Abstract

The use of capacity design method (CDM) in steel plate shear wall (SPSW) structures results in large vertical boundary elements (VBEs). One way to reduce the force demands on VBEs is to employ outrigger beams in the adjacent spans of SPSW. In this paper, twelve dual SPSW-moment resisting frames are designed and analyzed by FE method to investigate the effects of outrigger system on the behavior of SPSW structures. Results show that outrigger beams can transfer considerable amount of axial force and bending moment from VBEs to the outer spans columns; resulting in smaller sections for VBEs. In addition, the most effective stories to employ outrigger beams are shown to be the stories which undergo larger drifts. Outrigger system also results in a more uniform distribution of structural stiffness along the height of SPSW frames. Furthermore, a design procedure based on the direct analysis method is proposed for the design of SPSW-Outrigger system. The procedure eliminates the excessive capacities in CDM, while satisfying all CDM requirements.

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