Local Bond Stress-Slip Behavior of Reinforcing Bars Embedded in Plain and Fiber Concrete

10.14359/999 ◽  
1995 ◽  
Vol 92 (4) ◽  
Keyword(s):  
Bond Stress ◽  
Reinforcing Bars ◽  
Fiber Concrete

Experimental Study on Bond Behavior of GFRP-to-Cement Mortar

2011 ◽  
Vol 94-96 ◽  
pp. 543-546
Author(s):  
Ning Zhang ◽  
Ai Zhong Lu ◽  
Yun Qian Xu ◽  
Pan Cui
Keyword(s):  
Aluminium Alloy ◽  
Cement Mortar ◽  
Bond Stress ◽  
Reinforcing Bars ◽  
Bond Performance ◽  
Gfrp Bars ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Average Bond

Direct pull-out tests were performed to evaluate the bond performance of glass fiber-reinforced polymer (GFRP) reinforcing bars in cement mortar. Specimens with different bar diameters and different grouted lengths (i.e., 5d, 10d and 15d, d is the diameter of bars) are prepared for the pull-out tests. For comparison, specimens with plain aluminium alloy bars (AAB) were tested as well. The result shows that the average bond stress between plain aluminium alloy bars and cement is much smaller than that between the deformed GFRP bars and cement; thin GFRP bars tended to have larger average bond stress; the shorter the grouted length, the smaller the maximum average bond stress. Only part of grouted length undertakes the bond stress and the length depends on the shear modulus of GFRP and the surrounding material.

Evaluation on the Bond Stress-slip Relationship of GFRP Reinforcing Bars with Spiral Ribs

2018 ◽  
Vol 30 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Hye-Jin Lee ◽  
Keun-Hyeok Yang ◽  
Si-Jun Kim ◽  
Sang-Hun Park
Keyword(s):  
Bond Stress ◽  
Reinforcing Bars ◽  
Relationship Of

scholarly journals Experimental Study on Bond Behavior between Plain Reinforcing Bars and Concrete

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Guohua Xing ◽  
Cheng Zhou ◽  
Tao Wu ◽  
Boquan Liu
Keyword(s):  
Aluminium Alloy ◽  
Structural Characteristics ◽  
Bond Stress ◽  
Reinforcing Bars ◽  
Bond Slip ◽  
Bond Behavior ◽  
Reinforcing Bar ◽  
Test Parameters ◽  
Steel Bars ◽  
Plain Bars

To evaluate the bond behavior between the reinforcing bar and surrounding concrete, a total of six-group pullout specimens with plain steel bars and two-group specimens with deformed steel bars, serving as a reference, are experimentally investigated and presented in this study. The main test parameters of this investigation include embedment length, surface type of reinforcing bars, and bar diameter. In particular, the bond mechanism of plain steel reinforcing bars against the surrounding concrete was analyzed by comparing with six-group pullout specimens with aluminium alloy bars. The results indicated that the bond stress experienced by plain bars is quite lower than that of the deformed bars given equal structural characteristics and details. Averagely, plain bars appeared to develop only 18.3% of the bond stress of deformed bars. Differing from the bond strength of plain steel bars, which is based primarily on chemical adhesion and friction force, the bond stress of aluminium alloy bars is mainly experienced by chemical adhesion and about 0.21~0.56 MPa, which is just one-tenth of that of plain steel bars. Based on the test results, a bond-slip model at the interface between concrete and plain bars is put forward.

Effect of Lightweight Concrete Density on Bond Strength

2015 ◽  
Vol 1106 ◽  
pp. 33-36
Author(s):  
Jaroslav Kadlec ◽  
Ivailo Terzijski ◽  
František Girgle ◽  
Lukáš Zvolánek
Keyword(s):  
Bond Strength ◽  
Lightweight Concrete ◽  
Bond Stress ◽  
Normal Density ◽  
Carbon Fibres ◽  
Reinforcing Bars ◽  
Anchorage Length ◽  
Hybrid Reinforcement

The main objective of this paper is connected with the search of an optimal anchorage length of reinforcement in lightweight and ultra-lightweight concretes. Experimentally obtained values of the bond stress between lightweight concrete and reinforcing bars are presented. The density classes of lightweight concrete were D1,0, D1,2 and D1,4. The results are compared with equal ones of normal density concrete. The tests with ordinary reinforcement and with non-metallic hybrid reinforcement C-GFPR (30% portion of carbon fibres) were conducted.

Stress along tensile lap-spliced fibre reinforced polymer reinforcing bars in concrete

2007 ◽  
Vol 34 (9) ◽  
pp. 1149-1158 ◽  
Author(s):  
Ragi Aly
Keyword(s):  
Mathematical Model ◽  
Large Scale ◽  
Bond Stress ◽  
Experimental Results ◽  
Reinforcing Bars ◽  
Reinforced Polymer ◽  
Pullout Tests ◽  
Fibre Reinforced Polymer ◽  
Displacement Theory ◽  
Frp Bars

A theoretical study was carried out to investigate stress along tensile lap-spliced spaced or bundled fibre reinforced polymer (FRP) bars in concrete. R. Tepfers developed a mathematical model, which could be applied for any type of reinforcing bar, based on the modulus of displacement theory. The mathematical model can predict the bond stress and stresses in the reinforcing bars and the surrounding concrete. In this paper, the model developed by Tepfers was represented by applying the modulus of displacement theory, and theoretical predictions are compared with the experimental results from testing 16 large-scale concrete beams. Good agreement between the theoretical values and experimental results was observed at three stages of loading. Recommendations for investigating the modulus of displacement from pullout tests have been included. Lastly, the maximum average bond stress of spliced FRP bars can be estimated using the ultimate failure pattern analysis, in which the contributions of the splitting resistance were included.Key words: beams, fibre reinforced polymer (FRP) bars, bundled bars, concrete, tensile lap-splice, pullout tests, modulus of displacement, flexural tests.

Bond between epoxy-coated reinforcing bars and concrete under impact loading

1994 ◽  
Vol 21 (1) ◽  
pp. 89-100 ◽  
Author(s):  
Cheng Yan ◽  
Sidney Mindess
Keyword(s):  
Reinforced Concrete ◽  
Strain Rate ◽  
Fracture Energy ◽  
Impact Loading ◽  
Steel Fibre ◽  
Bond Stress ◽  
Fibre Reinforced Concrete ◽  
Reinforcing Bars ◽  
Polypropylene Fibres ◽  
Steel Fibres

The bond between epoxy-coated reinforcing bars and concrete under static, high strain rate, and impact loading was studied for plain concrete, polypropylene fibre reinforced concrete, and steel fibre reinforced concrete. The bond stress, slip, crack development, the bond stress–slip relationship, and the fracture energy during the bond-slip process were investigated experimentally. The results were compared with those for uncoated reinforcing bars. It was found that for epoxy-coated rebars, the bond resistance decreased, in terms of the maximum local bond stress and the average bond stress; wider cracks developed during the bond process; and the fracture energy during bond failure decreased. It was also found that the influence of epoxy coating on the bond behaviour for push-in loading was much more significant than for pull-out loading. However, steel fibre additions at a sufficient content, and higher concrete strength, can mitigate the above effects to a considerable degree. Polypropylene fibres were much less effective in this regard than steel fibres. Key words: epoxy-coated rebars, bond, fibre concrete, strain rate, impact steel fibres, polypropylene fibres, concrete, high strength concrete.

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