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介绍一个半刚性连接高层钢框架P-△效应分析的实用简化方法。以部分框架为分析子单元,用变刚度的转动弹簧模拟梁柱节点连接的半刚性,建立了考虑P-△效应的半刚性连接高层钢框架内力和位移计算的无迭代简化公式。算例表明,梁柱连接的半刚性确实降低了钢框架的抗剪刚度,明显增加了结构的水平位移和P-△效应,应当在高层钢框架的P-△效应分析中考虑半刚性连接的影响。该方法不仅简单实用,便于手算,而且精度较高,可供工程设计人员在半刚性连接高层钢框架设计时使用。影响半刚性连接高层钢框架P-△效应的主要因素是柱的抗剪刚度、梁与柱的线刚度之比、半刚性连接的类型和相应的连接刚度系数α值。
A practical and simplified method of P-effect analysis of semi-rigid high-rise steel frame is introduced. Taking the partial frame as the analysis subunit, the semi-rigid connection of the beam-column joints is modeled by the rotating spring with variable stiffness. The iterative simplified formula is established to calculate the internal forces and displacements of the semi-rigidly connected high-rise steel frame considering P-effect. The results show that the semi-rigidity of the beam-column connection does reduce the shear stiffness of the steel frame and obviously increases the horizontal displacement and P-Δ effect of the structure. The semi-rigid connection should be considered in the P- influences. The method is not only simple and practical, easy to calculate, but also high precision, which can be used by engineering designers in the semi-rigid connection of high-rise steel frame design. The main factors affecting the P- △ effect of the semi-rigidly connected high-rise steel frame are the column shear stiffness, the ratio of beam-column stiffness, the type of semi-rigid connection and the corresponding value of the joint stiffness coefficient α.