Relationship of Bond Stress, Steel Stress, and Slip in Reinforced Concrete

Kankam, Charles K.

doi:10.1061/(asce)0733-9445(1997)123:1(79)

Cited by 105 publications

(63 citation statements)

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“…The results obtained by means of the proposed model in the elastic domain are compared with those obtained on 25-mm cold-worked ribbed bars (E s = 200 GPa, concrete cube strength f cw = 50 MPa) by Kankam (1997). The distribution of the strains along one half of the tie is shown in figure 12.…”

Section: Elastic Behavior Of the Barmentioning

confidence: 99%

Analytical Modeling of the Pre- and Postyield Behavior of Bond in Reinforced Concrete

2007

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This paper presents the theoretical basis and the main results of an analytical model that describes the pre-and post-yield response of bond in reinforced concrete, as well as its influence on the behavior of structural members. The model is based on a number of reasonable assumptions that simplify the differential equation governing the phenomenon. In this way, a closed-form integration is feasible in certain cases, and relatively simple but accurate expressions can be worked out for the interface slip, the strain and the stress in the reinforcement and the bond stress at the bar-concrete interface. Applications are made to different structural members (pull-out specimens, tension ties and beams in bending), whose behavior is well documented in the literature. The agreement between the available test data turns out to be quite satisfactory. Consequently, the proposed model can be usefully adopted for studying the serviceability behavior, the ductility and the post-yield response of a variety of reinforced-concrete members.

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Section: Elastic Behavior Of the Barmentioning

confidence: 99%

Analytical Modeling of the Pre- and Postyield Behavior of Bond in Reinforced Concrete

2007

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“…The behaviour of a RC tie between two consecutive cracks has been experimentally investigated by Houde (1974) Scott andGill (1987) and Kankam (1997). Figure 2(a) shows the reinforcement strain distribution along a 200mm length bar at various load stages as reported by Kankam (1997).…”

Section: Behaviour Of a Reinforced Concrete Tiementioning

confidence: 99%

A new method for formulating crack spacing models of RC ties

Kaklauskas¹,

Ramanauskas²,

Jakubovskis³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Cracking of concrete is one of the most complicated phenomena in reinforced concrete analysis and is one of the key aspects governing serviceability analysis of RC structures. Current methods for investigating cracking rely on empirical approaches that give unreliable results with errors of multiple times the real value. A new non-empirical method based on the combination of the stress-transfer and the smeared approaches is proposed for deriving crack spacing models. The stress-transfer approach governs the strain distribution of the reinforcement between the consecutive cracks whereas the smeared approach allows for the estimation of the mean strain of the element. The suggested method introduces the concept of damage zones: the bond in the area adjacent to the normal cracks is considered to be fully damaged, thus bond behaviour is non-uniform in the segment between cracks. Crack spacing models were derived using the load-strain analysis method presented in the Eurocode 2 and were shown to give results that are in good agreement with the crack spacing values taken from available experimental data.

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“…According to An et al (1997), for a certain steel bar or FRP grid, the maximum effective tension area of the reinforced concrete (A ctmax ) or the overlay (A otmax ) within which a stable crack can develop is given by the following equation:…”

Section: Modified Tooth Model By Zhang Et Al (2012)mentioning

confidence: 99%

“…Figure 4a shows a longitudinal segment of the beam strengthened with steel plates or FRP laminates between adjacent cracks subjected to a uniaxial tensile force. The bond stresses at the reinforcement-concrete and the concrete-steel plate (FRP laminate) interfaces at the stabilized crack stage are assumed to follow a parabolic variation according to Kankam (1997) and Jiang et al (1984). Figure 4b illustrates a free body diagram of the composite elements with a length of dx.…”

Section: Steel Plate and Frp Laminate Strengtheningmentioning

confidence: 99%

A Design Proposal for Concrete Cover Separation in Beams Strengthened by Various Externally Bonded Tension Reinforcements

Zhang

Ueda

Furuuchi

2012

ACT

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Abstract:Previous research has shown that the application of externally bonded reinforcements (steel plates, fiber-reinforced polymer (FRP) laminates, overlays, etc.) to strengthen reinforced concrete (RC) beams can lead to brittle debonding failures before the ultimate load is reached. The aim of this study is to develop an analytical approach for the flexural strengthening of existing structures using various types of external reinforcements and predicting the debonding failure. In this study, an analytical model is developed to predict concrete cover separation failure in beams with overlay strengthening that is also applicable to strengthening using other reinforcements, such as steel plates and FRP laminates. An experimental database with various types of beam specimens is used to verify the model's validity and reliability. A concept for determining the effective strengthening capacity in a strengthening design is presented and the main parameters affecting the strengthening capacity are investigated. Finally, a design proposal is presented for the flexural strengthening of RC beams with respect to concrete cover separation failure. This proposal contributes to the application of external flexural strengthening in practical design.

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Relationship of Bond Stress, Steel Stress, and Slip in Reinforced Concrete

Cited by 105 publications

References 0 publications

Analytical Modeling of the Pre- and Postyield Behavior of Bond in Reinforced Concrete

Analytical Modeling of the Pre- and Postyield Behavior of Bond in Reinforced Concrete

A new method for formulating crack spacing models of RC ties

A Design Proposal for Concrete Cover Separation in Beams Strengthened by Various Externally Bonded Tension Reinforcements

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