Study on the attenuation of inelastic response spectra;

In this paper,some problems of calculating the inelastic response spectrum are discussed(the form of equation of motion,the selection of spectrum parameters,the method for dealing with the critical points on restoring force models and the technique for time.

In view of many limitations in evaluating elasto-plastic deformations of structures by using elastic response spectrum in aseismatic design code for buildings,this paper proposes that elasto-plastic responses of structures under the action of exceptionally serious earthquakes are directly calculated by applying elasto-plastic response spectrum.

In view of many limitations in evaluating elasto-plastic deformations of structures by using elastic response spectrum in aseismatic design code for buildings,this paper proposes that elasto-plastic responses of structures under the action of exceptionally serious earthquakes are directly calculated by applying elasto-plastic response spectrum.

The target displacement of each mode in pushover analysis can be obtained with inelastic spectrums.

The principles of establishing the inelastic spectrum by means of force reduction factor R and ductility factor μ are elaborated.

Based on the basic theories of capacity spectrum method,the principles of establishing the inelastic spectrum by the relationship of strength reduction factor R and displacement ductility factor μ are elaborated.

The method is illustrated by a four-story RC frame structure with the varying ductility and displacement demands,combining the elastic-plastic response spectrum of the existing seismic code of China.

Strength demand spectrum and ductility demand spectrum are two kinds of elastic-plastic response spectrum.