外贴CFRP增强钢筋混凝土梁许用剥离应变研究

doi:10.16265/j.cnki.issn1003-3033.2018.07.012

中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (7): 70-75.doi: 10.16265/j.cnki.issn1003-3033.2018.07.012

外贴CFRP增强钢筋混凝土梁许用剥离应变研究

徐俊艳教授, 郑彬彬讲师, 李贵炳^** 教授

山东工商学院管理科学与工程学院,山东烟台 264005

收稿日期:2018-03-20 修回日期:2018-04-26 出版日期:2018-07-28 发布日期:2020-11-25
通讯作者: **李贵炳(1964—),男,山东莱阳人,博士,教授,主要从事CFRP增强混凝土结构、预应力CFRP体系等方面的研究。E-mail:liguibing@zju.edu.cn。
作者简介:徐俊艳(1965—),女,河北沧州人,博士,教授,主要从事CFRP增强混凝土结构、预应力CFRP锚具等方面的研究。E-mail:xjy2006988@163.com。
基金资助:
山东省自然科学基金资助(ZR2017MEE019)。

Allowable debonding strain limitation ofexternally CFRP-strenghtened RC beam

XU Junyan, ZHENG Binbin, LI Guibing

School of Management Science and Engineering,Shandong Technology and Business University,Yantai Shandong 264005,China

Received:2018-03-20 Revised:2018-04-26 Online:2018-07-28 Published:2020-11-25

摘要/Abstract

摘要： 为进一步明确碳纤维增强材料(CFRP)加固钢筋混凝土(RC)受弯构件的破坏模式,判断相关规范提出的CFRP许用剥离应变计算公式的正确性,设计并开展钢筋混凝土梁外贴CFRP加固试验,采用2点对称简支加载,探究加固试件的破坏模式和CFRP初始剥离时的应变。结果表明:加固试件的基本破坏模式为CFRP剥离破坏;一些规范规定的许用剥离应变与试验值的比值在0.28～5.12之间,多数规范的许用剥离应变远大于实测值,按规范计算的许用剥离应变的变异系数均大于46%;CFRP的剥离不仅与混凝土强度、CFRP用量和弹性模量有关,还与剪跨比、箍筋配筋率和纵筋配筋率等因素有关。

关键词: 钢筋混凝土(RC), 碳纤维增强材料(CFRP), 外贴, 剥离破坏, 许用剥离应变

Abstract: In order to further clarify the failure modes of RC flexural members strengthened with CFRP,and determine the accuracy of the formula for determining CFRP allowable debonding strain proposed by relevant codes,experimental tests were carried out to investigate the failure mode and tensile strain in CFRP laminates at initial debonding of CFRP-strenghtened RC beams which were simply supported and loaded under two points symmetrical loading.The results show that the main failure mode of the strenghtened beams is CFRP laminates debodning; the allowable debonding strains are 0.28-5.12 times of the tested tensile strains at initial debonding with a coefficient of variation more than 46%,and most of the code models highly overestimate the allowable debonding strain; the debonding of CFRP laminates of flexural strenghtened RC beam is related not only to the concrete strength,the amount of FRP laminates,and the modulus of elasticity,but also to the factors such as shear-span ratio,stirrup reinforcement ratio and longitudinal reinforcement ratio.

Key words: reinforced concrete (RC), carbon fiber reinforced polymer (CFRP), externally bonding, debonding failure, allowable debonding strain

中图分类号:

X948

徐俊艳, 郑彬彬, 李贵炳. 外贴CFRP增强钢筋混凝土梁许用剥离应变研究[J]. 中国安全科学学报, 2018, 28(7): 70-75.

XU Junyan, ZHENG Binbin, LI Guibing. Allowable debonding strain limitation ofexternally CFRP-strenghtened RC beam[J]. China Safety Science Journal, 2018, 28(7): 70-75.

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外贴CFRP增强钢筋混凝土梁许用剥离应变研究

Allowable debonding strain limitation ofexternally CFRP-strenghtened RC beam

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