Crack Analysis Method of Prestressed Concrete Beams Strengthened with
CFRP Based on Cohesive Theory

doi:10.3969/j.issn.1674-0696.2020.04.08

Abstract

Abstract: In order to calculate the crack characteristics of prestressed concrete beams strengthened with CFRP sheets accurately,the theoretical analysis model of cohesion was established by adopting the cohesion theory and incremental analysis,and introducing the interface bonding slip constitutive relation. The crack characteristics of the strengthened beams were theoretically deduced, which was based on the overall strength of the interface bonding material. And the theoretical calculation formulas of the crack width and spacing of the strengthened beams were put forward.Compared with the actual reinforcement test, it is found that: the error of the calculation value of crack spacing and crack width based on the cohesion theory is 5.77% and 12.83% respectively; the calculation results are in good agreement with the actual results, which can be applied to the crack calculation of the actual strengthened structure.

Key words: bridge engineering, CFRP, cohesive theory, prestressed concrete, crack

摘要： 为了准确计算碳纤维布加固预应力混凝土梁的裂缝特性，采用内聚力理论，通过增量分析，引入界面粘结滑移本构关系，建立了内聚力理论分析模型，并利用界面粘合材料的整体强度对被加固梁的裂缝特性进行了理论推导，提出了被加固梁裂缝宽度和间距的理论计算公式。与实际的加固试验进行对比，结果表明：基于内聚力模型所得裂缝间距计算值的误差为5.77%，裂缝宽度计算结果的误差为12.83%；计算结果与实际结果较为吻合，可应用于实际被加固结构的裂缝计算。

关键词: 桥梁工程, CFRP, 粘结理论, 预应力混凝土, 裂缝

CLC Number:

U445.72

REN Wei 1，ZHAO Man2，LIU He2. Crack Analysis Method of Prestressed Concrete Beams Strengthened with CFRP Based on Cohesive Theory[J]. Journal of Chongqing Jiaotong University(Natural Science), 2020, 39(04): 41-45.

任伟1，赵满2，刘贺2. 基于内聚力理论的CFRP加固预应力混凝土梁裂缝分析方法[J]. 重庆交通大学学报（自然科学版）, 2020, 39(04): 41-45.

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Crack Analysis Method of Prestressed Concrete Beams Strengthened with CFRP Based on Cohesive Theory

基于内聚力理论的CFRP加固预应力混凝土梁裂缝分析方法

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