新型铁路重力式加固墩试验分析

Experimental Analysis on Seismic Behavior of New Type of Railway Gravity Strengthened Pier

为研究新型钢加固铁路重力式桥墩的抗震性能,以某简支梁少筋混凝土桥墩为工程背景,制作了新型加固墩的缩尺试验模型.通过水平向输入El-Centro波进行振动台试验,对比分析了墩顶水平位移及加速度时程曲线.结果表明:加固墩的破坏裂缝没有向上转移,主裂缝仍然在墩底,在强震作用下没有发生提离摇摆或竖向提离现象,新型加固墩具有较好的抗震性能.

In order to study the anti-seismic performance of a new type of steel-reinforced railway gravity pier,and taking a simply supported concrete bridge pier with less reinforcement as the engineering background,a new scale test model of reinforced pier is made.The shaking table test is carried out by inputting El Centro wave horizontally,and the horizontal displacement and the acceleration time-history curve of the pier top are compared and analyzed.The results show that the broken crack of the reinforcing pier is not transferred upwards,and the main crack is still at the bottom of the pier.Under the action of strong earthquakes,there is no phenomenon of lifting swing or vertical lifting.The new type of strengthened pier has good seismic performance.