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外贴CFRP板加固混凝土梁桥界面特性研究的宽缺口梁法

, PP. 71-79

Keywords: 桥梁工程,混凝土梁桥,宽缺口梁法,界面特性,CFRP板

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Abstract:

?为了更精确地研究CFRP板-混凝土界面特性,基于混凝土梁受弯时不考虑混凝土抗拉强度的基本假定,将四点弯混凝土梁的纯弯段混凝土保护层部分切除形成宽缺口梁;共浇筑11根钢筋混凝土梁,研究并对比了未加固混凝土梁、加固后的普通混凝土梁和加固后的宽缺口混凝土梁的力学特性及CFRP板-混凝土界面的粘结滑移特性。结果表明:CFRP板对普通混凝土梁的加固效果优于宽缺口混凝土梁;用宽缺口梁来研究CFRP板-混凝土界面的粘结滑移特性具有一定优势,CFRP材料的受力明确,应变和界面滑移测试方便;回归得到的CFRP板-混凝土界面的平均剪应力与界面剥离承载力的表达式精确简洁,具有推广意义。

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