Seismic Assessment of High-Rise Buildings

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Abstract
A method is presented by which the seismic resistance of a structure can be assessed and which leads to results with a rather high level of confidence. It is based on the notion of the critical excitation of a structure. This is an excitation that drives one of the structural design variables to a larger response peak than any other, in some given set of credible excitations. Evidence is presented which shows that it is possible to reduce the idea to a method with considerable promise for application in practice, but that substantial modifications are necessary in it. The evidence consists of the results of analyses of four high-rise buildings, three in existence and one in the planning stage. The results show that the method leads to designs that are somewhat conservative, but that appear to be consistent with established good engineering practice. Its application therefore seems most appealing to structures that are sufficiently important to demand high confidence in their survival or integrity during an earthquake.

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