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 dynamic response of riverbed plant during the earthquake, evaluate its seismic safety and find its weak parts against earthquakes and investigate the influence of radiative damping on the dynamic response of the plant structure, a three-dimensional nonlinear finite element method Dynamic response and seismic safety in the process are calculated and calculated accurately.The viscoelastic boundary is considered considering the effect of radiation damping on the foundation and fluid-structure interaction is taken into account.The calculation results show that the dynamic response of the riverbed-type plant is affected by the earthquake The dynamic response of the superstructure is greater than that of the substructure; the dynamic response of the upstream part of the plant is greater than that of the lower part: the tension and compressive stress of the top row of cantilever beams reaches 4.53-5.58 MPa maximally. Meanwhile, the calculation results are compared with the calculated results of the massless foundation scheme The results show that considering the radiative damping of foundation can effectively reduce the seismic dynamic response of the riverbed plant, the maximum decrease can reach 64.36%.