立式浮顶储罐并联基础隔震模拟地震振动台试验研究  

Simulated earthquake shaking table test of vertical floating roof tank with parallel base isolation

作　　者：孙建刚 崔利富 王振 刘伟兵 李想 

机构地区：[1]大连民族大学土木工程学院,辽宁大连116600

出　　处：《地震工程与工程振动》2015年第5期125-131,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51078063;51278089;51478090);中央财政拨款自主科研基金项目(DC201502040403)

摘　　要：立式浮顶储罐在强震作用下会发生罐壁屈曲、卡顶、浮顶下沉等震害。为降低储罐地震响应,以1 000 m3储罐为原型,按1:5的几何相似比设计缩尺模型,并以隔震周期为0.5 s进行并联隔震装置设计,给出其力学本构关系。采用模拟地震振动台试验方法,选取四种不同频谱特性的地震动对模型罐进行地震响应分析,结果表明:隔震层顶部加速度卓越频率有所降低,周期延长;隔震后储罐加速度、层间位移及动应力地震响应明显降低,但晃动波高有所放大;三向地震激励与单向地震激励相比,加速度地震响应明显放大,对晃动波高影响较小。建议储罐抗震减震设计时应考虑三向地震作用。In a strong earthquake the wall of vertical floating roof tank may be buckled, the top of tank may be stuck and the floating roof may subside. To reduce the seismic responses, we select a 1 000 m3 tank as the proto- type, and take 1 ： 5 as geometric similarity ratio of model and design a parallel isolation device with 0.5 s isolation period, and for which we give a mechanical constitutive relation. We select four kinds of different spectrum characteristics seismic ground motions to do the simulated earthquake shaking table test and the earthquake response anal- ysis is conducted. The result shows that ： at the top the acceleration predominant frequency of isolation layer is decreased; the acceleration, story displacement and dynamic stress are obviously decreased, but sloshing wave height is increased. Three dimensional excitations are compared with unidirectional excitation; the earthquake responses of the acceleration is obviously amplified, but the effect on sloshing wave height is negligible. Three dimensional excitation should be considered when the seismic design of the tank is carried out.

关 键 词：立式浮顶储罐 并联基础隔震 模拟地震振动台试验 三向地震激励 地震响应 

分 类 号：TU352.1[建筑科学—结构工程] TU317