板锥柱面网壳结构的试验研究与有限元分析

为研究板锥网壳结构的实际承载能力和破坏全过程，了解结构的受力性能和整体刚度，对板锥柱面网壳结构进行模型试验研究。对试验模型的细部构造进行设计，确定上弦节点、下弦节点、支座节点、锥体成形及连接构造。对两纵边支承的试验模型在正常荷载工况和破坏荷载工况下进行加载试验，并采用ANSYS软件对试验模型进行非线性有限元分析。结果表明：板锥柱面网壳的整体刚度大，在正常荷载模式下，结构的变形很小，最大竖向位移与跨度的比值为1/3787，弦杆的受力主要是沿拱轴方向传递；在破坏荷载模式下，锥体的节点板连接处率先发生局部屈曲，之后焊点破坏，结构丧失承载能力。有限元与试验所得承载力最大误差为11%，破坏模式基本一致，所用有限元分析方法可靠。

Experimental research and finite element analysis of plate-cone cylindrical reticulated shell

In order to study the bearing capacity and the failure process of the plate-cone cylindrical reticulated shell structure, and understand the mechanical performance and overall stiffness of the structure, a model test on the plate-cone cylindrical reticulated shell structure was carried out. The crucial members including the upper chord node, lower chord node, support node, cone forming and connection structure were designed to ensure the accuracy of the model structure. Loading tests were carried out on the model structure supported by two longitudinal sides under normal load conditions and failure load conditions, and ANSYS software was used to perform nonlinear finite element analysis. The results indicate that the overall stiffness of the plate-cone cylindrical reticulated shell is large. Under the normal load, the deformation of the structure is small, the ratio of maximum vertical displacement to span is 1/3787, and the force of the chord is mainly transmitted along the direction of the arch axis. Under the failure load, local buckling occurs first at the gusset plate of the cone connection joint. Then the solder joint is damaged, and the structure loses bearing capacity. The error between the bearing capacity obtained by the finite element analysis and the bearing capacity obtained by the test is 11% , and the failure mode is basically the same. It can be seen that the finite element analysis method used in this paper is reliable.