复杂结构的弹性地震反应的分析

Elastic Earthquake Analysis for Complex Structures

目前使用的反应谱振型叠加法在分析复杂结构的地震反应时,可能引起很大误差。本文提出了一种新的计算处理方法,不论对简单还是复杂结构,只要任取2个不同的地震输入方向,仅增加少量的计算工作量,即可得到结构中任一点或截面上的最大应力或内力,且该方法能很方便地加入到现有计算程序中。还首次提出了结构抗震主轴的概念,定义了结构整体设计合理系数以及结构能质比,为从宏观上比较同一结构在不同方向以及不同结构之间的抗震性能提供了客观依据。

Great errors may be caused by using modal superposition method based on response spectrum theory to analyse complex structures under elastic earthquake actions.A new procedure for complex structural earthquake anal- ysis presented in this paper can evaluate the maximum stress or internal force at any point or cross section within a structure only by increasing little computer time and incorporate easily into the existing computer program. According to the energy absorbed by structures under earthquake,a concept of principal axis of structure resistant to earthquake is put forward and some coefficients are defined,which can be used to check if the structure is well designed and compare the capability of resisting earthquake among different structures.