Abstract
Considering that traditional increment dynamic analysis (IDA) is computational intensive and time-consuming, a simplified IDA method is presented firstly, in which the assumption of equivalent single degree of freedom (SDOF) system is combined with the method of Pushover analysis. On this basis, a simplified IDA based seismic evaluation method of structures is presented, in which the structural capacity curves can be established by using the simplified IDA, and whether the seismic capacity of a structure meets the requirement of seismic fortification levels can be evaluated. In order to verify the proposed method, three structural models are designed according to different soil sites, and typical earthquake records are selected as the horizontal ground motion excitation. The implement of the seismic evaluation for the examples show that the method of seismic performance evaluation method based on simplified IDA is easy to operate, and the result of seismic evaluation is conservative.KeywordsIncrement dynamic analysisSingle degree of freedom systemSeismic fortification levelSeismic performance evaluationStory drift ratio
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