高阻尼橡胶隔震渡槽的设计和动力性能研究

以南水北调工程为背景,运用高阻尼橡胶隔震技术,并借鉴建筑与桥梁相关规范及设计经验对某渡槽进行隔震设计.采用Housner模型建立渡槽流固耦合有限元动力模型,分析隔震渡槽的的动力特性和地震响应.结果表明:隔震后结构前三阶振型均为隔震振型；采用高阻尼橡胶支座隔震和铅芯橡胶支座隔震渡槽的结构振型一致,自振频率基本相同；地震动特性对地震响应结果影响很大,当地震波特征频率与结构基频越相近时,槽身和支座响应越大,采用隔震支座效果越明显；三向地震动输入下,隔震渡槽各部位响应峰值可供设计时参考.

Research on design and dynamic performance of high damping rubber isolated aqueduct

Based on the background of the south-to-north water diversion project, the high damping rubber isolation technology was used for the isolation design of the aqueduct, the codes and design experiences of building and bridge were refered. A finite element dynamic model of the aqueduct is established, in which the fluid-structure coupling was considered by Housner model, witch was used to analyze the dynamic characteristic and seismic response of isolated aqueduct. The results show that the first three vibration modes of the isolated structure are the isolation vibration. The structural vibration modes of the high damping rubber isolated and the lead-core rubber isolated aqueduct are the same, and their natural frequencies are basically the same. The seismic characteristics of the ground motion exert a great influence on seismic response. The closer the characteristic frequency of seismic wave gets to the fundamental frequency of the structure, the greater the response of the aqueduct body and support will be, and the more obvious effects the isolation bearings will have. Under three-direction ground motion input, the peak responses of isolated aqueduct can be refered in design .