大跨单层折面空间网格结构施工全过程分析

以深圳大运会体育场大跨屋盖为工程背景,分析了新型＂单层折面空间网格结构＂的受力特点;基于大跨空间网格结构的矩阵力学模型,考虑结构在施工过程中几何时变、约束时变、荷载时变等特征的基础上,建立了考虑时变效应的施工状态非线性求解分析方法及其步骤,并利用ANSYS的APDL语言编制了单层折面空间网格结构的施工全过程分析程序。分析结果表明：结构在施工过程中的最大位移、最大应力均随之出现一定程度的波动;支撑内力在卸载过程中均有较大波动,其波动幅度最大接近于初始值的2倍;施工完成时结构中的应力与设计状态存在差异,位移分布也出现了不对称的现象。分析结果可为临时支撑的设计与施工过程的控制提供指导和依据。

Construction Process Analysis of the Single-Layer Folded Space Grid Structure

Taking Shenzhen universiade stadium as engineering background,the mechanical character of a new style ＇single-layer folded space grid structure＇ was analyzed.Based on the matrix mechanical model and considering the time-dependent effects of geometry,constraint,and load in construction process,the state-nonlinear construction process analysis method was established.And the analysis program was formed by the APDL platform of finite element software ANSYS to analyze the single-layer folded space grid structure.It is shown that both the maximum displacement and stress wave in construction.The bracing forces wave strongly in the unloading process and the maximum amplitude approximates 2 times of the initial value.The stress state differs from the design state when construction process is finished,and the displacement distribution is not completely symmetrical.The analytical results can guide the temporary supports design and construction process control.