基于实测沉降的浮顶储罐变形分析

摘要

基于实测沉降数据,研究浮顶储罐在不均匀沉降作用下的变形响应.采用经典弹性力学理论,推导储罐在不均匀沉降作用下的径向位移理论公式.采用有限元模拟方法,分别应用实体单元和壳单元模拟储罐在不均匀沉降作用下的变形响应,将模拟结果与理论公式计算结果进行比较与分析.在此基础上,采用双指数衰减函数拟合法,推导含顶部抗风圈储罐在不均匀沉降下的径向位移理论公式.将有限元模拟方法与理论公式进行比较和验证,结果表明:对于具有不同尺寸、不同结构形式抗风圈的储罐,该理论公式可以准确地应用于计算其在不均匀沉降作用下的变形情况,预测在役储罐可能的失效模式.%The distortion behavior of floating-roof tanks under differential settlement was investigated based on measured settlement.The radial displacement formula of tanks under uneven settlement was derived by applying the classical elasticity theory.Using finite element method,distortion response of tanks under uneven settlement was simulated by solid element and shell element,respectively.Results of theoretical formula and finite element method were compared and analyzed.Based on that,double exponential attenuation function fitting method was applied to obtain the radial displacement formula of tanks with eave wind girder under uneven settlement.The finite element simulation method was applied to compare with the formula and verify it.Results show that for tanks with eave wind girders which have different forms and sizes,the formula can be used to calculate tanks distortion under uneven settlement accurately,thus to predict the potential failure modes of in-service tanks.