考虑水体晃动的多槽式渡槽结构地震反应研究

Seismic Response Study on Multi-body Aqueduct Structure Considering Water Sloshing

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 analyse the effects of water sloshing on muhi-body aqueduct dynamic characteristics, based on the fluid-structure coupling theory, the double-body aqueduct of South to North Water Diversion Project was studied. The added mass method was used to simulate the dynamic interaction between water and aqueduct structure. The free vibration characteristics and seismic response of the aqueduct were calculated by the MIDAS/CIVIL software. The effects of water sloshing on aqueduct dynamic characteris- tics were analyzed. Friction Pendulum Bearings （FPB） with double function of seismic isolation and energy dissipation were adopted to study the seismic isolation of large aqueduct. The results show that the longitudinal and lateral isolation of FPB can reduce signtificantly the top displacement and bottom internal forces of piers satisfying the requirement of seismic resistance.