不同轴力下钢筋混凝土框架柱的力学性能分析

Analysis of Mechanical Properties of Reinforced Concrete Frame Columns Under Different Coaxial Forces

文中利用有限元法分析不同轴力对钢筋混凝土框架柱力学特性的影响。结果表明,节点位移与模拟位移的时程响应曲线相对一致,证实了所建模型的准确性;钢筋混凝土框架柱节点处所有的滞回曲线均相对饱满;当轴力从5 kN提升至20 kN,钢筋混凝土框架柱耗散能系数的降低速率约0.015,轴力每增加1 kN,屈服荷载和极限荷载分别降低2.27 kN、2.33 kN,延性系数的降低速率约0.0053。上述研究为钢筋混凝土框架柱的改善提供了合理的方法。

In order to analyze the mechanical response of reinforced concrete frame column joints when an earthquake is coming,the finite element method is used to analyze the influence of different coaxial forces on the mechanical properties of reinforced concrete frame columns.The results show that the time-history response curves of node displacement and simulated displacement are relatively consistent,which confirms the accuracy of the model.The hysteresis curves of reinforced concrete frame column joints are relatively full.When the axial force is increased from 5 kN to 20 kN,the reduction rate of dissipative energy coefficient of steel-reinforced concrete frame column is about 0.015,for each 1 kN increase in axial force,the yield load and limit load decrease 2.27 kN,2.33 kN,respectively,and the reduction rate of ductility coefficient is about 0.0053.The above research provides a reasonable method for the improvement of reinforced concrete frame column.