基于OpenSees的RC平面框架抗倒塌试验模拟与分析(之一)

The simulation and analysis of the plane RC frame collapse-resistant test based on OpenSees

基于OpenSees分析平台,以位移控制方法加载,对湖南大学平面框架抗倒塌试验进行非线性静力抗倒塌数值模拟,验证了OpenSees几何非线性分析方法及约束处理方法的有效性。给出梁柱构件的轴力图,分析梁、柱截面弯矩-曲率、P-M相关曲线,确定了基于变形的屈服准则,通过对模拟结果的后处理得出了平面框架的塑性铰分布及发展情况;提取梁柱单元内力,根据轴力及弯矩包络曲线考察梁柱内力变化规律。通过数值分析,深入探讨了框架结构的抗倒塌机制和抗力分布情况。

Based on the analysis platform of OpenSees, the collapse-resistant test of plane reinforced concrete frame of Hunan University was simulated by the method of non-linear static analysis and the displacement-control load mode was used. The efficiency of geometrically nonlinear analysis and constraint treatment of OpenSees was verified. The axial force diagrams of beam and column were given,the moment-curvature curve and P-M curve were analyzed, and the yield criterion based on deformation was established; the plastic hinge distribution and development of plane framework were obtained through the post-processing of simulation results. The internal force of beam and column were extracted to investigate the change law of internal force about beam and column through axial force and moment envelope curve. The collapse-resistant mechanism and the resistance distribution was explained more clearly through numerical analysis.