立式储液罐提离机理及“象足”变形产生原因  

Uplift mechanism and elephant foot bulging of elevated liquid-storage tank

作　　者：戴鸿哲[1] 王伟[1] 吴灵宇[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2008年第8期1189-1193,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50678056)

摘　　要：为了研究立式储液罐的提离机理及大变形产生的原因,从而减轻储液罐在地震灾害中的损失.基于ANSYS软件建立了考虑液体晃动和罐底提离的立式圆柱形储液罐结构有限元模型,并分别进行了水平荷载和竖向荷载作用下罐底提离及"象足"变形分析.数值分析结果表明:由于倾覆力矩作用使罐壁受拉侧罐底边缘倾向于脱离地基,并将储液罐底板局部向上拉起,即所谓罐底提离,形成月牙区域.罐壁"象足"变形产生的原因主要是由于罐壁的纵向压应力达到或超过屈曲临界应力,是一种屈曲破坏,而不是强度破坏.In order to investigate the uplift mechanism and reasons of the large deformation for on elevated liquid-storage tank, this paper performs a seismic response analysis with ANSYS under horizontal and vertical loads by building the finite element model of a spherical elevated liquid-storage tank considering the fluid sloshing. The numerical results show that the tensile tank bottom trends to divorce from the foundation and the bot tom of the tank uplifts locally due to the effect of lifting moment, thereby the crescent area is caused by the lift of tank bottom. In addition, the elephant foot bulging is in fact the buckling failure caused by the overcritical compression stress rather than the intensity failure.

关 键 词：立式储液罐 提离机理 象足变形 

分 类 号：TU352[建筑科学—结构工程]