大跨结构多维多点输入抗震研究进展

对于大跨度结构来说,应该考虑地震动的多维多点效应。从国内外发展现状及取得的主要研究进展和近期的发展动向等角度,对大跨度结构多维多点输入抗震的研究现状进行了系统的综述和总结。首先论述了多维地震动及其相关性,从地震动的各个分量之间的强度比、频率、持时及相关性等方面说明地震动分量的特性;然后论述地震动时空模型,侧重于反映地震动空间变化的相关函数模型的研究现状;最后比较了大跨度结构考虑多维多点输入的抗震计算方法,包括反应谱法、时程分析法以及随机振动分析法。对今后关于这一问题所应开展的研究提出了建议。

State-of-the-Art Review on Multi-component Multi-support Seismic Response Analysis of Long-span Structures

For large-span structures, it is very necessary to take the multi-component multi-support seismic effects into account. In this paper, a state-of-the-art review on this issue is systematically made. First, multi-component earthquake and their correlations are reviewed. The characteristics of earthquake components are compared in the spectral intensity ratios, frequency, duration and correlations. Second, models considering spatially variability of earthquake are discussed. The emphasis is placed on the stateof-the-art of coherency function models. Finally, three types of seismic response analysis methods considering multi-component multi-support seismic effects are compared. The three methods are spectrum analysis method, time history analysis method and random vibration analysis method. Suggestions for the further advanced study on this topic are presented.