Bond Behavior of Embedded Reinforcing Steel Bars for Varying Levels of Transversal Pressure

Afefy, Hamdy M.; El-Tony, El-Tony M.

doi:10.1061/(asce)cf.1943-5509.0000768

Cited by 16 publications

(3 citation statements)

References 7 publications

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“…As observed during the test, the corrugations in the sleeve significantly improve the bond performance between grout and bars due to the confinement stress imposed on the grout caused by the “wedge” action. Other studies have also demonstrated that the confinement from the sleeve plays a crucial role in heightening the bond strength of the grout/bar interface (Harajli, 2009; Bournas and Triantafillou, 2011; Afefy and EI-Tony, 2016). The actual mechanical behavior at the interface is commonly complex.…”

Section: Analysis Of Test Resultsmentioning

confidence: 97%

Behavior of a novel corrugated grouted sleeve splice for prefabricated construction under uniaxial tensile loading

Wei

Jinru

et al. 2023

Advances in Structural Engineering

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A corrugated grouted sleeve (CGS) made of a seamless tube, which is easy to produce at low cost, is presented. To investigate the connection behavior of CGS splices, a total of 33 specimens are manufactured and tested under monotonic loads. The effects of the corrugation number, groove depth, and steel bar diameter on the connection performance of the CGS are examined. The test results show that the proposed CGS is deemed an effective and reliable steel bar connector for precast structure buildings due to the groove in the corrugation, which plays a key role as a wedge to prevent bond failure of the steel bar splice and enhance the confinement action of the sleeve; one corrugation formed by the roll extrusion method at the end of the seamless tube is sufficient to provide a wedge action to ensure steel bar failure first; the depth of the groove is suggested to be more than 2 mm to ensure that the bond strength is sufficient before steel bar fracture. Finally, an analytical model is proposed to predict the tensile resistance of the CGS considering the influence of confinement caused by the corrugations, and the predictions are in good agreement with the experimental data.

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Section: Analysis Of Test Resultsmentioning

confidence: 97%

Behavior of a novel corrugated grouted sleeve splice for prefabricated construction under uniaxial tensile loading

Wei

Jinru

et al. 2023

Advances in Structural Engineering

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“…Afefy and El-Tony [44] assessed the effect of external pressure on bond-slip behaviour and required development length by performing pull-out tests on smooth and deformed rebars with short anchorage lengths. The experimental results showed that the percentage of bond strength increment in smooth rebar was more than that for a deformed bar.…”

Section: Transverse Pressurementioning

confidence: 99%

Numerical Study on Bar Slip Effects in Reinforced Concrete Bridge Bents Under Cyclic Loading

Rezaei Balouchi

2024

Preprint

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Assessing the bridge behaviour against cyclic loading after some powerful earthquakes, i.e., 1995 in Kobe, 2010 in Maule, showed thatbridge structures shouldbe designed andconstructed withgood detailing. Technical investigations showed that old bridge bents, i.e., that were designed prior 1980s in North America, are not equipped with appropriate detailing, especially in the beam-column joint. The most important factor in maintaining the composite application of reinforced concrete elements is the bond between rebars and surrounding concrete. Rebar slips and bond deterioration in cap beam-column joints in bridge bents, play a significant role on the cyclic behaviour under seismic loads. Previous studies on bridge bents indicated that in old bridge bents, damages initiate in the joint area, as a result of insufficient anchorage length of column longitudinal bars and lack of transverse reinforcement around them. Many researchers proposed different retrofitting schemes, such as applying transverse pressure on the joint area. However, to rehabilitate structures, first their as-built behaviour must be assessed. The common approach in assessing responses of older structures (used in present study) is collecting design details of structures, then develop a numerical model to simulate the experimental models, and real scale structures. The purpose of this research study is to propose a method in macro modelling to simulate the cyclic behaviour of older bridge bents with joint detailing deficiencies. Moreover, the effect of joint rehabilitation by applying external pressure on joints is investigated. In this case a fibre element, named slip simulator element, is developed in Opensees software. This model will be calibrated with experimental results on ordinary 2-span highway bridge bents which carried out by other researchers. To achieve an accurate macro modelling in Opensees, the input specifications of the macro model is attained from a micro model developed in ABAQUS. Comparing analytical results of macro modelling with experimental evidence shows that generally the proposed analytical approach is effective in predicting the cyclic response of both existing and rehabilitated bridge bents. Moreover, the proposed micro numerical modelling to determine inputs for the macro model is a reliable approach and has a good agreement with experimental results.

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“…Te sliding part of the rockbolt gradually advances towards the free end, inducing the rib of the rockbolt to crush the cement mortar, which accumulates in the grouted hole. Tis causes a wedge action and internal radial pressure on the concrete, resulting in radial expansion of the concrete, as shown in Figure 6 [26]. When the radial pressure exceeds the tensile strength of the concrete, internal cracks rapidly develop and spread to the surface of the concrete.…”

Section: Failure Mode Analysis Of the Grouted Rockbolt Systemsmentioning

confidence: 99%

Study on the Load Transfer Behaviour and Bond-Slip Model of Fully Grouted Rockbolt

Yu,

Yang,

Chen

et al. 2023

Shock and Vibration

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Rockbolts are often subjected to loads during service, and the load transfer behaviour of rockbolts is very important. Therefore, in this study, pullout tests were performed on two kinds of rockbolt systems, with and without defects, and the load transfer behaviour and failure modes were analysed. According to the load transfer process between the rockbolt and cement mortar interface, a bond-slip model considering the yield of the rockbolt was proposed, and the nonlinear behaviour in the softening stage was considered. The test results showed that the evolution of the interface load between the rockbolt and cement mortar in the grouted rockbolt systems without defects underwent four stages of gradual failure, namely, elasticity, yield, softening, and complete slip, and its failure mode involved the rockbolt being pulled out accompanied by splitting cracks and tensile cracks on the concrete surface. The proposed bond-slip models considering the nonyielding and yielding of the rockbolt can accurately reflect the actual load transfer behaviour of a fully grouted rockbolt.

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Bond Behavior of Embedded Reinforcing Steel Bars for Varying Levels of Transversal Pressure

Cited by 16 publications

References 7 publications

Behavior of a novel corrugated grouted sleeve splice for prefabricated construction under uniaxial tensile loading

Behavior of a novel corrugated grouted sleeve splice for prefabricated construction under uniaxial tensile loading

Numerical Study on Bar Slip Effects in Reinforced Concrete Bridge Bents Under Cyclic Loading

Study on the Load Transfer Behaviour and Bond-Slip Model of Fully Grouted Rockbolt

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