超大跨网壳结构在强震作用下的复杂效应影响研究  

Research on complexity effect of super-large span reticulated dome under severe earthquakes

作　　者：支旭东[1,2] 范峰[1,2] 乔达[2] 

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2016年第9期91-98,共8页Journal of Building Structures

基　　金：国家自然科学基金重大研究计划集成项目(91315301);国家自然科学基金项目(51278152);"十二五"国家科技支撑计划(2015BAK17B03)

摘　　要：为准确分析超大跨网壳结构的地震响应,评估结构的抗震性能,采用时程分析法,分析了地震动空间相干性和行波效应、土-结构相互作用以及材料损伤累积效应等多因素对跨度800 m超大跨网壳结构的影响。结果表明:各因素对超大跨网壳结构的抗震性能均有影响;通过对比多点输入和一致输入下结构的地震响应,发现多点输入增大了结构周边杆件的内力,结构中心位置的杆件内力有减小的趋势,这也使结构的失效从其周边位置提前开展,改变了结构的破坏模式,严重削弱了结构的抗震能力;土-结构相互作用和材料损伤累积均会不同程度地增大结构的地震响应,其中土-结构相互作用放大了结构的地震动响应,而材料损伤累积效应在地震动强度较高时结构的地震动响应显著增大。To study the seismic response and the ultimate strength of super-large span reticulated domes accurately, an analysis about the seismic response of super-large span reticulated dome （800 m span） using the time-history analytic method was made considering complexity effects such as ground motion with spatial coherency and wave-passage effect, soil-structure interaction and material damage accumulation. Results show that the complexity effects can influence the seismic performance of super-large span reticulated domes. By comparing the failure modes of structures under uniform excitation and multi-support excitation, it is found that the multi-support excitations increase the internal forces of outer members, while decreasing those of inner members. Therefore, the outer members fail earlier, and the failure mode was changed which severely weakens the ultimate strength of the structure. The soil-structure interaction effect and material damage accumulation effect both increase the magnitude of seismic responses of a structure to different extent. The soil-structure interaction effect amplifies the influence of seismic action on structure, and material damage accumulation effect influences the structure obviously when the seismic amplitude is high.

关 键 词：超大跨网壳结构 空间相干性 行波效应 土-结构相互作用 材料损伤累积效应 

分 类 号：TU393.302[建筑科学—结构工程]