外置钢板对套筒连接装配式桥墩抗震性能影响的试验研究

Experimental Study on the Influence of External Steel Plates on the Seismic Performance of Sleeve-Connected Fabricated Bridge Piers

为了提高灌浆套筒置于承台基础中装配式桥墩的抗震性能,采用外置钢板对其加固,并制作未加外置钢板的装配式桥墩和现浇桥墩作对比,开展振动台试验。对三种桥墩的动力特性,加速度和位移响应进行测试并分析。结果表明:各个桥墩均为受弯破坏。三种桥墩加速度和位移响应虽有一定差异但表现形式相似。加载结束时,外置钢板桥墩的自振频率最大,刚度最大,损伤最小。外置钢板加强了装配式桥墩核心混凝土约束,使得整体抗震性能有所提高,是一种有效提升装配式桥墩抗震性能的方式。

To improve the seismic performance of fabricated piers with grouted sleeves placed in the foundation of the bearing, external steel plates were used to reinforce them and shaking table tests were carried out to compare fabricated piers without external steel plates with cast-in-place piers. The dynamic characteristics, acceleration and displacement responses of the three piers were tested and analysed. The results show that all piers are subject to bending damage. The acceleration and displacement responses of the three piers were different but similar in form. At the end of the loading, the external steel plate pier has the highest self-vibration frequency, the highest stiffness and the least damage. The external steel plates strengthen the core concrete restraint of the fabricated piers and improve the overall seismic performance, which is an effective way to improve the seismic performance of the fabricated piers.