钢板-混凝土组合连梁抗震性能有限元分析

Nonlinear finite element analysis on the seismic behavior of plate-reinforced composite coupling beams

采用有限元软件对钢板-混凝土组合(PRC)连梁抗震性能进行了数值模拟,通过与试验结果的对比,验证了模型的正确性.通过大量的数值模拟,研究了跨高比、钢板锚固长度、钢板厚度、纵筋配筋率和墙肢配筋率等参数对钢板-混凝土组合连梁抗震性能的影响.结果表明:采用混凝土应力-断裂能关系来考虑混凝土受拉软化性能,能较好的进行钢板-混凝土组合连梁的弹塑性有限元分析;跨高比的变化对其屈服荷载和峰值荷载影响显著,随着跨高比的增大,连梁的屈服荷载和峰值荷载逐渐减小,但其延性性能逐渐提高;连梁的承载力和刚度随钢板锚固长度、钢板厚度和纵筋配筋率的增加而增加,但其增加的程度随连梁跨高比的减小而减小;连梁的承载力随墙肢配筋率的增加逐渐增大,增加的程度随墙肢配筋率的增加而减小.

Seismic behavior of plate-reinforced composite（PRC） coupling beams was simulated based on the finite element software,and the calculated results were compared with those of the experiments to ensure the correcteness of the simulation model.Furthermore,with abundant simulations,span-to-depth ratio,plate anchorage length in the wall region,plate thickness,longitudinal reinforcement ratio of beam and wall reinforcement ratio were all considered to analyse the effect on seismic behavior of PRC coupling beams.The results show that the tension softening property of concrete was simulated based on the relationship between stress and fracture energy,and the elastic-plasticity finite element analysis of the model was better conducted.The effects of changes of span-to-depth ratios on yield loads and peak loads of the coupling beams are significant.The yield loads and peak loads of PRC coupling beams gradually decrease with the increase of span-to-depth ratios,but their ductility performance is gradually improved.The load bearing capacity and stiffness of the coupling beams increase with the plate anchorage lengths,plate thicknesses and longitudinal reinforcement ratios,but the effects diminish as the span-to-depth ratios of coupling beams decrease.The load bearing capacity of the coupling beams increase with the increaseing wall reinforcement ratios,but the effects diminish as the wall reinforcement ratios increase.