行波效应下大跨度门式桁架结构的抗震分析摘要：本文以大跨度门式桁架结构为讨论对象，首先用时程法对行波效应下结构的地震反应进行了计算，分析结果表明，由于附加对称振型振动的激起，在地震动的多点输入下，结构的地震反应有很大程度的提高。结合大跨度门式桁架结构的具体结构形式，本文进一步提出了基于振型组合理论的平均反应谱法，类似于传统的反应谱法，这种新抗震设计方法的优点在于通过简单的振型组合可以计算出多点输入下结构的最大地震反应。最后本文通过与时程法计算结果的比较，验证了平均反应谱法的正确性，从而为在大跨度门式桁架结构抗震设计中考虑多点输入的影响提供了一种简单而有效的分析计算方法。关键词：大跨度门式桁架结构；多点输入；地震反应谱；抗震设计Seismic response analysis of arch truss structure under wave passage effectAbstract: The seismic responses of a large-span arch truss structure are first checked considering the wave passage effect. The results show that the seismic responses of the structure are amplified by wave passage effect because of the additional vibration of symmetrical structure mode. Based on the calculation results, the average response spectrum method is proposed in the paper to include the effects of variations of ground motion in the seismic response of structures. The significant advantage of the method is that the peak seismic structural responses considering the spatial effects can be obtained as simply as the conventional response spectrum method does. The comparison between the results of time history method and that of the average response method shows the precision of the proposed method. The simplified method also makes it possible in the practical seismic design of two-point-support large-span arch structure to consider the effects of variations of ground motion effectively and precisely.Keyword: large-span arch truss structure; multi-support excitation; response spectrum; seismic de...
