Connections in steel structure

Presentation by: Abid QayumReg. no: SU-13-01-079-008Sarhad University of Science and Information Technology (Peshawar)

It always seems impossible until its done.

We have two ears and one mouth so that we can listen twice as much as we speak.

Nelson Mandela Epictetus

Introduction 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.

Components of connections

Bolt

Weld

Connecting plates

Connecting angles

Classifications of connections

Riveted connections

Bolted connections

Welded connections

Riveted connections Used for very long time.

Made up of: Round ductile steel bar called shank having head at one end. The length of the rivet should be sufficient to

form the second head.

Installation Heating of the rivet.

Insert the rivet from one end. Squeezing the plain end by pneumatic driver

round head.

Bolted connection Fastened together primarily by bolts.

Bolts may be loaded in: Tension Shear Both Tension and Shear

The bolting operation is very silent.

Bolting is cold process hence there is no risk of fire.

Bolting operation is more quicker than riveting.

Less man power is required in making the connections.

If subjected to vibratory loads, results in reduction in strength get loosened.

Unfinished bolts have lesser strength because of non uniform diameter.

Advantages Disadvantages

Welded connection Whose composite are primarily joined by

weld. Welding Notations were developed by American

Welding Society AWS.

Types of weld 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).

It’s economical. Provide rigid joints. Efficiency is 100 %

as compared to rivets.

No provision for expansion and contraction therefore greater chances of cracking.

Uneven heating and cooling- member may distort –may result in additional stresses.

Advantages Disadvantages

Henry petroski

• Science is about knowing; engineering is about doing.

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