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设置高温中和高温后不同的钢筋笼,用以区分高温中和高温后模型的异同,利用ABAQUS损伤塑性模型考虑混凝土损伤的积累,建立模拟高温中荷载对高温后钢筋混凝土梁受剪承载力影响的三维有限元分析模型。通过与试验结果的对比,验证了该模型具有较好的精度。采用该模型分析高温中不同荷载水平及作用位置对高温后钢筋混凝土梁受剪承载力的影响,结果表明:随着高温中荷载的增加,高温后钢筋混凝土梁受剪承载力降低;当高温中荷载小于其极限荷载的0.6倍时,受剪承载力降低较小,当高温中荷载大于其极限荷载0.6倍时,降低明显;对于高温中和高温后作用点相同的情况,剪跨比越小,受剪承载力下降越大;随着高温中荷载的增加,残余应变增大,但高温后刚度变化较小。
The different reinforcement cages were set up to neutralize the high temperature and high temperature to distinguish the similarities and differences of the models after high temperature and high temperature. The ABAQUS damage plastic model was used to consider the accumulation of concrete damage and establish the effect of mid-temperature load on the shear capacity of reinforced concrete Dimensional finite element analysis model. The comparison between the experimental results and the experimental results shows that the model has better accuracy. The model was used to analyze the influence of different load levels and locations on the shear strength of reinforced concrete beams after high temperature. The results show that the shear capacity of reinforced concrete beams decreases with the increase of load at high temperature. When the load is less than 0.6 times of the ultimate load, the decrease of the shear strength is small. When the load at high temperature is more than 0.6 times of the ultimate load, the decrease is obvious. For the same point of action after high temperature and high temperature, the shear span ratio is smaller , The larger the decrease of shear strength is. With the increase of the load in high temperature, the residual strain increases, but the stiffness changes little after high temperature.