地震动差动作用下大跨度空间网壳结构的反应分析  

Seismic Response Analysis of Long-span Spatial Reticulated Shell Structures Subject to Differential Seismic Motions

作　　者：白凤龙[1] 李宏男[1] 全伟[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《防灾减灾工程学报》2009年第2期154-160,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家杰出青年科学基金项目(50025823);教育部创新团队项目(IRT0518)资助

摘　　要：选取100 m跨度的双层柱面网壳结构为研究对象,采用时程分析法,分别进行了结构在单向和三向地震行波输入作用下的反应分析,并针对多种视波速情况进行了研究,考查了地震动不同输入情况下结构杆件内力的分布特点,对其进行了对比分析,为大跨网壳结构的抗震设计提供了理论依据。研究表明,考虑行波效应会使结构部分构件内力有一定程度的提高,多维地震作用比单维地震作用下结构的杆件内力大。由此得出结论:对于大跨度空间网壳结构,应该进行多维非一致输入下的地震反应分析;为保证抗震安全,应对可能出现的地面视波速进行全面分析。A double-layer cylindrical reticulated shell of lOOm span was selected as a research object to analyze its dynamic behaviors subjected to seismic excitations of one and three-dimensional wave passage effects with the time history method, including many cases of apparent wave velocities. The characteristics of the distribution of element forces under those seismic motions have been examined to compare and contrast the different situations, which provides a theoretic foundation for the aseismic design of long-span structures. The results show that the stresses of some members increase if considering the wave passage effect, and the internal forces of structural members under the multi-dimensional seismic excitation are larger than that under one-dimensional seismic excitation. Some conclusions have been drawn that the seismic analysis with non-uniform excitations of multi-dimensional seismic motions must be performed for the long-span spatial reticulated shell structures, and a comprehensive analysis should be carried out for possi-ble traveling wave velocities to make ensure the seismic safety.

关 键 词：大跨空间结构 双层柱面网壳 时程分析法 行波效应 多维地震 

分 类 号：TU352.1[建筑科学—结构工程]