大型储罐地震作用下罐壁抗失稳可靠度分析

大型储罐在地震作用下的典型破坏形式是"象足"屈曲破坏,而轴向压应力是"象足"屈曲破坏的主要因素。结合实际工程情况,运用大型通用有限元分析软件Adina对大型储罐在不同地震烈度、储液深度下的罐壁轴向压应力进行地震作用下的数值模拟,并运用可靠性分析的JC法,分析大型储罐不同储液深度、不同地震烈度下的罐壁抗失稳可靠度情况。结果表明:在同一地震烈度下,随着储罐储液深度的增加,储罐罐壁的轴向压应力将随之增大;大型储罐同一地震烈度下储液深度越大,罐壁轴向抗失稳可靠度越低;在实际工程设计中应该首先进行工程场地地震安全性评价,尽可能避开地震带。

Reliability analysis on anti-buckling effect of large storage tank shell under earthquake

Elephant-foot buckling is a typical failure mode of the large storage tank under the earthquake,and axial compressive stress is the main factor of elephant-foot buckling.Considering the practical engineering situations,the large storage tank was simulated under the earthquake using large general finite element analysis software Adina.The effect of seismic intensity and depth of liquid on the axial compressive stress in the bottom of the tank shell was considered.The reliability on the anti-buckling effect of the storage tank was calculated in different depth of liquid and seismic intensity using JC method.The results show that in the same seismic intensity,the axial compressive stress along tank wall increases with the depth of liquid in the storage tank increasing.The axial anti-buckling reliability along the tank wall decreases with the depth of liquid increasing under the same seismic intensity in large storage tank.In practical engineering design,the site seismic safety should be evaluated firstly,as far as possible to avoid the earthquake zone.