基于ABAQUS的钢筋混凝土柱拟静力分析

Pseudo-Static Analysis of Reinforced Concrete Columns Based on ABAQUS

基于混凝土的单轴塑性损伤本构及钢材的弹塑性混合强化本构,应用ABAQUS软件建立拟静力荷载下钢筋混凝土柱的有限元模型,建模时充分考虑混凝土与纵筋、箍筋的约束关系及合理的边界条件与加载制度。对比有限元中的荷载-位移滞回曲线、骨架曲线、刚度退化-位移曲线结果与试验结果,两者吻合较好,并进一步深入分析了柱混凝土、钢筋的应力-应变特征以及塑性耗能分配机制。结果表明:当轴压比增大时,各部件的压应变峰值及总塑性耗能值明显增大,且混凝土的塑性耗能占比增大,柱更易被压碎;其次,由于箍筋间距的增大,试件的延性明显降低,加载时间明显减小,总塑性耗能降低;最后,当纵筋屈服强度增大时,混凝土、纵筋的压应力峰值增大,压应变变化不明显,对箍筋的压应变、压应力影响较小。

Based on the uniaxial plastic damage constitutive of concrete and the elastic-plastic mixed strengthening constitutive of steel,the finite element model of reinforced concrete column under pseudo-static load is established by using ABAQUS software.The constraint relationship between concrete and longitudinal reinforcement and stirrup,reasonable boundary conditions and loading system are fully considered in the modeling.Comparing the results of load displacement hysteretic curve,skeleton curve and stiffness degradation displacement curve in finite element with the test results,they are in good agreement.Furthermove,the stressstrain characteristics and plastic energy consumption distribution mechanism of column concrete and reinforcement are analyzed.When the axial compression ratio increases,the peak compressive strain and total plastic energy consumption of each component increase significantly,and the proportion of plastic energy consumption of concrete also increases,which make the column easier to be crushed.Moreover,due to the increase of stirrup spacing,the ductility of the specimen,the loading time,and the total plastic energy consumption decreases obviously.Lastly,when the yield strength of longitudinal reinforcement increases,the peak value of compressive stress of concrete and longitudinal reinforcement increases,and the change of compressive strain is not obvious,which has little effect on the compressive strain and compressive stress of stirrup.