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为分析水体晃动对多槽式渡槽结构动力特性的影响,基于流固耦合理论,以南水北调中线工程某双槽式渡槽为例进行研究。应用Westerguard水体附加质量法模拟水体与结构的动力相互作用,采用MIDAS/CIVIL计算软件对该双槽式渡槽的自振特性和地震反应进行有限元计算,分析水体对渡槽动力特性的影响。并选用具有隔震和耗能双重功能的摩擦摆支座对大型渡槽结构进行隔震研究。计算结果表明,摩擦摆支座纵横向隔震能够大幅减小墩顶位移和墩底内力,从而满足结构的抗震需求。
In order to analyze the influence of water sloshing on the dynamic characteristics of multi-tank aqueduct structures, a double-tank aqueduct in the midline of South-to-North Water Transfer Project is studied based on the fluid-solid coupling theory. The hydrodynamic interaction between water body and structure was simulated by the Westerguard water mass method. The self-vibration characteristics and seismic response of the double-tank aqueduct were calculated by using MIDAS / CIVIL software. The influence of water body on the dynamic characteristics of the aqueduct was analyzed. Seismic research on the large-scale aqueduct structures is made by using the friction pedestal with dual functions of isolation and energy dissipation. The calculation results show that the longitudinal and transverse isolation of the pendulum pedestal can greatly reduce the top displacement and pier internal forces, so as to meet the seismic requirements of the structure.