rupture limit state
Block shear rupture in
tension
The limit state for connections depends on the tension, shear,
bearing, bending yielding (due to eccentric loads) and rupture.
•High strength bolts resist shear (primarily),
the connected part must resist yielding and
rupture.
•Weld must resist shear stress. The design
strengths depend on the weld materials.

14. Block Tearing
P
P
End tear
(rupture)
Tearing of
the plate
across the
bolt holes
P
P
P
f
t

15. Welded connection
Longitudinal
Weld
Transverse
Weld
Transverse stress
distribution
Longitudinal
stress distribution
P
P
P
P

16. Example 1:Tension splice –single shear
A lap joint is shown in Figure 1 which a single grade 8.8, 16 mm diameter ordinary bolt connects two
of 10 mm thick S275 plates. There is one shear interface and it is assumed that the bolts is fully
threaded.
a)Check the minimum and maximum edge and end distances by assuming the steel exposed to the
weather or other corrosive influences
b)Check the load capacity of the connection with respect to :-
i. Bolt shear
ii. Bolt bearing
iii. Block tearing
iv. Plate tension capacity

17. Example 2:Tension splice –double shear
In this case, there are two shear interfaces and four 20 mm diameter Grade 8.8 of ordinary bolts as
shown in Figure 2. The outer plates are 8 mm thick, whilst the inner plate is 12 mm thick, all are S275
steel.
a)Check the minimum and maximum edge and end distances by assuming the steel exposed to the
weather or other corrosive influences
a)Check the load capacity of the connection with respect to :-
i. Bolt shear
ii. Bolt bearing
iii. Block tearing
iv. Plate tension capacity

18. Example 2:Tension splice –double shear
(cont.’)

19. Example 3 : Shear resistance of a welded
end plate to beam connection
Figure 3

20. Example 4 : Bolted beam-to-column
connection using an end plate
Abeamsectionisconnectedtotheflangeofacolumn305x305x97UC,asshowninFigure4
below.Thebeamisweldedtoanendplate10mmthicknessandconsequentlytheplateis
boltedtotheflangeofthecolumnusing6bolts20mmdiameter,Grade8.8.
a)Checkpositioningofholesforbolts
b)Determinebearingandshearresistanceofboltgroup
c)Calculatetheresistanceofweldedconnectionbetween
beamandend-plate

21. Example 4 (cont.’)

22. Assignment 2
Figure1showsthebeamlayoutofafloorplanofcarparkbuilding.Allbeamsaresimply
supportedandthesecondarybeamactaslateralrestraintonthemainbeam.Designbeam
2/A-DusingsteelsectionGradeS275.Thedesignfactoredloadingsaregivenasfollows:
Uniformly distributed load on the slab = 8.0 kN/m
2
Uniformly distributed load include its self-weight = 4.0 kN/m
There is a 3.5 m height brick wall on beam B/1-3, its weight (factored) is 4 kN/m
2
.
•Each student should proposed DIFFERENT SIZE OF SECTION, if not mark will divide equally
•Date of submission 23/05/2017 during lecture time.

23. Floor plan
Figure 1