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结合双跨梁的显式简化模型与能量平衡的原理,提出钢框架连续倒塌的简化非线性分析方法.将多层钢框架结构简化为双跨梁,求双跨梁在集中荷载作用下的显式简化模型,并对梁端转动刚度和轴向刚度进行修正,根据内力变化将双跨梁的受力分为4个阶段,推导了其在不同阶段的荷载-跨中挠度计算公式.以不同跨数不同层数的两个二维框架为例,采用简化方法预测柱失效后的最大位移,并与其他相同框架的非线性动力分析结果进行对比,表明采用本文方法可以取得准确结果,且分析过程简单.
Combined with the explicit simplified model and energy balance principle of double span beam, a simplified nonlinear analysis method of continuous collapse of steel frame is proposed. The multi-story steel frame structure is simplified as double span beam, The model is simplified, and the rotational stiffness and axial stiffness of the beam end are corrected. According to the internal force variation, the stress of the double-span beam is divided into four phases, and the formulas of load-span deflection at different phases are derived. Taking two two-dimensional frames spanning different layers as an example, the simplified method is used to predict the maximum displacement after column failure, and compared with other nonlinear dynamic analysis results of the same frame, which shows that the accurate results can be obtained by this method and analyzed The process is simple.