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为了探讨高层钢结构中框架 -支撑体系二阶分析的简捷算法 ,本文从简化结构分析模型入手 ,通过刚度等效原则 ,将支撑和框架的二阶效应分别等效为各自的负刚度 ,将支撑斜杆的抗剪作用等效为楼盖处的弹簧 ,并通过合成法将框架 -支撑体系等效为剪切型等效柱与弯曲型等效柱的并联模型。从而可按一阶分析方法建立结构的刚度方程并求解。该法可避免常规二阶分析的反复迭代 ,计算速度快 ,所用机时少。文末通过数值算例检验了该模型的适用性和可靠性。
In order to study the simple and efficient method of second-order analysis of frame-support system in high-rise steel structure, starting from the simplified structure analysis model, the second-order effect of support and frame is equivalent to the negative stiffness respectively, The diagonal shear effect is equivalent to the spring at the floor, and the frame-support system is equivalent to the parallel model of the shear equivalent and the curved equivalent by the synthesis method. Thus the first-order analysis method can be used to establish the stiffness equation of the structure and solve it. The method can avoid repeated iterations of the conventional second-order analysis, the calculation speed is fast, and the machine time is less. At the end of this paper, we verify the applicability and reliability of the model through numerical examples.