基于混合试验的桥墩FRP抗震加固破坏机理研究

Research on the failure mechanism of seismic strengthening of bridge piers with FRP based on hybrid test

FRP抗震加固可以提高构件的延性,但同时也可能会改变构件的薄弱部位,乃至改变构件的破坏机理,甚至影响到整个结构。针对此问题,以钢筋混凝土连续梁桥为模型,假定其中一个桥墩因为施工间断等原因造成桥墩底部钢筋部分搭接,需要进行FRP抗震加固,通过抗震混合试验方法,研究此加固桥墩在地震荷载作用下的破坏情况。结果表明:FRP抗震加固对于构件的延性有着很大的提高,但同时也可能会改变构件的破坏机理。

Seismic strengthening with FRP can improve the ductility of the component, but at the same time, it may change the weak parts of the component, then change the failure mechanism of the component, sometimes even affect the whole structure.To solve this problem, this paper usea reinforced concrete continuous beam bridge as the model, assumethat one of the piers need to carry outseismic reinforcementwith FRP because of the construction of intermittent and other reasons caused the bottom of the bridge pier partial lap joint. The damage of bridge pier under seismic load is studied through the method of hybrid test. The results show that the ductility of the member is greatly improved by seismic strengtheningwith FRP, but it may also change the failure mechanism of the component.