大跨度钢结构的地震波行波效应

Seismic traveling wave effect of large span steel structures

研究地震波的行波效应对大跨度双跨钢结构的影响,可以从理论上解决实际工程问题。根据大质量法原理,建立考虑行波效应的大跨度结构分析模型以及解析方程。结合大跨度钢结构厂房工程实际,对其进行考虑行波效应的多点激励分析,并与传统一致激励下结构的地震响应进行对比。结果表明:两种地震波输入方式所得钢结构厂房梁柱节点加速度响应曲线一致;在考虑行波效应的多点激励方式作用下,厂房钢结构梁柱节点位移、速度以及加速度响应均有不同程度的增大,且随着地震波传播速度的减小而增大。在大跨度结构的抗震分析中,为得到更精确的结果,应当考虑行波效应对结构的影响。

This paper is driven by the recognition that the study of the effect of traveling seismic wave on the large-pan double-pan steel structure holds a theoretical solution to practical engineering problems. The study builds on using great quality principle to establish large-span structure analysis model and analytic equation which considers traveling wave effect; subjecting large-span steel structure workshops to a multi-point excitation analysis considering traveling wave effect, as is determined by what occurs with these workshops; performing a contrastive study of conventional seismic response under consistent excitation. The results show that two methods used to input seismic wave produce a consistent acceleration response curve of beam-column joints of steel structure workshops; the workshop steel structures have varying degrees of increase in displacement, velocity, and acceleration response of beam-column nodes, which occurs due to the action of muhipoint excitation considering traveling wave effect and the decrease in the seismic wave propagation velocity. It follows that a greater accuracy in the seismic analysis of longspan structures necessitates the due consideration of the impact of the traveling wave effect on structures.