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利用大型有限元分析软件ANSYS对双腹板、顶底角钢半刚性连接的钢框架进行了三维弹塑性动力有限元分析。该分析采用了有限元实体建模,考虑了钢框架连接节点的非线性、几何非线性以及材料非线性等因素。通过有限元数值模拟分析得出了在地震荷载作用下,半刚性节点刚度的变化对钢框架的基本自振周期、楼层剪力、楼层位移、楼层加速度和节点的弯矩-转角关系的影响规律,并将部分数值模拟分析结果与拟动力试验结果进行对比,发现这两种研究方法所得结果基本一致。通过该文的分析,得出了节点刚度的变化对结构动力特性影响的一般规律,为今后高层钢结构设计和钢结构规范的修改提供了一定的理论依据。
The finite element analysis software ANSYS was used to analyze the three-dimensional elasto-plastic dynamic finite element analysis of the semi-rigidly connected steel frame with double webs and top and bottom angles. The analysis uses finite element solid modeling, taking into account the steel frame connection node nonlinear, geometric nonlinear and material nonlinearities and other factors. The influence of the change of the stiffness of semi-rigid joints on the fundamental natural vibration period, floor shear force, floor displacement, floor acceleration and moment-moment relationship of the joints under seismic load was obtained by finite element numerical simulation , And compared the results of numerical simulation with those of pseudo-dynamic test. The results obtained by these two methods are basically the same. Through the analysis of the paper, the general rule that the influence of the change of the node stiffness on the dynamic characteristics of the structure is obtained, which provides a theoretical basis for the future high-rise steel structure design and modification of the steel structure code.