Abstract
Abstract The interfacial stress in a carbon fiber-reinforced polymer (CFRP) plate for strengthening the top flange of a box-girder bridge was theoretically investigated. According to the force analysis results of the box-girder structure, the most unfavorable force area was selected for modeling analysis. Using the simplified beam model, a CFRP plate-concrete interfacial-stress calculation model was derived, and the closed-form solution of the calculation model was obtained. Equivalent simplified test specimens were designed according to the box-girder structure to verify the reliability of the theoretical model. Then, four-point bending tests of the sample were performed. In these tests, the debonding failure modes and strain in the CFRP plate were examined. The CFRP plate-concrete interfacial stress was calculated according to the strain data of the CFRP plate in the experimental tests. Then compared the experimental results with the theoretical results. Furthermore, the corresponding interfacial stresses were calculated and compared according to the different load levels specified in the code. A series of theoretical and experimental comparisons were performed to verify the reliability of the proposed CFRP-concrete interfacial stress closed-form solution model.
Highlights
Carbon fiber-reinforced polymer (CFRP) is generally formed through a series of heat treatments, and carbon fiber tow and epoxy resin are typically used as basic materials
The top flange of a box-girder bridge was strengthened using a CFRP plate to investigate the facile occurrence of plate-end debonding failure
The peak of the interface normal stress in the CFRP plate–concrete interface appeared at the end position
Summary
Carbon fiber-reinforced polymer (CFRP) is generally formed through a series of heat treatments, and carbon fiber tow and epoxy resin are typically used as basic materials. Different types of cracks appear in concrete box-girder bridges when they are subjected to various loads and exposed to harsh environments In this regard, the use of the CFRP plate can improve the lateral rigidity of the girder. Sun et al (2017a, 2017b) simulated the entire debonding failure process of a CFRP plate on a concrete structure and proposed a bi-fold line interfacial bonding model based on finite-element analysis results. The top flange of a box-girder bridge was strengthened using a CFRP plate to investigate the facile occurrence of plate-end debonding failure. Using the force analysis results of the box girder, according to the debonding failure of the plate end of the CFRP–concrete interface, a closed-form theoretical calculation model for the interfacial stress was proposed. In the thickness direction of the adhesive layer, the longitudinal stress variation of the interfacial stress is considered
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