装配式桥墩抗震性能分析

Analysis on Seismic Performance of Prefabricated Bridge Piers

基于抗震性能及施工的需求,提出了一种新型装配式桥梁连接方法,在连接端头预埋圆形型钢,通过焊接连接,对比灌浆套筒、金属波纹管的其他构造,该连接方法施工方便,操作容易,施工速度更加快速。通过对型钢连接方式的试验研究,主要得出以下结论:(1)型钢连接的装配式桥墩与现浇桥墩破坏均为弯曲破坏。型钢连接的装配式桥墩柱根处破坏程度较轻,混凝土破坏主要集中在预埋钢管顶部以上。(2)型钢连接的装配式桥墩承载能力高于现浇桥墩。(3)型钢连接的装配式桥墩与现浇桥墩的残余位移相当,但在耗能能力及延性方面前者的表型更好。(4)型钢连接的装配式桥墩具有优越的抗震性能,为装配式桥墩在高烈度地震区的使用提供一种方法。

Based on the seismic performance and construction requirements,a new type of prefabricated bridge connection method is proposed.The round steel is embedded in the connecting end and connected by welding.Through the comparison with the other structures of grouting sleeves and metal bellows,it is found that this connection method is convenient in construction,easy to operateand faster in construction.Through the experimental study on the connection mode of section steel,the following conclusions are mainly given that(1)The failure of prefabricated piers connected with cast-in-situ piers by section steel is the bending failure.The damage degree at the root of the prefabricated pier column connected by section steel is relatively light,and the concrete damage is mainly concentrated above the top of the embedded steel pipe.(2)The bearing capacity of prefabricated piers connected by section steel is higher than that of cast-in-place piers.(3)The residual displacement of prefabricated pier connected with section steel is equivalent to that of cast-in-place pier,but the former is better in terms of energy dissipation capacity and ductility.(4)The prefabricated pier connected by section steel has the superior seismic performance,which provides a method for the use of prefabricated pier in high seismic intensity areas.