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节点刚度不仅影响网壳的静力性能,对网壳的动力性能也有一定的影响.为认识其对网壳动力性能的影响规律,本文应用ANSYS中的Matrix27单元建立节点刚度单元模型,研究了节点刚度变化时网壳动力性能的相应变化.采用动力时程分析法研究了不同节点刚度对网壳地震响应的影响.计算结果表明,节点的轴向刚度和弯曲刚度对网壳的自振特性和地震响应均有一定的影响,实际工程中考虑节点刚度的影响能更准确地反映结构真实性能.
The stiffness of the joint not only affects the static performance of the shell, but also affects the dynamic performance of the shell.In order to understand its influence on the dynamic behavior of the shell, Matrix27 element in ANSYS is used to establish the element model of the node stiffness, The influence of different joint stiffness on the seismic response of the reticulated shell is studied by dynamic time history analysis.The results show that the axial stiffness and bending stiffness of the joint have significant influence on the natural vibration characteristics of the reticulated shell and Earthquake response have a certain impact, the actual project to consider the influence of node stiffness can more accurately reflect the real structure performance.