Analysis on mechanical properties of FRP retrofitted concrete beam-column structure using cohesive model

被引：0
|
作者：
Chen Z. [1 ,2 ]
Wei C. [1 ]
Luo Q. [1 ]
Di J. [1 ,2 ]
机构：
[1] School of Civil Engineering, Chongqing University, Chongqing
[2] Key Laboratory of New Technology for Construction of Cities in Mountain Area, China Ministry of Education, Chongqing University, Chongqing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷 / 09期
关键词：
Beam-column structure; Bond-slip; Catenary action; Cohesive model; Compressive arch action; Debonding failure; FRP retrofit;
D O I：
10.14006/j.jzjgxb.2017.0505
中图分类号：
学科分类号：
摘要：
The mechanical properties of the bonding interface between the FRP sheet and the surface of concrete structures are important to the bearing capacity of the FRP-retrofitted concrete structures. By using the bilinear cohesive constitutive model, the cohesive element to simulate the nonlinear softening mechanism of the bonding interface is proposed. The loading process of the FRP-retrofitted beam-column structure were simulated by finite element method in which the cohesive elements for the bonding interface were combined with the separated nonlinear elements of concrete and steel bars. The stress of FRP sheet, shear stress and slipping of the bonding interface, failure mechanism and bearing capacity of the retrofitted beam-column structure were analyzed numerically. The simulated results were compared with the results by model tests and by other FEM in which the bond-slip of the interface was ignored. According to the numerical analysis results, the tensile stresses of FRP sheet, bonding stresses and the damage parameter in the interface are larger at the beam-column joint than those at the mid-span of the beam. The peeling of the FRP sheet from the concrete cover starts at the beam-column joint and was extended to the mid-span of the beam with the loading. After the cracking of the concrete cover, the loading is balanced by both of the FRP and steel bar in catenary way. This simulated mechanism and damage phenomena are in good accordance with those obtained by the model tests. The accuracy of the presented simulating method is proved by small relative errors (lower than 5%) of the ultimate bearing capacity of the retrofitted beam-column structure between the simulated results and the model tests. By comparison with the results of the presented adhesive finite element model, the finite element analysis model in which the softening and slipping of the bonding interface are ignored, would result in an over-estimated contribution of the FRP sheet to the catenary action and the ultimate bearing capacity of the retrofitted structure. It is shown that the proposed adhesive model for the boding interface is an effective and practicable method for the analysis of FRP retrofitted structures. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
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页码：122 / 130
页数：8
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