摘要
以航站楼为背景,建立了下部为3个混凝土结构单元、上部为整体钢屋盖结构的计算模型,对复杂超长结构在地震行波激励下的响应进行了深入分析。选取了5条天然波和2条人工波,分别沿地震传播方向和垂直地震传播方向进行激励,并考虑了不同视波速的影响,分析了航站楼复杂超长结构的行波效应。结果表明:复杂超长结构存在对称和反对称的局部振型,由于局部振型质量参与系数较小,振型分解反应谱法难以准确反映结构的地震响应;与一致地震输入相比,多点地震输入分析时下部楼层地震剪力增幅较大,且地震传播方向影响显著,对称结构也需要分别考虑正、反2个地震传播方向;多点地震输入时结构的最大层间位移角、扭转位移比、框架柱和钢屋盖杆件的内力均有可能大于一致地震输入的计算结果,超载构件分布具有一定规律性;由于沿长轴方向与沿短轴方向进行激励均可能起控制作用,进行复杂超长结构多点分析时应同时考虑双向地震的作用。
Based on the background of terminal building,the calculation model with three concrete structural units at the lower part and the steel roof structure at the upper part was established.The response of complicated super-long structures under seismic traveling wave excitation was analyzed comprehensively.Five natural waves and two artificial waves were selected to excite in both earthquake propagation direction and perpendicular direction,and the effects of different apparent wave velocities were considered.The traveling wave effect of complicated super-long structure for terminal building was analyzed.The results show that there were symmetrical and antisymmetrical local vibration modes in complicated super-long structures.Because the mass participation coefficient of local modes is small,it is difficult to accurately reflect the seismic response of structures by vibration mode decomposition response spectrum method.Compared with the uniform input,the shear force of the lower floor increases greatly in multi-point input analysis,and the direction of seismic propagation has significant impact.The symmetrical structure also needs to consider the positive and negative directions of seismic propagation respectively.The maximum inter-story displacement angle,torsional displacement ratio,internalforces of frame columns and steel roof members may be larger than those calculated by the uniform input method,and the distribution of overloaded members has certain regularity.Because excitation along long and short axes may play a controlling role,the effect of bidirectional earthquake should be taken into account in multi-point analysis of complicated superlong structures.
作者
范重
刘学林
张宇
柴丽娜
FAN Zhong;LIU Xue-lin;ZHANG Yu;CHAI Li-na(China Architecture Design & Research Group,Beijing 100044,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《建筑科学与工程学报》
CAS
北大核心
2019年第1期56-66,共11页
Journal of Architecture and Civil Engineering
基金
中国建设科技集团科技创新基金项目(Z2016J05)
关键词
复杂超长结构
行波效应
多点地震输入
一致地震输入
地震响应
complicated super long structure
traveling wave effect
multi-point input
uniform input
seismic response
