基于Flac3D的大型储液罐基础环梁拉力分析

Analysis of tension in ring beam of large-scale oil storage tank foundation by using Flac3D software

采用Flac3D商用软件对大型储液罐的充水试验进行数值模拟,并对储液罐、基础环梁和地基土层组成的耦合系统进行动力计算,考察环梁在静动力荷载作用下的响应规律以及影响环梁环向拉力的主要因素.研究表明,环梁环向拉力随试水分级加载而逐级增大,水平地震作用下,环梁环向拉力在静荷载引起拉力的基础上累积增加;垫层材料对环梁环向拉力的影响较大,采用灰土石垫层时,环梁环向拉力比采用素土垫层小18.3%;与数值计算结果相比,按规范公式计算静荷载作用下基础环梁的最大环向拉力偏大42%.

Numerical simulation was conducted with Flac3D commercial software for water-filling test of largescale liquid storage tank,and dynamic computation was performed for a coupled system composed of storage tank,ring beam of foundation,and soil layer of foundation.The patterns of response of the ring beam to the action of static and dynamic loads were investigated.The main factors that have influence on the circumferential tension in the ring beam were investigated,also.It was shown by the investigation that the circumferential tension in ring beam was gradually increased with the amount of water filled and the load applied.The circumferential tension in ring beam was increased accumulationally on the basis of the tension occurred under the action of static load of horizontal earthquake.The cushion materials had a greater influence on the circumferential tension in ring beam;it would be decreased by 18.3% for cushion of combined soil,cement,and gravel instead of pure soil cushion.Compared with numerical computation result,the maximal circumferential tension in ring beam calculated with standard formula under static load action was greater by 42%.