基于粘弹性边界的河床式厂房地震动力响应分析
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摘要
为分析河床式厂房在地震过程中的动力反应,评价其抗震安全性并找到其抗震薄弱部位及探讨地基辐射阻尼对厂房结构动力响应的影响,运用三维非线性有限元技术,对某厂房在地震过程中的动力反应及抗震安全性进行精确计算分析.其中采用粘弹性边界考虑地基辐射阻尼影响,采用流固耦合的方式考虑水体的作用.计算结果表明:河床式厂房动力响应受顺河向地震作用明显;上部结构动力响应大于下部结构;厂房上游部位动力响应大于靠下游部位:上游排架柱拉、压应力最大达到4.53、-5.58 MPa.同时,将计算结果与无质量地基方案计算结果进行对比得到:考虑地基辐射阻尼能有效降低河床式厂房的地震动力响应,最大降幅可达64.36%.
In order to analyze the seismic response,evaluate the seismic safety,find out the seismic week part during the earthquake,and explore the influence of foundation radiation damping on the dynamic structure,the paper has precisely analyzed the dynamic response and seismic safety of a powerhouse in river channel by adopting 3Dnonlinear finite elements.The viscoelastic boundary has been used to calculate the effect of foundation radiation damping;and the fluid-structure interaction has been used to premeditate the influence of water.The calculation results show that:the ground motion along the river has an obvious effect on the seismic response of the powerhouse;the dynamic response of the upper structure is greater than that of the lower structure;the dynamic response of the upstream part is greater than that of the downstream part;the maximal tensile stress of the upper shelf reaches 4.53 MP and the maximal compression stress is-5.58 MPa.In addition,the comparison between the above calculation result and the calculation result of no mass foundation scheme shows that the seismic response of the powerhouse in river channel can be effectively reduced with a maximum degree of 64.36% by taking the foundation radiation damping into consideration.
引文
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