CFRP加固组合梁承载力性能实验研究

玻璃钢/复合材料 ›› 2019, Vol. 0 ›› Issue (2): 13-19.

CFRP加固组合梁承载力性能实验研究

陆依晖^1,2,3, 杨健^1,2,3*, 王斐亮^1,2,3, 刘清风^1,2,3

1.上海交通大学海洋工程国家重点实验室,上海200240;
2.绿色建筑材料国家重点实验室,上海200240;
3.高新船舶与深海开发装备协同创新中心,上海200240

收稿日期:2018-06-12 出版日期:2019-02-28 发布日期:2019-02-28
通讯作者: 杨健(1974-),男,博士,教授,博士生导师,主要从事新型建材与结构研究方面的工作,j.yang.1@sjtu.edu.cn。
作者简介:陆依晖(1994-),女,硕士研究生,主要从事混凝土结构研究方面的工作。
基金资助:
国家重点专项(2016YFC0701400);国家自然科学基金项目(51378308)

EXPERIMENTAL INVESTIGATION ON THE COMPOSITE BEAMS STRENGTHENED WITH CFRP SHEETS

LU Yi-hui^1,2,3, YANG Jian^1,2,3*, WANG Fei-liang^1,2,3, LIU Qing-feng^1,2,3

1.State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2.State Key Laboratory of Green Building Materials, Shanghai 200240, China;
3.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China

Received:2018-06-12 Online:2019-02-28 Published:2019-02-28

摘要/Abstract

摘要： 对碳纤维复合增强材料(CFRP)条带加固的混凝土-钢组合梁抗弯性能进行实验研究。在考虑CFRP条带加固长度和宽度两个变量的基础上,采用四点加载的方式,研究加固和未加固组合梁在加载过程中的承载力性能。通过分析试件的荷载-位移曲线和其破坏模态,揭示在加固前后混凝土试件的初裂荷载和极限承载力的变化规律,并分析组合梁各类破坏模态的产生机理。实验研究结果表明:采用CFRP条带加固的组合梁承载能力会提高,当CFRP加固长度为试件总长的60%时,承载力的提高效率最高。同时提出一桁架模型,用以分析加固前后组合梁中混凝土板、钢梁腹板以及FRP条带的内力,为该类加固梁的极限荷载预测提供了依据。

关键词: CFRP加固, 混凝土-钢组合梁, 四点弯曲实验, 破坏模态, 承载力, 桁架模型

Abstract: This paper presents the works of investigating the structural behaviors of composite beams before and after being strengthened with CFRP strips at the tension soffit. Seven samples were examined by the four-point bending loading tests. Among the seven samples, one was un-strengthened and the remaining six were strengthened by bonding CFRP strips of different numbers, width and length, respectively. All samples were tested beyond their ultimate failure. By recording the load-deflection data for the entire history, the first crack load, the CFRP debonding load or concrete longitudinal failure loads were identified. Meanwhile, the typical failure modes are documented and their respective mechanisms are analyzed. Comparing the strengthened beams with the reference one, the ultimate strength of composite beams strengthened by CFRP strips is significantly increased, and the most effective one is the beam strengthened by the CFRP strip of 60% beam length. In addition, a truss model is proposed to calculate the internal forces in the concrete, steel beam and FRP strips, from which the prediction for the failure load can be performed.

Key words: FRP composites, concrete-steel composite beam, four-points bending test, failure modes, loading capacity, truss model

中图分类号:

TB332

陆依晖, 杨健, 王斐亮, 刘清风. CFRP加固组合梁承载力性能实验研究[J]. 玻璃钢/复合材料, 2019, 0(2): 13-19.

LU Yi-hui, YANG Jian, WANG Fei-liang, LIU Qing-feng. EXPERIMENTAL INVESTIGATION ON THE COMPOSITE BEAMS STRENGTHENED WITH CFRP SHEETS[J]. Fiber Reinforced Plastics/Composites, 2019, 0(2): 13-19.

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