Evaluation of Inelastic Response for High Rise Buildings by Equal Seismic Displacement Principle

Abstract eng:
The evaluation of inelastic response for high rise buildings is the one of key problems in the study of earthquake resistance of buildings. In this paper the main problems in modeling inelastic seismic response of high rise buildings are briefly summarized. The feasibility of using equal seismic displacement principle (seismic displacement responses are nearly equal between long period elastic and inelastic systems) to evaluate displacement response of inelastic system is described based on the summarization of the research results concerning the relation between elastic and inelastic responses of SDF system. And then the relationship between the elastic and inelastic seismic displacement responses of high rise buildings is studied by elastic and inelastic time history response analyses respectively. The results show that the average top drifts of inelastic response under different earthquake excitations are nearly equal to those of elastic responses and basically follow the equal seismic displacement principle. The situation is the same for average inter story drifts of inelastic response in weak and middle nonlinear stages, but in large nonlinear stage they are larger than those of elastic responses and modified formula is provided for evaluation of inelastic inter story drifts based on elastic inter story drifts.

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