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行波效应对大跨度空间网格结构地震响应的影响

期刊名称：天津大学学报, 40卷1期: 1-8页, 2007年1月
时间：0
分类：TU311.3[建筑科学—结构工程]
作者机构：[1]天津大学建筑工程学院,天津300072
相关基金：国家杰出青年科学基金资助项目（50425824）;国家自然科学基金资助项目（50578109）.
相关项目：大跨度空间结构多维随机地震反应分析与智能控制体系研究

关键词：大跨度空间结构, 平板网格, 行波效应, 时程分析法, 随机振动, 虚拟激励法, long-span spatial structure, lattice structure, wave passage effect, time-history method, random vibration , pseudo-excitation method

中文摘要：

建立了一系列的标准正方形平板网格模型，分别采用时程分析法和随机振动虚拟激励法分析了不同跨度的网格模型在不同视波速的行波激励下的地震响应，并与一致激励下的地震响应进行了对比．结果表明，行波效应对网格结构杆件应力的影响随行波视波速的减小而增大，且对不同位置杆件的应力值的影响有所不同；当行波视波速小于500m／s时，行波效应对跨度大于60m的网格结构控制杆件内力的影响程度大于10％；当行波视波速一定时，行波效应对杆件控制内力的影响随网格结构跨度的增大而增大，不同地震激励下的行波效应差别很大，可见，行波效应对大跨度空间网格结构地震响应的影响显著；在空间网格结构抗震设计中，当结构跨度大于60m、行波视波速小于500m／s时，必须考虑行波效应对网格结构控制杆件内力的影响．

英文摘要：

A series of standard square lattice models were built. The seismic responses of the lattice models with different spans under excitation of traveling waves with different apparent velocities were investigated using the time-history method and the pseudo-excitation method for random vibration, and were compared with the seismic responses under uniform excitation. The results show that the wave passage effect on the stresses of bars of the lattice structure increases with the decrease of the apparent velocity of the traveling wave, and the effect is different for the stresses of bars at different positions. When the apparent velocity of the traveling wave is smaller than 500 m/s, the wave passage effect on the stresses of control bars of the lattice structure with span larger than 60 m is more than 10%. When the apparent velocity of the traveling wave is certain, the wave passage effect on the internal forces of bars increases with the increment of the span of the lattice structure, and varies greatly with different earthquake excitations. Some conclusions are given that the wave passage effect on the seismic responses of the long-span spatial lattice structures is significant; in the seismic design of the spatial lattice structures, the wave passage effect on the internal forces of control bars of the lattice structure must be considered when the span of the structure is larger than 60 m and the apparent velocity of the traveling wave is less than 500 m/s.

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