Abstract
A dual-horizon peridynamics (DH-PD) model is proposed for the simulation of debonding process in fiber-reinforced polymer (FRP)-to-concrete bonded joints. In the novel procedure of implementing DH-PD in the framework of finite element method (FEM), truss elements are employed to represent the bonds and dual-bonds. The quadtree approach is utilized to generate the multi-scale discretization and a volume correction scheme based on the background grid is proposed for the non-uniform grid. A benchmark numerical example is performed to test the accuracy and efficiency of the developed model in analysis of the bond behavior. The predicted results are consistent with the experimental findings, the FEM results and the analytical solutions. Additionally, these results demonstrate that the bond strength and the debonding ductility are visibly affected by concrete strength and the thickness of FRP plate, while the adhesive thickness has no significant impact on the debonding behavior.
Highlights
Fiber-reinforced polymer (FRP) is a kind of high performance material with high strength-to-weight ratio, good durability and ease of application
5.1 Effect of Concrete Strength In order to investigate the effect of concrete strength on the bond behavior, four groups of dual-horizon peridynamics (DH-PD) models for specimen II-5 with concrete strengths ranging from C20 to C50 were adopted
6 Conclusions A DH-PD model implemented in the framework of finite element method (FEM) with multi-scale discretization and a volume correction scheme have been developed for the simulation of debonding process in FRP-to-concrete bonded joints in this paper
Summary
Fiber-reinforced polymer (FRP) is a kind of high performance material with high strength-to-weight ratio, good durability and ease of application. The other is the direct modeling approach, in which debonding is simulated by modeling the failure of concrete adjacent to the adhesive layer (Lu et al 2005a, 2006; Pham and AlMahaidi 2007; Tao and Chen 2015; Xu et al 2015) The success of the former approach depends on the constitutive law of the interface elements; as a result, it is not truly predictive. Heterogeneous materials and structures, such as FRP strengthened concrete structures necessitate the non-uniform and multi-scale discretization to model different constitutive materials separately and reduce the computational cost. 4, a DH-PD model of FRP-to-concrete bonded joints is established and a comparison between DH-PD predictions with test results is carried out to validate the proposed method on debonding failure.
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