基于有效粘贴长度的纤维片材加固RC梁斜截面计算方法

Calculation method of strengthened RC beam oblique section with FRP based on the effective pasting length

针对目前各国规范标准关于纤维片材加固钢筋混凝土梁斜截面推荐公式,对影响加固效果的关键因素考虑不足.基于纤维片材有效粘贴长度及粘贴层滑移特性,并引入纤维间应力分布系数、初始荷载修正系数及纤维有效应力折减系数,给出了一种新的纤维加固钢筋混凝土斜截面计算公式.最后,在收集60片纤维片材加固钢筋混凝土梁斜截面试验数据基础上,应用统计学原理对本文推荐公式及ACI440等建议公式预测结果进行对比分析.结果表明,该推荐公式预测结果较其他公式准确有效,并对该领域的进一步研究有一定借鉴意义.

Present study is aimed at the insufficient consideration of some key factors of recommended formula of the various countries standard about strengthened RC beam oblique section with FRP at present. Based on the effective bond length of FRP and the slipping characteristic of bond layer, the paper introduced FRP stress distribution coefficient, initial stress revise coefficient and FRP stress reduction coefficient, then provided a kind of new formula of strengthen RC beam oblique section finally. Based on the collection of 60 RC beam test data where oblique section is strengthened with FRP. It also predicted the result of the recommendation formula of this text and presented guide for the design and construction of externally bonded FRP systems for strengthening concrete structures （AC1440）etc. The result indicates, the predicted results of this text are accurate and effective to other formula, and there are certain reference meanings to the further research in this field.