新型煤气柜内压弯曲分析方法研究∗

摘要

严格控制新型高压煤气柜内压弯曲，是保证结构气密性和正常运行的关键问题，其受力模型为具有多根环向加筋圆柱壳受局部内压作用的弹性弯曲.把弹性地基板条梁法拓展应用到该结构体系；同时对传统离散加筋法进行改进，考虑了壳体厚度、半径及加筋肋间距对结构环向刚度的影响.以30万m3新型煤气柜为例，采用弹性地基板条梁法、改进离散加筋法、密加筋法和有限元法进行了分析.在此基础上，给出了判定环向加筋圆柱壳密肋、稀肋的方法.分析结果表明，弹性地基板条梁法具有适用性强、精度高、效率好；当环向加筋间距dr>3.875(Rh)1/2时，改进离散加筋法计算效率较高.%The bending of a new typical gas holder under gas pressure is crucial to ensure the normal operation of the structure.It can be simplified to elastic bending of ring stiffened cylindrical shell,which is under partial internal pressure and has multiple circular reinforced ribs.Stripe Beam on Elastic Foundation Method (SBEFM)was extendable to the structure system.At the same time,traditional discrete stiffened method (TDSM)was improved.A gas holder of 300 000 m3 was taken as an example for analysis.On this basis,the method j udging ring stiffened cylindrical shell smeared or discrete was presented.The new anal-ysis shows that SBEFM has a wider applicability,higher accuracy and better efficiency than other methods and the improved discrete stiffened method is effective when the ring spacing is greater than 3.875 (Rh)1/2 .