基于组合圆柱壳理论的大型油罐应力分析

Stress analysis of large oil storage tanks based on combined cylindrical shell

为准确获得大型石油储罐的壁板应力分布,提出了一种长-短圆柱壳解析方法.当考虑到底板与第1层壁板连接处边缘力系对第2层壁板的影响,将第1层壁板视为短圆柱壳,其他各层壁板视为长圆柱壳,同时采用刚性-弹性地基梁耦合模型模拟底板时,导出了大型油罐壁板的应力表达式.以15×104m3浮顶油罐为研究对象,进行充水试验的现场应力测试,获得了实测应力分布.结果表明,由该方法得到的理论值与实测值吻合得较好,最大误差为6.02%,满足工程误差精度的要求,可为油罐进一步大型化提供技术支持.

For accurately obtaining the stress distributions of large oil storage tanks shell, an analytical method for solving the long-short cylindrical shells was proposed. When the effects of fringe force systems within links between the bottom plate and the first shell on the second shell were considered, the first shell was regarded as a short cylindrical shell and the other shells were considered as long cylindrical shells. When the bottom plate was simulated by using a beam-coupling model on the elastic-inflexible foundation, the stress expressions for the oil tank shells were derived. By conducting watering experiment on the 15×10^4 m^3 oil tank with floating roof, the practical stress distributions were obtained by using field stress testing. The results show that the theoretical values achieved by the method agree well with the testing values when the maximum error is 6.02 %, and can satisfy the requirement of engineering precision and provide a technique support for enlarging oil tanks.