考虑随机几何初始缺陷的储油罐抗震可靠度分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (21) : 35-40.

论文

徐亚洲1，娄燕芳2

作者信息 +

Aseismic reliability analysis for oil storage tanks with random geometric initial imperfections

XU Yazhou1, LOU Yanfang2

Author information +

文章历史 +

摘要

本文采用屈曲模态的线性组合形成初始缺陷构型，假定缺陷幅值服从零均值正态分布，通过拉丁超立方抽样法生成几何初始缺陷样本。进而，采用增量动力分析法获得加速度峰值与罐壁径向位移最大值的关系，并根据Budiansky-Roth准则确定出地震作用下罐壁失稳临界应力值。基于ABAQUS用户单元子程序实现了基于附加质量法的缺陷储油罐地震反应分析。据此，求解出随机地震作用下考虑和未考虑初始几何缺陷的储油罐可靠度。对比分析表明，随着地震作用的增大，罐壁最大压应力离散程度也增大，其概率分布呈现出非正态性，随机初始几何缺陷显著降低了储油罐的抗震可靠度。

Abstract

Here, random initial imperfection configuration of an oil storage tank was modeled with a linear combination of its buckling modes, and the imperfection amplitude was assumed to be a normal random distribution with mean of zero.Geometric initial imperfection samples were generated with Latin hypercube sampling method.Then, the incremental dynamic analysis method was employed to obtain the relation between the peak of acceleration and the maximum radial displacement of the tank wall, and according to Budiansky-Roth criterion, the critical buckling stress of the tank wall was determined under the action of earthquake.Furthermore, a user-defined subroutine based on ABAQUS was used to realize seismic response analysis of the imperfect oil storage tank with the added mass method.Finally, the reliabilities of the oil storage tank considering geometric initial imperfections and not considering them under the action of random earthquake were solved.The contrastive analysis showed that with increase in seismic action, the dispersion degree of the maximum compression stress of the tank wall increases; its probability distribution exhibits non-normal characteristics; the random geometric initial imperfections significantly reduce the aseismic reliability of oil storage tanks.

导出引用

徐亚洲1，娄燕芳2. 考虑随机几何初始缺陷的储油罐抗震可靠度分析[J]. 振动与冲击, 2018, 37(21): 35-40

XU Yazhou1, LOU Yanfang2. Aseismic reliability analysis for oil storage tanks with random geometric initial imperfections[J]. Journal of Vibration and Shock, 2018, 37(21): 35-40

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