玄武岩纤维加固震损三维混凝土框架节点抗震试验

Experimental Study on BFRPreinforced Predamaged Concrete BeamColumn Joints by Simulated Earthquake

摘要:

通过5组三维混凝土框架节点试验,研究玄武岩纤维加固后节点的抗震性能.分别进行了模拟地震的预损伤试验、构件加固和加固后的低周反复试验,探讨不同损伤程度、不同裂缝处理方法对三维框架节点抗震性能的影响.通过对节点的滞回&骨架曲线、延性系数、承载力及刚度退化等参数分析可知：玄武岩纤维加固对提高节点承载力作用有限,但对提高抗震性能效果明显,节点的抗震性能恢复并超过了受损前,加固后节点由“弱柱强梁”转变成了“强柱弱梁”的破坏形式,说明该加固方法是合理而有效的.

Abstract:

A total of five repaired beamcolumn joints(BCJs) were predamaged under cyclic loads in order to study on the seismic behavior.The experimental study including predamage,rehabilitation and retest under cyclic loads concentrated on the effect on different levels of predamage and epoxy injection.Through the test data,namely the hysteresis curves,ductility,ultimate strength and stiffness degradation,etc,the following conclusion is drawn that the rehabilitation with basalt fiber sheets has notable influence on the seismic performance of joints,but ultimate loads limited.The repaired BCJs can reach or even exceed the level of their original seismic performance before predamage.The failure mode of strong beam and weak column is changed into strong column and weak beam after rehabilitations.The proper method is used in need for strengthening the damaged joints.