超长结构地震行波效应影响因素研究  

Study on influential factors for super-long structures under seismic traveling wave action

作　　者：范重[1] 柴丽娜 张宇[1] 邢超[1] 刘家名 FAN Zhong;CHAI Lina;ZHANG Yu;XING Chao;LIU Jiaming(China Architecture Design ＆ Research Group,Beijing 100044,China;School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国建筑设计研究院,北京100044 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《建筑结构学报》2018年第8期119-129,共11页Journal of Building Structures

基　　金：中国建设科技集团科技创新基金(Z2016J05)

摘　　要：提出确定超长结构行波效应视波速的实用方法,并对视波速的影响因素进行了深入分析。建立可以同时考虑桩基础水平刚度和转动刚度的多点激励计算模型,并以带有大跨度屋盖的多层超长航站楼为研究对象,对结构在沿长边方向地震行波作用下的位移、楼层剪力和构件内力等进行了全面分析。计算结果表明,视波速主要与基岩剪切波速、震源深度和震中距有关,基岩剪切波速越快、震中距越小、震源深度越深,则视波速越大。多点激励得到的楼层水平剪力小于一致激励,随着视波速降低,多点激励与一致激励下的楼层剪力之间的差异进一步加大。沿长边方向激励时,视波速和基础刚度的变化对下部楼层的层间位移角影响显著;沿短边方向激励时,视波速对上部楼层的层间位移角影响较大,但基础刚度对其影响较小。对称结构在平行于地震传播方向进行多点激励时,结构不发生扭转;在垂直于地震传播方向进行多点激励时,结构出现明显的扭转效应。沿长边方向多点激励时底部楼层部分框架柱内力增大,沿短边方向多点激励时各楼层均有少量框架柱内力起控制作用;随着视波速增大,框架柱内力逐渐减小;考虑基础刚度后,框架柱内力可显著降低。多点激励对大跨度屋盖部分杆件起控制作用;随着视波速降低,大跨度屋盖杆件内力逐渐减小,基础刚度的影响可忽略不计。A practical calculation method for apparent wave velocity was proposed for traveling wave effect analysis of super-long structures, and the influences of apparent wave velocity were analyzed in this paper. A multi-support excitation model taking account of both horizontal and rotational stiffness of the pile foundation was established. Taking a multistory super-long terminal structure with a large span roof as an illustrative example, the displacements, horizontal seismic forces, and internal forces of members under earthquake travelling along the longitudinal direction were analyzed comprehensively. The results show that, the apparent wave velocity is mainly affected by the shear wave velocity of bedrock, hypocenter depth and epicenter distance, where a faster bedrock shear wave velocity, a smaller epicenter distance, or a deeper focal depth could all lead to a larger the apparent wave velocity. The story shear forces caused by multi-support excitation is less than that caused by uniform excitation. With a decrease in apparent velocity, the differences between multi-support excitation and uniform excitation are more obvious. When under multi-support excitation along the longitudinal direction, the change of apparent wave velocity and foundation stiffness has a significant influence on the inter-story drift angle of the lower floor; when under multi-support excitation along the transverse direction, the apparent velocity has a great influence on the inter-story drift angle of the upper floor, but the effect of the foundation stiffness is small. When the symmetrical structure is excited in the direction parallel to earthquake propagation, torsional effect is insignificant; but when excited in the direction perpendicular to earthquake propagation, an obvious torsional effect would occur. When under multi-support excitation along the longitudinal direction, the internal force of some frame columns on the bottom floor increases; when under multi-support excitation along the transverse direction, the internal force of

关 键 词：超长结构 基础刚度 行波效应 视波速 多点激励 地震响应 

分 类 号：TU312[建筑科学—结构工程] TU470