张相勇
    （北京市建筑设计研究院，北京 100045）

[摘要] 大跨空间结构受到的地震作用是多点多维的，结构受力情况十分复杂。首先介绍了多点多维输入地震反应分析的基本原理，采用时程分析法对合肥南站大跨空间结构进行多点多维输入下的地震响应分析，并与一致输入下的结构响应进行了对比，考查了两种输入方法下结构扭转效应和内力变化的特点，并进行了对比分析，最后得到结论：对于大跨结构，多点输入带来的影响是比较大的；在不同方向地震输入下，多点输入下结构的扭转效应和内力变化相比一致输入下的扭转效应和内力变化，有的增大，有的减小；多点输入影响较大构件一般为边柱、角柱；且多点输入的影响随着楼层的升高而减小。
[关键词] 多点多维输入；一致输入；空间结构；地震响应；时程分析法
中图分类号：TU311.3    文献标识码：A  文章编号：1002-848X(2011) Sl-0216-04

Dynamic response of Hefei South Station under the multi-support and multi-dimensional excitation
    Zhang Xiangyong
    ( Beijing Institute of Arclutectural Design, Beijing 100045, China)

Abstract: Large-span spatial structure by the earthquake is more multidimensional,and the structure stress is very complicated. The basic principles of seismic response analysis method under multi-support and multi-dimensional excitation were introduced. The dynanuc seisrmc responses of Hefei South Station subjected to multi-support and multi-dimensional excitation as well as to simple-support excitation were thoroughly analyzed based on time lustory analysis method. The characteristics of torsion effect and stress change under these two kinds of earthquake motions were studied and compared. The conclusions show that for large-span spatial structures, the impact of multi-point excitation is relatively large. The seismic input in different directions, the effects of torsion and stress by the multi-support excitation compared to the simple-suppmt excitation reveal some increases and some decreases; side columns and comer columns are generally influenced by multi-suppmt excitation, and the impact of multi-support excitation decreases with the increase of floor.
Keywords: multi-support and multi-dimensional excitation;  simple-support excitation;  lattice structures;  seismic response; time lustory response analysis