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采用静力凝聚法将框架简化为杆系-层间剪切模型,基于框架动力响应时程分析计算的时间步内一阶位移增量,根据D’Alembert原理导出竖向力附加弯矩相应产生的加速度激励增量,由此建立迭代计算格式考虑P-Δ效应对框架位移、速度和加速度的影响,并嵌入时程分析过程。最后通过算例检验文中方法的可行性,并考察P-Δ效应对框架地震响应全过程的影响。
The frame is simplified to the rod-layer shear model by static cohesion method. Based on the first-order displacement increment in the time step calculated by the dynamic response time-history analysis of the frame, the additional moment of vertical force is derived according to the principle of D’Alembert The acceleration excitation increment is thus established. The iterative calculation format is established to consider the influence of P-Δ effect on the frame displacement, velocity and acceleration, and embedded in the time history analysis process. Finally, an example is given to verify the feasibility of the proposed method and to investigate the effect of P-Δ on the whole process of the seismic response of the frame.