钢筋混凝土延性桥墩震后快速修复技术研究

Research on rapid repair techniques for earthquake damaged ductile RC bridge piers

采用3种不同修复方案对3个发生严重破坏的钢筋混凝土延性桥墩进行震后快速修复技术研究.试件首先在固定的轴力和侧向反复荷载下进行拟静力试验使之发生弯曲延性破坏,然后分别利用植筋、浇筑套箍、缠绕CFRP等方法对其进行快速修复并重新进行加载试验.试验结果表明,采用不同方案修复的桥墩承载力和延性指标均能得到较好恢复甚至提高,由于内部损伤的存在,修复后桥墩的初始刚度较低;缠绕CFRP修复的试件,由于施工简单,修复效果较好且造价较低,可在工程实际中推广.

An experimental study on three severely earthquake damaged ductile RC bridge piers was carried out to evaluate the feasibility of three available rapid repair techniques for bridge piers. The piers were initially severely damaged subjected to pseudo-static cyclic lateral loading while the axial load holded constant. Then the damaged piers were repaired with three different techniques by using additional bars, jacketing and CFRP sheets. The repaired specimens were tested again under the same loads. The results indicate that all the repaired specimens have similar or even more load-carrying capacity and ductile behavior compared with the original ones, and the initial stiffness of all the repaired piers is lower than that of the original ones as a result of the pre-existing damage in the tested piers; the specimen repaired by using CFRP sheets should be used in engineering practice for its simple operation technology, good repair effect and low cost.