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结合南水北调中线沙河南—黄河南沙河段工程,借鉴桥梁相关规范和设计经验,采用双曲面球型支座减隔震技术对渡槽进行隔震设计,提出了支座设计流程及支座关键部位球芯的详细设计步骤;然后应用SAP2000有限元软件,分析渡槽结构的动力特性和地震响应,并采用非线性时程分析方法和减震率指标与渡槽铅芯橡胶支座、高阻尼橡胶支座的减隔震效果进行了对比分析。结果表明,采用三种隔震支座后,渡槽支承结构顶部位移及底部剪力都明显减小,但双曲面球型减隔震支座的渡槽减震效果更好。
Combined with the relevant specifications and design experiences of the bridge with the project of Shahe Nan - Yellow River Nansha River in the middle line of South - to - North Water Diversion Project, the seismic design of the aqueduct is carried out by using the hyperboloid ball bearing seismic isolation technology. The design flow of the support and the key ball Then, the dynamic characteristics and the seismic response of the aqueduct were analyzed by SAP2000 finite element software. The nonlinear time history analysis method and the indexes of shock absorption were compared with those of the aqueduct lead rubber bearing, the high damping rubber bearing Vibration reduction effect of the comparative analysis. The results show that the displacement and the bottom shear force of the aqueduct support structure decrease obviously with the three kinds of isolation bearings, but the aqueduct with the hyperbolic spherical isolation bearings has a better damping effect.