大跨度钢网壳抗震性能分析

An Analysis of the Seismic Performance of Long-span Steel Reticulated Shells

长沙洋湖卓伯根商业综合体项目是由方钢管焊接形成的双曲面网壳结构,工程应用中各个杆件处于复杂应力状态下,文章重点研究该网壳结构在实际工程应用中的抗震性能,通过有限元分析软件对双曲面空间网壳进行足尺模拟,对结构进行模态分析,并研究了网壳结构在各方向地震作用下的动力响应及杆件受力。得出结论:结构的自振频率随模态阶数的增加分布密集,主要振型以竖向振动为主且对称分布;受力过程中产生的位移主要为竖向位移,水平方向的位移相对较小,且结构竖向位移由四周向中间逐渐变大,中心位移值最大;在地震作用下,结构两端的支撑反力最大;且网壳结构中杆件主要承受轴力,承受的剪力和弯矩值较小。总结可得,结构能达到抗震设防水准要求。

Changsha Yanghu Zhuobogen Commercial Complex Project is a hyperboloid reticulated shell structure formed by square steel pipe welding.In engineering application,each member is in a complex stress state.This paper focuses on the seismic performance of the reticulated shell structure in practical engineering application.The finite element analysis software is used to simulate the hyperboloid space reticulated shell and analyze the modal of the structure.The dynamic response and member force of reticulated shell structure under earthquake action in all directions are studied.It is concluded that the natural frequency of the structure is densely distributed with the increase of modal order,and the main vibration modes are mainly vertical vibration and symmetrical distribution,and the displacement in the horizontal direction is relatively small,and the vertical displacement of the structure increases gradually from all around to the middle,and the central displacement is the largest;under the action of earthquake,the bracing reaction force at both ends of the structure is the largest.In the reticulated shell structure,the members mainly bear the axial force,and the shear force and bending moment are small.In summary,the structure can meet the requirements of seismic fortification level.