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通过对2榀再生混凝土框架边节点进行低周反复荷载试验.其中,1榀构件以粉煤灰等量取代水泥,研究在不同胶凝材料下再生混凝土框架边节点的破坏形态,试验获得低周反复荷载下荷载-位移滞回曲线、骨架曲线及刚度退化情况;利用有限元软件ABAQUS对2榀再生混凝土梁柱边节点进行数值模拟.再生混凝土本构关系以普通混凝土本构模型为原型,结合再生混凝土材性试验进行修正,得到的相应本构关系及塑性损伤模型,能较好地模拟再生混凝土节点的受力状态.将试验结果与模拟结果进行了对比分析,结果表明,试件Mises应力云图、极限荷载、骨架曲线、刚度退化曲线模拟值与试验值吻合较好,证明了在ABAQUS中建立的模型能较好地模拟再生混凝土构件的力学行为.
Low-cycle repeated load tests were carried out on the edge joints of 2 榀 recycled concrete frames, in which 1 榀 member replaced the cement with fly ash equivalent, and studied the failure modes of the edge joints of recycled concrete frames under different cementitious materials. The load-displacement hysteresis curve, the skeleton curve and the stiffness degradation under repeated load are simulated.The finite element software ABAQUS is used to simulate the beam-column joint of 2 榀 recycled concrete beam.The constitutive relation of recycled concrete takes the ordinary concrete constitutive model as the prototype, Revised concrete material test, the corresponding constitutive relation and plastic damage model can well simulate the stress state of recycled concrete joints.The experimental results and the simulation results are compared and the results show that the Mises stress The simulation results of the cloud graph, the ultimate load, the skeleton curve and the stiffness degradation curve are in good agreement with the experimental values, which proves that the model established in ABAQUS can better simulate the mechanical behavior of recycled concrete members.