立式埋地玻璃钢圆柱壳的稳定性分析

ANALYSIS ON THE STABILITY OF VERTICAL BURIED GLASS FIBER REINFORCED PLASTIC CYLINDRICAL SHELL

基于工程实际,采用承压不承拉的杆单元模型解决埋地结构与周围土体的相互作用问题,推导出杆单元与土体之间材料参数表达式,建立有限元计算模型,实现立式埋地玻璃钢圆柱壳结构稳定性有限元分析。通过与传统公式计算结果比较,得出传统稳定性计算公式不能用于计算立式埋地结构。参数对结构稳定性的影响结果表明:增加结构的厚度、弹性模量以及周围土弹性模量可提高稳定性,其中厚度的影响更为显著;结构稳定性随壳体长度的增加而降低。在工程应用中可采用加筋结构减小计算长度以及选择合适的回填材料和回填方式来提高土的弹性模量的方法,有效提高稳定安全性,对经济性影响较小。

In order to determine the stability of vertical buried FRP cylindrical shells,several traditional formulas for stability calculation are introduced. Then,based on engineering practice,and by using the rod model without pressure bearing to solve the problem between the buried structure and the surrounding soil,the material parameter expression between the rod element and the soil is deduced,and the basic finite element calculation model is established. Compared with the traditional formula,the traditional stability formula can not be used to calculate the vertical buried structure. The influence of parameters on structural stability shows that the thickness of the structure,the elastic modulus and the elastic modulus of the surrounding soil can improve the stability and the influence of the thickness is more obvious. The structural stability decreases with the increase of shell length.In engineering application,by using the reinforcement structure to reduce the calculation length and choose the appropriate back-fill material and back-fill method to improve the elastic modulus of soil,the stability and security can effectively be improved,and has less impact on economy.