高层钢-混凝土混合结构地震反应分析

SEISMIC BEHAVIORS ANALYSIS OF TALL STEEL-CONCRETE BUILDINGS

针对目前高层建筑中常用的外钢框架-内混凝土核心筒混合结构体系的抗震性能实用计算开展研究,利用同济大学MTS多高层钢结构设计系统,根据钢-混凝土混合结构抗震概念设计原理建立计算机模型,采用时程分析法进行地震反应分析,计算输入3种地震波时结构最大楼层位移、最大层间位移角沿楼高的分布曲线。在合理选取一定数量的地震记录及典型结构形式的基础上,经分析得到该建筑物的自振特性。结果表明,结构的最大位移限值、阻尼比、地震波的输入方向等因素对结构的抗震性能均有较大影响。

A research on practical calculation of aseismic behavior for steel exterior frame-concrete interior tube structure widely used in tall ＂building at present in China is established. A computer model is set up based on the theory of concept design of steel-concrete hybrid structure and with the help of the MTS system of Tongji University. Moreover seismic response analysis of a building is carried out adopting time-history method.When introducing three natural earthquake waves, the curves of the maximum displacement of the floor and the displacement-angle between floors are obtained. On the basis of statistical investigation on a class of typical structures subjected to various seismic excitations, the characteristics of free-vibration are obtained. The results show that the maximum of the displacement and damping ratio of the structure, as well as the input direction of the earthquake waves have greater affects on the seismic behaviors.