Abstract

A modal analysis procedure is presented for the seismic response of belted high-rise building structures within the framework of the response spectrum technique. The first 3-modes of vibration are considered. Natural periods, internal forces and deflections are computed, and design charts are presented for the parameters of interest. Based on Applied Technology Council tentative seismic provisions, a numerical example is worked out to illustrate the use of the charts, and a comparison is made with the ATC equivalent lateral force procedure. The contribution of higher modes of vibration is shown to be very sensitive to small changes in the belt-truss location. It is also shown that the ATC parabolic force distribution is likely to overestimate the top deflection and the moment related response values.

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