中文摘要：

研究空间钢框架力学模型中,梁柱连接刚度和层高的变化对结构抗震抗风自振周期的影响。采用ANSYS中combine单元来模拟梁柱的半刚性连接,在三维空间模型中,通过建立不同的连接模型,分析结构固有特性,得到不同的梁柱连接刚度系数对空间钢结构自振周期的影响规律。仿真计算表明,梁柱连接刚度变化对自振周期影响较大;此外,分析了层高变化对自振周期的影响。在此基础上,得到（小）高层塔形钢结构的抗震抗风自振周期随梁柱连接刚度系数和层高的变化曲线,为工程设计进行抗震抗风分析提供参考。

英文摘要：

The effects of the stiffness of semi-rigid connection between 0cams anu the variation of story height on the natural vibration period of the structure under seismic and wind loads were studied. The ＂combine＂ elements in ANSYS were used to simulate the semi-rigid connections between the beams and the columns. Different connection models were then established in the spatial frame models to analyze the structural intrinsic characteristics and the effects of various beam-column connection stiffness coefficients on the natural vibration period of the spatial steel structures. The simulation results indicate that the change of the connection stiffness coefficients has great influence on the structural natural vibration period. The effects of story height were also analyzed. Finally, the curves of the natural vibration period of multi-layer tower steel structure vs. connection stiffness coefficients and story height were plotted, which may provide a reference for the seismic and wind analysis of engineering structures.