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2. STEEL
STRUCTURE
•STEEL CONNECTIONS
Presented by:
Moti Ram (16CE69)
Presented to: Prof: Dr. Nafees Ahmed Memon
MEHRAN UNIVERSITY OF ENGINEERING AND
TECHNOLOGY JAMSHORO, SINDH

3. • Introduction to topic
• Components of connections
• Classification
• Advantages Disadvantages
• conclusions

4.  Connections are structural elements used for joining different
members in steel framed structures.
 Steel structure is assemblage of different members such as “beams,
columns” which are connected to each other usually at member ends
that shows one composite unit.

5.  Bolts Connecting Plates

 Weld Connecting Angles

6.  On the Basis of Connecting Medium.
 According to the type of internal
forces.
 According to the type of structural
Elements.
 According to the type of members
joining

7.  Riveted Connections Welded Connections
 Bolted Connections Bolted-Welded Connections

8.  Used for very long time.
 Made up of:
Round Ductile steel bar called shank.
A head at one end
The length of the rivet should sufficient to
form the second head.
 Design - very similar to bearing type of
bolted connection.

9. Heating of the rivet
Inserting it to an oversize hole pressure to the
head.
Squeezing the plain End by Pneumatic driver
Round
head.
On Cooling Reduces in
Length–Clamping Force

11. The introduction of high strength structural bolts.
The labour costs associated with large riveting
crews
The cost involved in careful inspection and
removal of poorly installed rivets.
The high level of noise associated with driving
rivets.
Riveting was a very dangerous and time
consuming process

12.  Bolting is a very common method of fastening
steel members.
 Bolting is particularly cost effective in the field.
 Fastened Together primarily by Bolts.
 Bolts may be loaded in:
• Tension
• Shear
• Both Tension & Shear

13.  Advantages
1. The bolting operation is very silent
2. Bolting is a cold process hence there is no risk of
fire
3. Bolting operation is more quicker than riveting.
4. Less man power is required in making the
connections.
 Disadvantages
1. If subjected to vibratory loads, results in reduction
in
strength get loosened.
2. Unfinished bolts have lesser strength because of
non uniform diameter

14.  whose components are joined together
primarily by welds.

15.  Groove weld(more reliable than others).
 Fillet weld(mostly use weaker than groove and
others).
 Plug(expensive-poor transmission of tensile
forces).
 Slot (expensive-poor transmission of tensile
forces)

17. Advantages
 Economical – Cost of materials and labors.
 Efficiency is 100% as compared to rivets (75- 90%)
 Fabrication of Complex Structures – Easy – like
Circular Steel pipes.
 Provides Rigid Joints – Modern Practice is of Rigid
Joints.
Disadvantages
× No provision for expansion or contraction
therefore
× greater chances of cracking.
× Uneven heating and cooling - member may distort
–may result in additional stresses.
× Inspection is difficult and more costlier than rivet

18.  Most connections are Shop Welded and Field
Bolted types.
 More Cost Effective
 Better Strength &
 Ductility characteristics –Fully welded

19. Shear (semi rigid, simple) connections
 Allows the beam end to rotate without a
significant restraint.
 Transfers shear out of beam
Moment (rigid) connections
Designed to resist both Moment and Shear.
 Often referred - rigid or fully restrained connections
Provide full continuity between the connected members
Designed to carry the full factored moments.
 Principal Reason - buildings has to
resist theeffect of lateral forces.

20. Single plate angle Connections
 A plate is welded to secondary
section (beam)
An Angle is welded to Primary
Section (column or Beam)
Double web angle connections
Two angles welded
After erection the angles are bolted or
site welded to the primary member.
Two angles welded

21.  Top and seated angle connections
 Generally used in case of moment connections.
 Two angles are provided at top and bottom
of the beam to resist moment.
 Generally used for lesser moments where
heavy loads are not acting

22.  Seated beam connection
 Generally used in case of shear connections.
 A seating angle - at bottom of secondary
 beam - shop welded to the primary member.
 Seating angle resists vertical shear coming
 from the beam.

23. Beam to beam connections
Column to column connections (column splices)

24. Beam to Column Connections
Column Base Plate Connection

25. From above discussion we conclude that with the help
of connection we come up with:
 Complex design and digital modelling.
 ease of fabrication and erection
 The desirable structure (any shape we can design).
 Connection are Designed for Seismic Ductility
Demands
 Connections are Designed for Fire Ductility
Demands etc.