设置延性系梁的桥梁双柱墩抗震能力研究

Study of Seismic Resistance Capacity of Double-Column Bridge Pier Arranged with Ductile Tie Beam

为研究设置延性系梁对减少桥梁双柱墩横桥向地震损伤的效果,基于OpenSees数值分析平台,建立了无系梁和设置延性系梁的双柱墩抗震数值分析模型,通过拟静力和增量动力分析手段对2种双柱墩在地震作用下的反应进行研究,讨论了延性系梁设置对双柱墩地震反应的影响。结果表明:延性系梁提高了桥梁双柱墩横桥向的强度和刚度,地震作用下,系梁先于桥墩发生屈服,形成塑性铰并耗散地震能量,延缓了桥墩的损伤破坏过程,并减少了桥墩的曲率延性系数和墩顶的最大位移角。

To study the effect of the ductile tie beam arranged for double-column bridge pier on reducing the transverse seismic damage to the pier, the numerical analysis models for the seis- mic resistance of the double-column bridge piers without and arranged with the ductile tie beam were built based on the OpenSees analysis platform. By means of the quasi-static and incremental dynamic analysis, the responses of the two kinds of the piers under the seismic action were stud- ied and the effect of the tie beam on the seismic response of the pier was discussed. The results of the study show that the ductile tie beam can increase the transverse strength and rigidity of the double-column bridge pier. Under the seismic action, the tie beam yields before the pier will do and the tie beam acts as a kind of the plastic hinge and dissipates the seismic energy, which in turn retards the damage process of the pier and also decreases the curvature ductility factor of the pier and the maximum drift ratio of the top of the pier.