Lateral Load Analysis for Buildings with Setback

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Abstract
A simple method to obtain the load distribution on the resisting elements of symmetric and eccentric setback structures subjected to lateral loading is presented. The compatible load concept is employed by the proposed method to subdivide the loading into load components, both translational and torsional. The proportional stiffness rule of force distribution can then be applied to each load component. In addition to being a practical design tool, the proposed procedure also provides an understanding of the load transfer mechanism involved in setback structures, especially in the region where the setback occurs and complication in behavior is expected. Three numerical examples are presented to illustrate the procedure and provide an insight on the load distribution pattern of such structures.

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