大跨度张弦桁架结构地震动非一致激励响应分析  

Response analysis of large-span truss string structure under non-uniform ground motion excitation

作　　者：吕迎新 王宇[1] LÜYingxin;WANG Yu(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《建筑结构》2025年第1期15-20,49,共7页Building Structure

基　　金：辽宁省教育厅项目(LJKZ0560)。

摘　　要：为了研究地震动空间变化效应对大跨度张弦桁架结构地震响应的影响,基于经验相干函数和规范设计反应谱模拟了非平稳地震动场,对结构进行了行波输入与多点输入两种地震动非一致激励下的时程响应分析,并对其结果与地震动一致激励下响应结果进行了比较研究。研究结果表明:地震动多点输入会极大程度地提高张弦桁架结构各类型构件轴向应力;构件轴向应力幅值变化程度与构件位置及地震动激励方向有关;仅考虑行波效应会低估结构的地震响应,对于大跨度张弦桁架结构抗震设计必须考虑地震动的非一致激励。To study the effects of ground motion spatial variation on the seismic response of large-span truss string structure,based on the empirical coherency loss function and the design response spectrum in code,the non-stationary ground motion field was simulated.The time history response analysis of the structure under the non-uniform excitation of the traveling wave input and the multi-point input was carried out,and the results were compared with the response results under the uniform ground motion excitation.The results show that the axial stress of various types of members of the structure may be greatly improved under multi support excitation.The degree of variation in axial stress amplitude of members is related with the location of the members and the direction of the ground motion excitation.When the traveling wave effect is only considered,the seismic response of the structure will be underestimating.The non-uniform excitation of ground motion must be considered for the seismic design of large-span truss string structure.

关 键 词：大跨度张弦桁架 地震响应 多点激励 行波效应 相干函数 

分 类 号：TU394[建筑科学—结构工程]