Comparison between seismic demand models and incremental dynamic analysis for low-rise and mid-rise reinforced concrete buildings
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abstract
This paper compares a seismic demand model and incremental dynamic analysis (IDA) for low-rise and mid-rise reinforced concrete building structures. A seismic demand model is one of the essential inputs for seismic fragility analysis. Seismic fragility analysis can be used to assess the vulnerability of structures under earthquake events. It plays an important role in estimating seismic losses and in the decision making process of hazard mitigation planning. Accurate estimates of seismic demands can reduce the uncertainty in seismic vulnerability assessment and loss estimation. IDA is an analysis method used to describe a wide range of structural behaviors under seismic loads. IDA is based on multiple nonlinear dynamic analyses using one or more scaled ground motion records. Through this method, one or more curves of structural responses corresponding to multiple levels of intensity can be developed. The theoretical limitations of IDA are discussed and the results of IDAs on 2-story and 5-story RC flat slab example buildings with one selected ground motion record are compared with the results from seismic demand models already available for these structures. In addition, the IDA curves are compared with traditional push-over curves and the dynamic analysis results using unscaled synthetic ground motions, and the transition points in the demand models are compared with those in the push-over curves.
