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深圳宝安体育场采用了长轴237m、短轴230m、进深54m的椭圆形车辐式张拉结构,结构找形是该项目设计的关键。该文在分析车辐式张拉结构受力特点的基础上得出车辐式张拉结构上弦、下弦拉力的合力线在一个曲面上,形成上弦、下弦合力线虚拟结构。基于平衡荷载与合力线虚拟结构拉力水平分量之间的关系,给出了计算合力线虚拟结构形状的有限元列式;根据合力线虚拟结构形状和上弦、下弦拉力水平分量的比值确定飞柱的上、下节点位置;根据索桁架上弦和下弦两端端点坐标、索拉力水平分量及吊索拉力和节点荷载,确定整个车辐式张拉结构的形状。给出了找形后结构分析和索张拉控制的初应变计算公式以及边界结构弹性变形的处理方法;对深圳宝安体育场车辐式张拉结构进行了找形。该文的找形方法计算简单、准确,既可以通过编制有限元程序计算,也可以通过现有有限元软件实现。
Shenzhen Baoan Stadium uses a long axis of 237m, short axis 230m, depth 54m oval spoke-type tension structure, the shape of the structure is the key to the design of the project. Based on the analysis of the mechanical characteristics of the vehicle-spoke tensioned structure, the resultant force line of the tension-pulling structure of the vehicle-spoke tensioning structure and the tension of the lower chordal line are formed on a curved surface to form the virtual structure of the combined force of the upper chord and the lower chord. Based on the relationship between the equilibrium load and the horizontal component of the tension force of resultant force line, the finite element formula for calculating the virtual structure shape of the resultant force line is given. According to the ratio of the virtual structure shape of the resultant force line and the horizontal components of the upper and lower chord tension, Upper and lower nodes; the shape of the whole vehicle spoke tension structure is determined according to the coordinates of both ends of the upper and lower chords of the cable trusses, the horizontal components of the cable tension, the tension of the slings and the node loads. The initial strain calculation formula and the treatment method of the elastic deformation of the boundary structure are given after structural analysis and cable tension control. The shape of the vehicle-spoke tensioned structure in Bao’an Stadium in Shenzhen is found. The method of finding the shape of the article is simple and accurate. It can be calculated by programming finite element program or through the existing finite element software.