灌浆套筒承插组合连接装配式墩压弯扭滞回性能分析

Analysis of compressive bending torsional hysteresis performance of grouting sleeve socket and socket assembly connection assembled pier

为了得到斜、弯桥等非规则桥梁的预制拼装桥墩压弯扭复合作用下的滞回性能,对一种灌浆套筒和承插口组合连接的装配式墩进行了有限元参数分析。首先介绍了装配式桥墩的拟静力试验,然后建立相应的有限元模型并利用试验结果验证其有效性,最后研究了轴压比、扭弯比、配箍率和配筋率等参数对装配式墩压弯扭滞回性能的影响。研究结果表明,增大构件的轴压比可以提高其抗弯、扭的承载力,但耗能能力会因此降低。提高扭弯比,构件的抗弯承载力将会迅速降低,而其扭转耗能和抗扭承载力将会提高;增大构件的配筋率,可以提高其抗弯承载力,但抗扭承载力和刚度变化较小;增大构件的配箍率,可以提高其刚度和抗弯、抗扭承载力。研究结果可以为灌浆套筒和承插口组合连接桥墩的复合受力性能分析和工程应用提供参考。

In order to obtain the hysteretic behavior of precast assembled piers of irregular bridges such as skew and curved bridges under the combined action of compression-bending-torsion,the finite element parameters analysis of a fabricated pier with grouting sleeve and socket mortise joints was carried out.Firstly,the general situation of quasi-static test of the new type prefabricated pier was introduced,then the finite element model was established and analyzed.Finally,the effects of parameters such as axial compression ratio,torsional bending ratio,stirrup ratio and reinforcement ratio on its compression bending torsion hysteretic behavior was studied.The research results show that increasing the axial compression ratio of the member can improve its flexural and torsional bearing capacity,but the capacity of energy dissipation will be reduced.When the torsion-bending ratio was increased,the flexural bearing capacity of the component will decrease rapidly,while its torsional energy dissipation and torsional bearing capacity will increase.Increasing the reinforcement ratio of the member can improve its flexural bearing capacity,but the variation of the torsional bearing capacity and stiffness were small.Increasing the stirrup ratio of the member can improve its stiffness and flexural and torsional bearing capacity.The results of this research can provide a reference for the composite force analysis and engineering application of prefabricated piers.