快速荷载下CFRP-高温后混凝土界面正拉粘结性能试验

罗威; 肖云逸; 何栋尔; 章子华

doi:10.6052/j.issn.1000-4750.2017.06.S059

快速荷载下CFRP-高温后混凝土界面正拉粘结性能试验

宁波大学建筑工程与环境学院, 宁波 315211

基金项目: 国家自然科学基金项目（51308307）；浙江省自然科学基金项目（LY18E080013）；宁波市自然科学基金项目（2016A610089）

详细信息

作者简介:
罗威(1992-),男,浙江人,硕士生,从事FRP加固混凝土结构研究(E-mail:2436293197@qq.com);肖云逸(1994-),男,浙江人,硕士生,从事FRP加固混凝土结构研究(E-mail:295369025@qq.com);何栋尔(1995-),男,浙江人,硕士生,从事FRP加固混凝土结构研究(E-mail:1515796846@qq.com)

通讯作者:
章子华(1984-),男,浙江人,副教授,博士,硕导,从事FRP加固混凝土结构研究(E-mail:zhangzihua@nbu.edu.cn).

中图分类号: TB332
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出版历程
- 收稿日期: 2017-06-02
- 修回日期: 2017-12-06
- 刊出日期: 2018-06-29

Experimental study on interfacial tensile bonding performance of pre-heated CFRP-concrete under fast load

School of Architecture, Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China

摘要

摘要: 该文通过对90个CFRP-高温后混凝土标准试件进行快速荷载下正拉试验，得到了加载速率、混凝土强度等级及过火温度等因素对界面正拉粘结强度的影响规律。在欧洲规范（CEB-FIP1990）建议的混凝土动态抗拉强度公式和高温后混凝土轴心抗拉强度折减公式基础上，综合考虑应变率效应和高温劣化作用，提出了高温后界面正拉粘结强度预测模型，并验证其可靠性。在此基础上给出了不同混凝土强度等级构件火灾后极限加固修复温度。试验结果表明：正拉粘结强度随混凝土强度等级和加载速率的提高而提高；在20℃~500℃内提高过火温度会显著降低界面正拉粘结强度，超过500℃后下降幅度不明显。
- 快速荷载下 /
- CFRP /
- 火灾后加固 /
- 界面破坏 /
- 正拉粘结强度 /
- 应变率效应
Abstract: Tensile tests of 90 pre-heated CFRP - concrete specimens were conducted under fast load. The influences of three critical parameters on tensile bonding strength were investigated, including loading rate, concrete strength and heating temperature. According to the formula for dynamic tensile strength of concrete suggested by European code CEB-FIP1990 and the formula for the reduced axial tensile strength of concrete after elevated temperature, a model for estimating the interfacial tension bonding strength after elevated temperature was developed and verified. The limit temperature for repair and rehabilitation of concrete component after fire was suggested in terms of different strength grades to concrete. Results show that the tensile bonding strength increases with the increase of loading rate and concrete strength. In the range of 20℃ to 500℃, the interfacial tensile bonding strength significantly decreases with the increasing heating temperature, but no remarkable decrease is observed over 500℃.
- fast load /
- CFRP /
- reinforcement after fire /
- interfacial failure /
- tensile bonding strength /
- strain rate effect

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参考文献(19)

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4.	王正振，龚维明，戴国亮，刘凌锋. FRP管混凝土桩与钢管混凝土桩黏结性能对比分析. 东南大学学报(自然科学版). 2019(05): 933-939 . 百度学术

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文章访问数: 406
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快速荷载下CFRP-高温后混凝土界面正拉粘结性能试验

通讯作者: 章子华(1984-),男,浙江人,副教授,博士,硕导,从事FRP加固混凝土结构研究(E-mail:zhangzihua@nbu.edu.cn).

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出版历程

Experimental study on interfacial tensile bonding performance of pre-heated CFRP-concrete under fast load

期刊类型引用(4)

其他类型引用(4)

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出版历程

目录

通讯作者:
章子华(1984-),男,浙江人,副教授,博士,硕导,从事FRP加固混凝土结构研究(E-mail:zhangzihua@nbu.edu.cn).