Study on the Flexural Capacity of RC Beams Strengthened with FRP Grids Based on the Bond-Slip Cohesive Model

HU Wenhao; GUO Rui; REN Yu

doi:10.13204/j.gyjzG21062512

Volume 52 Issue 3

Jul. 2022

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HU Wenhao, GUO Rui, REN Yu. Study on the Flexural Capacity of RC Beams Strengthened with FRP Grids Based on the Bond-Slip Cohesive Model[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 216-226. doi: 10.13204/j.gyjzG21062512

Citation:

HU Wenhao, GUO Rui, REN Yu. Study on the Flexural Capacity of RC Beams Strengthened with FRP Grids Based on the Bond-Slip Cohesive Model[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 216-226. doi: 10.13204/j.gyjzG21062512

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Study on the Flexural Capacity of RC Beams Strengthened with FRP Grids Based on the Bond-Slip Cohesive Model

doi: 10.13204/j.gyjzG21062512

HU Wenhao^1,2,
GUO Rui^{2
,
,},
REN Yu²

1. Power China Chengdu Engineering Corporation Limited, Chengdu 610072, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received Date: 2021-06-25

Abstract

Abstract

In order to study the flexural behavior of concrete beams strengthened by fiber reinforced polymer (FRP) grid and cement substrate, 5 tested specimens were estabilshed finite element model with bond-slip cohesive element. The damage evolution mechanism in the interface between the FRP mesh-cement substrate layer and the RC beam during bending failure was analyzed. Parametric finite element models were established guided by the grid unit reinforcement and the beam reinforcement ratio. An improved calculation model for flexural bearing capacity about FRP grid reinforced RC beams based on the bond-slip cohesive model was proposed, and the correctness and applicability of the calculation model were verified by some references. The research indicated that finite element model established by the bond-slip cohesive model could effectively fit the test process and results. The interface damage between the composite layer and the RC beam appearred from the shear span and developed along the direction of the grid. The unit reinforcement amount and reinforcement ratio had great influence on the bending capacity of RC beam. The improved calculation model was correct and applicable, and could better predict the flexural bearing capacity of reinforced specimens and the meshed-span strain.
- FRP grid,
- reinforced concrete beam,
- finite element analysis,
- bond-slip,
- flexural capacity

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References(18)

References

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