大型有机玻璃碗结构多工况有限元分析

Finite element analysis of large polymethyl methacrylate bowl-shaped structure under multi-load condition

有机玻璃材料越来越广泛地应用于建筑结构、海洋工程、粒子物理实验等各个领域。对某广场一直径为24m的大型有机玻璃碗进行结构设计,为缩短施工工期,有机玻璃碗采用多环形结构,各有机玻璃环可平行独立制作。为了保证结构的可靠性,采用ABAQUS有限元软件进行摩擦边界的非线性力学分析。建立有机玻璃碗和钢网壳支撑结构模型,探索了两者接触面接触形式和接触摩擦系数对结构的受力影响。采用单一安全系数法对结构在不同边界条件下进行分析校核,结果显示,摩擦系数对有机玻璃碗受力影响很小,有机玻璃碗各工况下的应力小于5.5MPa,满足设计要求。

The materials of polymethyl methacrylate(PMMA)have been widely used in the field of building structures,marine projects,particle physic experiments,and so on.A large PMMA bowl-shaped structure with a diameter of 24 m was designed.In order to shorten construction period,the PMMA bowl adopts multi-ring structure,and each PMMA ring can be made independently in parallel.In order to ensure the long-term reliability of the structure,the finite element analysis software of ABAQUS was used for the nonlinear mechanical analysis of the friction boundary.A model of PMMA bowl and its steel latticed shell supporting structure was established,and the influence of the contact boundary condition and friction coefficient between PMMA bowl and steel structure was explored.Single safety factor method was used to analyze and verify the structural stress of different contact boundaries.The results show that the friction coefficient has little effect on the stress of PMMA bowl.The stress of the PMMA bowl is less than 5.5 MPa under various working conditions,which meets the design requirement.