摘要
针对大型球罐支柱多、各支柱不易安装在同一水平面上以及地基有局部下沉时所引起的支柱载荷不均匀等情况会对支柱强度和球罐安全带来影响的问题,采用数值计算方法,对球罐支柱单根沉降、整体倾斜、两边沉降和中间沉降4种基础不均匀沉降的形式进行了有限元计算与分析,得到了沉降前后球壳整体的应力分布。分析发现,在各种沉降形式下结构最大应力随沉降量的变化均呈现线性规律。在上述研究基础上,提出了支柱反力不均匀度的概念,并发现不均匀度随沉降量增大也呈现线性增加的规律。此外还分析了发生沉降时支柱最大压缩应力的变化规律,对球罐支柱的准确设计有一定的借鉴意义。
For large spherical tanks,it is difficult to install all support legs in a reasonable same horizontal level,and the local subsidence of the foundation could cause unequal loading among the support legs.These conditions might reduce the strength of support and lower the overall safety level of the spherical tank.Four subsidence patterns which included single support subsidence,whole incline,two-side straddle subsidence and middle subsidence were analyzed using finite element method.The stress distributions of the whole spherical tank when subsidence occurred were obtained.It was found that the maximum stresses of the structure vary linearly with the change of the amount of subsidence under all patterns.Based on these results,the concept of support reaction unevenness was then put forward,and the unevenness was found,similar with that of the maximum stresses,to increase linearly with the increase of subsidence.Rules on the maximum compress stresses in the legs when subsidence exists were also analyzed which could be taken useful references in the accurate design of support legs of spherical tanks.
出处
《石油化工设备》
CAS
2009年第4期12-17,共6页
Petro-Chemical Equipment
