超长钢屋盖多维多点输入的地震响应分析

Seismic response analysis of a super-long steel roof under multi-dimension and multi-support excitation

采用时程分析法对某超长钢屋盖进行了考虑行波效应的多维多点输入下的地震响应分析,考察了多维多点输入对结构的基底剪力、扭转效应和构件内力的影响,探讨了结构地震响应规律与地震波传播速度的关系。研究结果表明：随着地震波传播速度的减小,多维多点输入下结构的基底剪力逐渐减小而扭转效应逐渐增大;不同类型的钢屋盖构件受多维多点输入影响程度不同,其中纵向桁架弦杆的响应最大,横向桁架弦杆的响应最小。不同类型构件的行波效应影响系数主要分布在1.17-1.51之间。

Time-history seismic analysis of a super-long steel roof structure is carried out considering traveling wave effect under multi-dimension and multi-support excitation. The effect of multi-dimension and multi-support excitation was investigated on the total base shear force,torsion effect and internal force of steel members. The relationship between seismic response of the structure and seismic wave velocity was discussed. The research results show that under multidimension and multi-support excitation,the total base shear force decreases,but the torsion effect increases,as the travelling wave velocity becomes slow. Multi-dimension and multi-support excitation has different influence on different types of structural members in the steel roof. The response of the chords in the longitudinal truss is the largest while the response of the chords in the lateral truss is the smallest. The traveling wave effect coefficients of the different types of members are mainly between 1. 17 and 1. 51.