灌浆套筒连接装配式混凝土双柱墩的双向拟静力试验研究

Bi-axial quasi-static test on grouting sleeve connected assembled concrete double-column piers

灌浆套筒连接装配式混凝土双柱墩在桥梁结构中大量应用,但在多向荷载作用下的抗震性能研究缺乏深入认识。本文开展了灌浆套筒连接装配式双柱墩的双向拟静力试验,研究了其破坏模式、滞回特性、刚度退化和延性性能等,并与现浇墩进行了比较。分析了装配式混凝土双柱墩等效计算高度的取值和动轴力的影响,讨论了墩顶位移计算方法。结果表明,在强轴方向,装配式双柱墩的耗能、强度、变形性能和延性等与现浇墩基本接近,而在弱轴方向这些指标明显小于现浇墩。理论计算得到了墩顶极限位移约为实测值的86.8%,具有较好的计算精度,但计算结果偏保守。

Segmental concrete double-column bridge piers are widely used in bridges,but their seismic performance under multi-directional action is still lack of understanding.A bidirectional pseudo-static test for the grouting sleeve connected segmental concrete double-column bridge pier was carried out.The failure mode,hysteretic behavior,stiffness degradation,and ductility were studied and compared with those of the cast-in-place piers.The influence of the equivalent calculation height and dynamic axial force of the segmental concrete double-column pier was further analyzed,and the calculation method of the displacement at the top of the double-column bridge pier was discussed.The results show that the energy consumption,strength,deformation performance and ductility of the segmental double-column pier are similar to those of the cast-in-place pier in the direction of strong axis,but are obviously smaller than those of the cast-in-place pier in the direction of weak axis.The theoretical ultimate displacement of the pier top is about 86.8%of the measured one,which indicates the good calculation accuracy,although the calculation results are relatively conservative.