Numerical Study of Bond – Slip Mechanism in Advanced Externally Bonded Strengthening Composites

2018 ◽  
Vol 22 (11) ◽  
pp. 4509-4518 ◽  
Author(s):  
Hashem Jahangir ◽  
Mohammad Reza Esfahani
Keyword(s):  
Numerical Study ◽  
Bond Slip ◽  
Slip Mechanism ◽  
Externally Bonded

Experimental Study on Bond-Slip Constitutive Relation between CFL and Concrete

2013 ◽  
Vol 302 ◽  
pp. 359-364
Author(s):  
X.H. Zheng ◽  
P.Y. Huang ◽  
X.Y. Guo ◽  
Q. Han
Keyword(s):  
Constitutive Relation ◽  
Displacement Sensor ◽  
Key Factors ◽  
Bond Slip ◽  
Factors Affecting ◽  
Slip Mechanism ◽  
Double Shear ◽  
Carbon Fiber Laminate ◽  
Externally Bonded ◽  
Longitudinal Strains

Externally bonded reinforcing technique with fiber reinforced polymer (FRP) has been widely used in civil engineering. The performance of the interface between FRP and concrete is one of the key factors affecting the behavior of the strengthened structures. This paper presents a detailed study on the bond-slip mechanism between carbon fiber laminate (CFL) and concrete based on double-shear tests. 8 specimens with different bonded length and width of CFL were tested under static loading. Strain gauges along the CFL face and displacement sensor were used to measure longitudinal strains and slip of the interface. The bond-slip constitutive relation of the interface between CFL and concrete was analyzed with the testing results. Compared with four different bond-slip models, a shear stress-slip model was proposed based on the experimental data.

scholarly journals Modeling of CFRP strengthened RC beams using the SNSM technique, proposed as an alternative to NSM and EBR techniques

2020 ◽  
Vol 14 (54) ◽  
pp. 21-35
Author(s):  
Adel Boulebd ◽  
Ferhoune Noureddine ◽  
Boukhezar Mohcene ◽  
Habib Abdelhak Mesbah
Keyword(s):  
Finite Element ◽  
Failure Mode ◽  
Numerical Study ◽  
Concrete Cover ◽  
Rc Beams ◽  
Near Surface ◽  
Externally Bonded ◽  
Bending Capacity ◽  
Near Surface Mounted ◽  
Abaqus Software

In this paper, an analytical and numerical study in FEM finite element by the ABAQUS software was conducted. Which aims to study the behaviour of RC beams bending strengthened with SNSM side near surface mounted technique, proposed as a solution to avoid the failure mode by debonding of the strengthening, the disadvantage of the EBR externally bonded reinforced technique, and the failure mode by separation of the concrete cover relative to the NSM near surface mounted technique, by comparing the behaviour of the three techniques, the effect of the quantity of strengthening and confirm the results with the literature. The results of this study show that the numerical and analytical model can predict the behaviour of strengthened RC beams according to the three techniques, a clear improvement of the bending capacity of beams strengthened is noticed. A good preservation of the ductility of SNSM beams with a better failure mode.

scholarly journals Experimental Study on FRP-to-Concrete Bonded Joints with FRP Sheet Anchor System

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Weiwen Li ◽  
Wei Liu ◽  
Xu Yang ◽  
Feng Xing
Keyword(s):  
Design Guidelines ◽  
Reinforced Concrete Beams ◽  
Constitutive Relationship ◽  
Bond Slip ◽  
Anchor System ◽  
Concrete Members ◽  
Cfrp Sheet ◽  
Externally Bonded ◽  
Anchor Systems ◽  
Frp Sheet

Fiber-reinforced polymer (FRP) has been widely used for retrofitting and strengthening concrete structures over the past two decades. Because concrete members retrofitted by externally bonded FRP sheets can fail prematurely in debonding because of the fracture between FRP and concrete, FRP tensile strength cannot be fully utilized in engineering practices. Numerous useful investigations have been conducted to develop effective anchor systems to restrict FRP debonding. Thus, an FRP sheet-anchor system was developed and observed to be one of the most effective and convenient anchor systems. The FRP sheet-anchor system is applied to reinforced concrete beams strengthened with U-wrapping and side-bonded FRP configurations in few design guidelines. However, only a few investigations have focused on the failure mechanism of the FRP sheet-anchor system in the existing literature. Therefore, the main objective of this study is analyzing the effect of the carbon FRP (CFRP) sheet-anchor system on the bonding behavior of the CFRP-concrete interface, particularly the effect of the width and stiffness of the CFRP sheet-anchor system. In addition, the anchor-strengthened stage is defined by the load-slip response, which is different from that of specimens without the CFRP sheet-anchor system. Based on the experimental results, three linear stage models of the bond-slip constitutive relationship are proposed in this study.

Bond–Slip Mechanism of Rammed Earth–Timber Joints in Chinese Hakka Tulou Buildings

2021 ◽  
Vol 147 (5) ◽  
pp. 04021037 ◽  
Author(s):  
Yi Luo ◽  
Haopeng Zhong ◽  
Nan Ding ◽  
Pengpeng Ni ◽  
Yuye Xu ◽  
...  
Keyword(s):  
Rammed Earth ◽  
Bond Slip ◽  
Slip Mechanism ◽  
Timber Joints

Prediction Bond Strength between FRP and Concrete Interface by LEFM Method

2014 ◽  
Vol 988 ◽  
pp. 195-200 ◽  
Author(s):  
Gu Sheng Tong ◽  
Shen Shen Chen
Keyword(s):  
Model Comparison ◽  
Three Dimensional ◽  
Shear Stiffness ◽  
Bond Slip ◽  
Linear Elastic ◽  
Frp Composites ◽  
Element Simulation ◽  
Externally Bonded ◽  
Elastic Fracture ◽  
Concrete Interface

To evaluate the interface strength of externally bonded fiber-reinforced polymer (FRP) composites to concrete structures, the method of the Linear Elastic Fracture Mechanic (LEFM) model is simply used. The parameters defining the material properties, describing bond action of the FRP-concrete interface is used , which was got recently by Obaidat from three-dimensional (3D) finite-element simulation results. Both the fracture energy and shear strength of the interface are determined by a function of concrete compressive strength and the adhesive shear stiffness, the maximum transferable load is predicted by LEFM interface bond-slip model. Comparison between the predicted and the experiment results shows good agreement and a certain degree of safe estimation.

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