碳纤维布提高高强混凝土柱抗震能力评估方法

Anti-Seismic Performance Evaluating Method of High Strength Concrete Columns Retrofitted with CFRP Fabric

针对利用碳纤维布加固既有建筑中的高强混凝土柱,以及加固后抗震性能的评估问题,对 7根高强混凝土柱进行试验研究,分析了碳纤维布约束高强混凝土的影响因素和约束机理.通过理论推导和统计回归的方法,提出了碳纤维布加固高强混凝土柱位移延性比的理论计算方法和基于两个回归公式的简化计算方法.两种计算方法概念清晰,简便适用,分析结果与试验值的相对误差控制在 2000左右,可以满足抗震加固设计的要求.两个回归公式的决定系数R2 分别为 0. 97和 0. 99,具有很高的拟合精度,可用于碳纤维布约束混凝土柱的相关研究.

In order to strengthen the existing concrete columns with advanced carbon fiber reinforced polymer(CFRP)for seismic resistance and evaluate the anti-seismic behavior of these hybrid columns, experimental investigations on seismic performance of high strength concrete columns retrofitted with CFRP fabric are presented, and the action mechanism of CFRP fabric to high strength concrete columns is also discussed.A theoretical analysis approach is proposed to calculate the ductility coefficient of the strengthened specimens.In order to make this method convenient to the seismic design of hybrid columns, a simplified method with two regressive formulas is proposed.In comparison with results computed with both methods suggested in this paper and the test results, it is found that a reasonable agreement has been achieved.These two methods can be used to evaluate the anti-seismic performance of high strength concrete columns retrofitted with CFRP fabric.The two regressive formulas, with the correlation coefficients of 0.97 and 0.99 respectively, have well fitness to be used in research and design on concrete columns wrapped by CFRP.