立式储罐并联隔震地震反应分析

为减少地震作用下的储罐地震响应,采用基础隔震的减震方法,将环梁基础设计成具有滑移和隔震支撑并联的结构体系,将晃动和液固耦联振动考虑为不耦合多质点体系.以基底剪力是否大于屈服剪力为判断界限,采用Newmark-β时程法研究了不同地震烈度、不同摩擦系数、不同并联滑移隔震支座负担的结构重量比γ、不同场地、不同高径比,不同隔震周期及等效阻尼比对上部储罐地震响应的影响.研究结果表明:隔震后,在一定的设计参数下,基底剪力明显减低,晃动波高有放大效应.各参数不同,隔震效果不同,参数设计存在优化问题.

Earthquake Response Analysis for the Vertical Storage Tank With the Parallel Isolation Base

In order to reduce the seismic response of storage tanks under the earthquake,the base of ring beam structure is designed as a parallel isolation structure system with the slipping and the rubber isolation support.The convection and liquid-solid coupling vibration are considered as a non-coupled multi-particle system.Depending on the judgment boundary whether the base shearing force is bigger than the yield shearing force or not,the seismic response of the tanks with the slipping and the rubber isolation support is analyzed by the Newmark-βmethod,considering the parameters of different seismic intensities,different friction coefficients,different total load ratios of the parallel isolation support structure,different locations,different ratios of height to diameter,different isolation periods and equivalent damping ratios.Results indicate that the base shearing forces of the tank are decreased obviously,and the rocking wave height is increased lightly under definite design parameters after isolation.Different parameters result in different isolation effects,thus the parameter design needs to be optimized.