Abstract
In accordance with the philosophy of performance based seismic design (PBSD), the fully operational performance level (or service performance level) for frequently occurring earthquakes and the criteria for determining its allowable drift indices is discussed in this paper. To determine the allowable drift limits of the service performance level for frequently occurring earthquake, it is important that not only the degree of damage of nonstructural members but also the degree of cracking in structural components should be controlled. Based on an analysis of test results and calculation results, a series of allowable drift index limits that conform to the fully operational performance level of RC structures are presented.
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