Modeling of bonding between steel rebar and concrete at elevated temperatures

Pothisiri, Thanyawat; Panedpojaman, Pattamad

doi:10.1016/j.conbuildmat.2011.08.014

Cited by 52 publications

(18 citation statements)

References 18 publications

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“…This is because that the strain compatibility at the interface between steel bar and surrounding concrete is not always maintained when the pull-out load is applied [21], especially when the pull-out load reaches to the capacity of the bond. Also the reduction in the steel bar's diameter due to the Poisson effect during the pull-out load could compensate the influence of the differential thermal expansion between the steel bar and concrete.…”

Section: Incorporated Bond Stress-slip Model Into Vulcan Softwarementioning

confidence: 98%

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Analysis of bond-slip between concrete and steel bar in fire

Khalaf

Huang

Fan

2016

Computers & Structures

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This paper presents a robust model for predicting the bond-slip between the concrete and steel reinforced bar at elevated temperatures. The model is established based on a partly cracked thick-wall cylinder theory and the smeared cracking approach is adopted to consider the softening behaviour of concrete in tension. The model is able to consider a number of parameters: such as different concrete properties and covers; different steel bar diameters and geometries. The proposed model has been incorporated into the Vulcan program for 3D analysis of reinforced concrete structures in fire. The model has been validated against previous test results. KEYWORDS:Bond-slip, concrete structures, fire, splitting failure. RESEARCH HIGHLIGHTS: Develop a robust model for predicting the bond-slip between the concrete and steel reinforced bar at elevated temperatures.

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Section: Incorporated Bond Stress-slip Model Into Vulcan Softwarementioning

confidence: 98%

“…However, in the following validation section it is assumed that the temperatures of the concrete rings around the bars are uniform and equal to the temperature of steel bar for simplicity. This is a reasonable assumption for all pull-out tests [21].…”

Section: Incorporated Bond Stress-slip Model Into Vulcan Softwarementioning

confidence: 99%

Analysis of bond-slip between concrete and steel bar in fire

Khalaf

Huang

Fan

2016

Computers & Structures

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“…It can enhance the resistance of RC beams subjected to fire besides increasing the flexural and shear capacities of the RC beams [8]. There are theoretical and experimental studied in for using discrete steel fibers more than using discrete steel fibers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of discrete glass fibers on the behavior of R.C. Beams exposed to fire

et al. 2017

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The main objective of this paper is to investigate the effect of adding discrete glass fibers on the behavior of reinforced concrete (RC) beams under different fire and cooling conditions. Eighteen beams with different concrete compressive strengths were tested to study the behavior of reinforced concrete (RC) beams containing discrete glass fibers when exposed to different fire and cooling conditions. Nine beams were prepared from normal strength concrete (NSC) with compressive strength equal to 35 MPa while the other beams were prepared from high strength concrete (HSC) with compressive strength equal to 60 MPa. The beams contained different contents of discrete glass fibers. The modes of failure of tested specimens show that the crack patterns change according to fire condition and fiber content. Analysis of test results show that adding discrete glass fibers to NSC increased the residual stiffness of the tested specimens after firing and decreased the rate of the deflection gain during firing. Also adding fibers to concrete has a limited positive effect on the ultimate strength of the specimens compared to the control specimens. Its effect on deflection due to fire is more pronounced. Finally, the recommended optimum ratio of discrete glass fibers is not more than 0.5% of the total concrete weight.ª 2014 Production and hosting by Elsevier B.V. on behalf

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“…However, although the strength capacity of steel can become recovered, the same is not true for concrete. e interfacial bond strength between steel and confined concrete under elevated temperatures reduces even faster than steel according to experimental and numerical studies [8][9][10], whereas satisfactory accuracy may be achieved using perfect bond assumption for the prediction of global responses of RC structures in an environment of fire or elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Reinforced Concrete Beams Exposed to Fire by Using a Spectral Approach

Sun

Xie

Perera

et al. 2018

Advances in Materials Science and Engineering

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is paper presents a numerical procedure for predicting the mechanical behavior of reinforced concrete (RC) beams exposed to fire. ermal behavior is captured using a two-dimensional finite element (FE) model in an environment of elevated temperatures, while a one-dimensional spectral numerical model is formulated to simulate the mechanical response of the beam under increasing loads. Both models are integrated. Previous thermal results obtained from the FE model are provided for the proposed numerical model to calculate the responses of the RC beam for different levels of fire exposure. Few elements are deployed in this study due to the simplicity and efficiency of the proposed numerical model. Consequently, the computational burden of the numerical simulation for predicting the structural performances of RC beams exposed to fire is released comparing with conventional FE model. e numerical results are consistent with the test data, which demonstrate the model's capability of efficiently simulating the thermomechanical behaviors of RC beams due to its simplicity and accuracy.

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Modeling of bonding between steel rebar and concrete at elevated temperatures

Cited by 52 publications

References 18 publications

Analysis of bond-slip between concrete and steel bar in fire

Analysis of bond-slip between concrete and steel bar in fire

Effect of discrete glass fibers on the behavior of R.C. Beams exposed to fire

Modeling of Reinforced Concrete Beams Exposed to Fire by Using a Spectral Approach

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