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结合南水北调中线工程,利用铅芯橡胶隔震技术对双洎河大型双槽渡槽进行隔震设计,采用Housner模型考虑水体与槽身流固耦合作用对其进行有限元动力分析。与非隔震渡槽相比,隔震渡槽的频率大幅降低;随隔震周期的增加,隔震渡槽振型保持不变;槽身底部剪力减小,支座位移增大。等效线性模型计算的地震响应极值大于双线性模型,偏安全。结果表明,铅芯橡胶隔震技术可显著降低渡槽结构的地震响应,且隔震周期越大,降幅亦越大。
Combined with the midline project of South-to-North Water Diversion, the seismic isolation design of Shuangta River large-scale double-tank aqueduct was carried out by using lead-rubber isolation technology. The Housner model was used to carry out finite element dynamic analysis considering fluid-solid interaction between water body and aqueduct. Compared with the non-isolated aqueduct, the frequency of the isolated aqueduct is greatly reduced. With the increase of the isolation period, the vibration mode of the isolated aqueduct remains unchanged; the shear force at the bottom of the aqueduct decreases and the displacement of the support increases. The equivalent linear model calculates the extreme value of the seismic response greater than the bilinear model, partial safety. The results show that the seismic isolation of aqueduct structures can be significantly reduced by the lead rubber seismic isolation technology, and the greater the seismic isolation period, the greater the decline.