大跨度高位连体桁架竖向地震响应随机振动分析

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摘要采用绝对位移直接求解的虚拟激励法,利用ANSYS有限元分析软件的谐响应分析模块,对某大跨度高位连体结构进行竖向一致、行波激励下的地震响应随机振动分析。结果表明:大跨度高位连体桁架竖向地震作用系数明显比《建筑抗震设计规范》给出的屋架竖向地震作用系数大,平均增幅达50%左右;竖向行波激励能减小连体桁架的动力响应,设计时不需考虑竖向地震行波效应。

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关键词 ：大跨度, 连体桁架, 竖向地震, 随机振动, 行波效应

Abstract：Large-span connected trusses in high position of a connected structure are analyzed by pseudo excitation method based on solving absolute displacement in ANSYS harmonic response analysis program,considering vertical uniform and wave-passage earthquake excitations.The results showed that the coefficients of vertical earthquake action of large-span truss in high position are larger than the coefficients of large-span roof truss provided by national code for seismic design of buildings,and the amplitudes of the coefficients of vertical earthquake action may be increased by 50% in average.The axial forces of members of large-span truss have been decreased when considering the wave-passage effect,so the vertical wave-passage effect can be ignored in structure design.

Key words： large-span connected truss vertical earthquake excitations stochastic vibration wave-passage effect

基金资助:

国家自然科学基金资助项目(51168037,51068008);江西省自然科学基金资助项目(2009GZW0011)

引用本文:

李永华；胡远辉；谢震灵；程付根. 大跨度高位连体桁架竖向地震响应随机振动分析[J]. 南昌大学学报（工科版）, 2012, 34(02): 134-.
LI Yong-hua1,HU Yuan-hui2,XIE Zhen-ling2,CHENG Fu-gen2. Vertical Seismic Response Stochastic Vibration Analysis of Large-span Connected Truss in High Position. , 2012, 34(02): 134-.

链接本文:

http://qks.ncu.edu.cn/Jwk_xbgkb/CN/ 或 http://qks.ncu.edu.cn/Jwk_xbgkb/CN/Y2012/V34/I02/134