近断层地震动作用下大型LNG储罐晃动效应研究  

Research on sloshing effect of large LNG storage tank under near fault ground motions

作　　者：罗东雨 孙建刚 柳春光[1] 崔利富 王振 LUO Dongyu;SUN Jiangang;LIU Chunguang;CUI Lifu;WANG Zhen(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;College of Civil Engineering,Dalian Minzu University,Dalian 116605,China)

机构地区：[1]大连理工大学建设工程学部水利工程学院,辽宁大连116024 [2]大连民族大学土木工程学院,辽宁大连116605

出　　处：《自然灾害学报》2020年第5期99-107,共9页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51878124);中央财政自主基金项目(wd01121)。

摘　　要：为研究16×10^4m^3LNG储罐在近断层地震动作用下的晃动效应,并对比近断层地震动和其他类型地震动对大型储罐响应的差别,选取5条不同脉冲周期的近断层地震波和4条Ⅱ类场地普通地震波作为地震激励,应用有限元软件ADINA建立三维储罐模型,采用动力时程积分法进行地震响应分析。研究表明:与普通地震动相比,近断层地震动作用下储罐的地震响应偏大;近断层地震动会激发更为剧烈的液面晃动,而脉冲周期是影响储液晃动的主要因素;剧烈的储液晃动对内罐壁和穹顶造成较大冲击,从而导致内罐壁上部有效应力和加速度激增,储液上部动液压力存在突变,穹顶的有效应力增大。故在断层区设计建造LNG储罐时应设计防晃装置,避免因晃动过大而引起储罐的泄露和破坏。To study the sloshing effect of 16×10^4m^3 LNG storage tanks under the near-fault ground motions and compared the responses of tanks under near fault ground motions and common ground motions,5 near fault ground motions with different pulse period and 4 common ground motions on site II were selected as earthquake excitation,three-dimensional tank model was established by using the finite element software ADINA,and the seismic response was carried out by the dynamic time integration method.The results are as followings:the seismic responses of storage tanks under the near fault ground motions is larger than common ground motions.Near fault ground motions will cause more severe sloshing,while the pulse period is the main influencing factor.The severe sloshing of the liquid has a great impact on the inner tank wall and dome,which leads to the sudden increase of the stress and acceleration on the upper part of the tank wall,the sudden change of the dynamic hydraulic pressure of the upper liquid,the increase of the effective stress of the dome.Therefore,the anti-sloshing device should be installed in the design and construction of the large LNG storage tanks which in the fault zone to avoid the leakage and damage of the storage tanks due to excessive sloshing.

关 键 词：近断层 脉冲周期 LNG储罐 液面晃动 罐壁应力 ADINA 

分 类 号：TU352.11[建筑科学—结构工程]