【摘要】 为了研究多维地震作用下大跨度储煤结构的振动特性,通过对考虑上下部协同工作的双层网壳结构进行了多维地震响应分析,对比分析双层网壳结构在单维地震与多维地震动作用下的动力响应的差别,分析结果表明:采用一致地震激励的方法进行大跨度网壳结构的动力分析是不够完善的,在进行前期工程设计时,大跨度空间结构其上下协同工作的特性不容忽视,在多维一致地震作用下,整体结构的各杆件内力响应整体大于网壳结构,下部支承结构附近的节点位移和杆件内力变化较大;多点地震激励下的整体结构的杆件内力响应整体小于一致激励,当视波速取值较大时,杆件内力与一致激励较接近。可为今后类似大跨度空间结构工程参考和借鉴。更多还原

【Abstract】 In order to investigate the vibration characteristics of big span structure for coal storage,the multidimensional seismic response analysis of double-layer reticulated shell was conducted with consideration of the cooperative work between upper structure and infrastructure.Through the comparative analysis of the difference of the dynamic response of double-layer reticulated shell between the integrated and multi-dimensional earthquakes,it was found that the consistent earthquake incentive method which is used for the dynamic analysis of latticed shell structures was not perfect.In predesign,the cooperative work between the upper structure and infrastructure of latticed shell structure should not be neglected.In multi-dimensional earthquake,the internal force response of each link is greater than that of the entire structure,and the nodal displacement and internal force of the bar of the lower bearing structure change greatly.The internal force response of each link of the entire structure under the excitation of multipoint earthquake is smaller than that of the structure under uniform excitation.When the value of apparent velocity is larger,the internal force response of each link of the entire structure under the excitation of multipoint earthquake is closer to that of the structure under uniform excitation.The conclusions can provide reference for similar long-span space structure engineering in the future.更多还原