It is similar to bolt seat connection but welding is used for fastening rather than bolts. So, these stresses are required to be considered.Ĭlearly, part of the welding is carried out in the field which is challenging since it is difficult to achieve high quality weld due to movements of steel members caused by winds or other factors. The weld of the connection is subjected to direct shear stress and stress caused by loads on the beam that affect weld pattern. Like other two types of beam connections, various sizes of welded framed connections with their capacities are available and provided by codes. Added to that, bolted connections can be erected with great ease. Bolted connections are desired from environmental point of view because the structure can be dismantled and elements can be used in other projects. It is worth mentioning that this type of connection does not need considerable shop detailing. The function of the top angle used in seat connection is to prevent the beam to suffer from accidental rotations. The most outstanding advantage of seat connection is that the beam can be fabricated economically and seat would provide immediate support during erection. If the reactions at the end of the beam is large, then it is recommended to consider stiffened seat connections because it has adequate capacity to resist large forces whereas the capacity of unstiffened seat connection is restricted due to limited bending capacity of seat angle leg that stick out horizontally. There are two major types of bolted seated connections including unstiffened bolted seat connections and stiffened bolted seat connection as illustrated in Figure-4 and Figure-5.įig.4: Unstiffened Bolted Seat Connection It is recommended to use minimum connection sufficient to withstand the applied load to make the design as economical as possible. The purpose of such standardized connection is to increase the speed of the design. There are various standard sizes of bolted framed connections along with their capacity provided by codes. This measure is specified to ensure sufficient stiffness and stability. The minimum length of connection angle should be at least half of the beam clear web depth. It is required to take strength, type and size of fasteners and strength of base materials into consideration while the connection is designed. In this type of connection, steel beams are linked to supporting elements whether it is steel girders or columns with web connection angle as seen in Figure-3.įig.3: Bolted Framed Steel Beam ConnectionĬommonly, the connection is designed based on the loads at the end of the beam. Simple, rigid and semi-rigid connections.Various types of beam connections are provided below:
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