广州新客站结构多点输入地震反应分析
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摘要
广州新客站的站房和雨棚结构均为结构体系复杂的超长结构,对其进行了考虑地震行波效应的多维多点输入地震反应分析,并与一致输入的结果进行对比。考察了多点输入地震对结构的扭转效应、构件内力的影响,研究了地震行波效应影响系数的分布规律和影响因素。站房结构多点输入下扭转效应增大明显,但绝对数值并不大。大多数竖向构件在多点地震输入下的反应小于在一致激励地震输入下的反应,行波效应影响系数较大的构件主要为结构的边柱和角柱。屋盖结构行波效应影响系数分布规律与屋盖结构形式和质量分布有较大关系。地震波视波速较小时,结构在多点输入下的非同步性更加明显,反映为基底总剪力峰值较小,扭转效应更大,地震行波效应影响系数更大。分析结果为结构设计中考虑多点输入影响提供了依据。
The structure of New Guangzhou Railway Station is complicate and over-length.The time-history seismic analysis considering traveling effect and double direction input is carried out,and the result is compared with that of single-support excitation analysis.The torsion effect and internal force of important members,the distribution and influence of wave traveling effect factor are studied.The torsion effect increases obviously,though the absolute effect result is not huge.The response of most of the vertical members under multi-support seismic excitation is less than that under single-support excitation,and the members on which multisupport excitation has great effect are generally edge columns or corner columns.The distribution of effect factor on roof members is decided by the structure type and mass distribution.When the traveling velocity decreases,the synchronization under multi-support seismic excitation decreases too.It is shown that the basement shear force decreases,torsion effect increases and the wave traveling effect factor increases.The analysis results provide basis for the consideration of multi-support excitation in large-sized structure design.
The structure of New Guangzhou Railway Station is complicate and over-length.The time-history seismic analysis considering traveling effect and double direction input is carried out,and the result is compared with that of single-support excitation analysis.The torsion effect and internal force of important members,the distribution and influence of wave traveling effect factor are studied.The torsion effect increases obviously,though the absolute effect result is not huge.The response of most of the vertical members under multi-support seismic excitation is less than that under single-support excitation,and the members on which multisupport excitation has great effect are generally edge columns or corner columns.The distribution of effect factor on roof members is decided by the structure type and mass distribution.When the traveling velocity decreases,the synchronization under multi-support seismic excitation decreases too.It is shown that the basement shear force decreases,torsion effect increases and the wave traveling effect factor increases.The analysis results provide basis for the consideration of multi-support excitation in large-sized structure design.
引文
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[4]刘枫,杜义欣,赵鹏飞,等.武汉火车站多点输入地震反应时程分析[J].建筑结构,2009,39(1):11-15.
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[6]丁阳,张笈玮,李忠献.行波效应对大跨度空间结构随机地震响应的影响[J].地震工程与工程振动,2008,28(1).
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