北海机场新航站大楼网壳屋盖结构的地震反应分析

在介绍北海机场新航站大楼工程概况基础上，用有限元法分析其网壳结构的动力反应，用子空间迭代法分析其网壳结构的振动规律和动力特性，用时程分析法和反应谱法分析其网壳结构的地震反应。得出北海机场新航站大楼网壳结构的振型主要是水平的，呈对称和反对称，高阶不规则振型比较复杂，自振频率频谱稍密，周期性不明显；最大内力杆件出现在拱脚附近，位移最大的杆件是刚度较小的次拱上；地震反应主要受水平方向控制，其中又以侧向刚度较小的Y方向为主，竖向地震反应相对很小。

Seismic Sesponse Analysis of Net Shell Roof Structure of New Building of Beihai Airdrome

Dynamic response is analyzed by the finite element method on the net shell of a main part project of Beihai Airdrome,and the law and dynamic characteristic of this structure are also analyzed by subspace iteration method The seismic response of the dome is obtained by means of the spectrum method and time history method Our conclusions are:the main vibrations of the net shell of main part project of Beihai Airdrome are horizontal,symmetrical and anti symmetrical;higher and irregular vibrations are complicated;the spectrum of natural vibration frequencies is dense and its periodicity is inconspicuous;the member of maximal internal force is at the foot of the shell and the maximal displacement is at minor arch of less rigidity;seismic response is mainly excited in horizontal direction especially the side direction of less rigidity;and vertical seismic response is minor