梯级CFRP筋多塑性铰混凝土桥墩抗震性能研究

Seismic Vulnerability Analysis of Multi-plastic-hinge Concrete Bridge Piers Based on Graded CFRP Bars

基于CFRP筋的梯级配筋方式,对混凝土桥墩进行多塑性铰抗震设计。采用OpenSees程序建立桥墩数值模型,并通过拟静力数值模拟分析多塑性铰设计方法下桥墩的滞回性能。研究结果表明:相较于普通钢筋混凝土桥墩,多塑性铰桥墩具有更加良好的的滞回特性;与CFRP筋通长配筋桥墩相比,梯级CFRP筋桥墩的最大侧向承载能力和刚度却只有微小幅度的下降,但其墩顶极限位移、延性性能和累计耗能却有较大提高;桥墩中塑性铰数量越多,则桥墩的滞回性能越好。

Based on the graded CFRP bar reinforcement,the multi-plastic hinge seismic design of concrete bridge piers was carried out.The pier numerical model is built by OpenSees program,and the hysteretic behavior of the pier is analyzed by quasi-static numerical simulation.The results show that the multi-plastic hinge pier has better hysteretic behavior than the common reinforced concrete pier,and the multi-plastic hinge pier has better hysteretic behavior than the CFRP-reinforced pier.However,the maximum lateral bearing capacity and stiffness of the graded CFRP reinforced pier decrease slightly while the maximum horizontal displacement,ductility and cumulative energy dissipation phase at the top of graded CFRP reinforced pier increase greatly.Finally,the more plastic hinges there are in the pier,the better the hysteretic performance of the pier will be.