拱顶储罐承压圈型式与承载能力的关系

Relation Between Types of Compression Rings of Fixed Roof Tanks and Loading Capability

拱顶储罐与浮顶储罐的最大差别是前者要承受一定的内压 ,承压圈是连接顶盖 (球壳 )与筒体的主要受力构件。在现行设计规范中 ,承压圈通常是角钢型的 ,但当储罐趋于大型化时 ,角钢型承压圈无法承受一定的设计内压。对内压作用下具有三种结构型式承压圈 (角钢型、圆锥壳型、圆环壳型 )各种容积的拱顶储罐进行了比较全面的强度分析与稳定性分析。最后对三种结构型式的拱顶储罐的变形方式、应力状态、塑性变形历史、塑性极限压力、弹性失稳临界压力进行了分析与对比。

The biggest difference between fixed roof tanks and floated roof tanks was that the formers need to bear a specified internal pressure, compression ring was the major bearing component of connecting the roof (spherical shell) and the cylinder. Compression ring was in angle type according to the current standard, thus it could not bear the specified internal pressure when the volume of tanks goes up. The overall analysis of strength and stability of different scales of fixed roof storage tanks with three different types(angle type, conical type and toroidal type) under the internal pressure was presented.The analysis and contrast of deformation pattern, state of stress, plastic deformation history, plastic limit load and limit load of elastic buckling are analyzed and contrasted.