Empirical Study of Bar Development Behavior

Zsutty, Theodore C.

doi:10.1061/(asce)0733-9445(1985)111:1(205)

Cited by 20 publications

(5 citation statements)

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“…Researchers reported that the average bond strength is proportional to tensile strength of concrete and can be represented in power terms of concrete compressive strength (f'c) n . Power term (n) is defined by many researchers as 0.5 [3,4], 0.33 [5], 0.25 [6,7], 0.75 [8], 0.667 [9].…”

Section: Concrete Characteristicsmentioning

confidence: 99%

Efficiency Of Bond-Slip Response For FE Numerical Modeling Of Reinforced Concrete- A Review

Kumar,

Appa Rao

2023

Proceedings of the 11th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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The realistic response of reinforced concrete (RC) structures can be reflected through numerical modeling in finite element (FE) analysis when the true bond-slip response is assigned. The bond on rebar with the surrounding concrete prevents excessive slipping to maintain compatibility. The bond controls the stiffness and capacity of RC members, including cracking, deformations, and hysteretic response under seismic loading. This paper reports on bond-slip responses adopted between deformed rebar and concrete. The complexity of the bond-slip behavior presents a significant challenge in developing accurate bond-slip models; since the factors like rebar surface deformation and rib area, concrete strength and stiffness, rebar diameter and spacing, casting position, and confinement of the surrounding concrete influence the bond. This paper highlights different types of bond-slip models adopted by researchers, including complex cyclic bond-slip deterioration model under reverse cyclic loading. It emphasizes the application of bond-slip models to simulate the interaction between the deformed rebar and the surrounding concrete in the analysis of RC structures, as the bond stress depends on the corresponding slip. Several studies have been reported on the bondslip characteristics of deformed rebar, on its application in finite element analysis. In this study, two modeling techniques have been adopted using bond-slip characteristics of rebar in FEA of RC structures to predict crack spacing, stiffness, and deformation.

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Section: Concrete Characteristicsmentioning

confidence: 99%

Efficiency Of Bond-Slip Response For FE Numerical Modeling Of Reinforced Concrete- A Review

Kumar,

Appa Rao

2023

Proceedings of the 11th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…Therefore, the results indicate that the bond strength of the voided slab should be calculated by region. Zsutty [20] proposed the the equation for calculating the average bond stress of the deformed steel bar as shown Equation (3). In this equation, the minimum thicknesses of the cover surrounding the deformed steel bar and embedded length and diameter of deformed steel bar were considered in order to estimate the average bond stress of the deformed steel bar (𝜏 𝑎𝑣𝑔 ).…”

Section: The Bond Stress Distribution Of the Donut-type Voided Slabmentioning

confidence: 99%

Bond Characteristics of a Deformed Steel Bar Embedded in Donut-Type Voided Slab

2022

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In reinforced concrete (RC) structures, bond behavior between concrete and deformed steel bar (rebar) has a great effect on the structural behavior of members including voided slabs. According to previous research, bond behavior of a rebar in voided slabs is different from that in general RC slabs by the concrete inner cover formed between rebar and void. However, the bond characteristics of rebar in voided slabs have not been clearly verified yet. This study investigated the bond characteristics of rebar in the donut-type voided slab. Like other voided slabs, the donut-type void-shaper make concrete inner cover formed between rebar and void, and some part of the donut-type voided slab has smaller inner cover thickness than 2.5 db. Furthermore, inner cover thickness changes along the longitudinal rebar due to the shape of void. These were expected to affect the bond behavior of rebar in the donut-type voided slab. In this study, pull-out tests were performed to find out the effect of bond condition by the region due to voids. To this end, the donut-type voided slab was divided into three regions according to the shape of void, such as ‘Insufficient region’, ‘Transition region’, and ‘Sufficient region’. Main variables were inner cover thickness, embedded length, and bond location, which is affected by void shape. Bond characteristics of rebar in the donut-type voided slab were evaluated through comparison of bond stress–slip relationship, maximum bond strength, and bond stress distribution of each region. Test results showed that the average bond stress was found to be 25~50% lower than that of the general RC slab in the region of the inner cover thickness of 2.5 db, which was not satisfied due to void, and the bond stress–slip relationship and the bond stress distribution of the donut-type voided slab was also different from that of the general RC slab according to the type of bond region and inner cover thickness. In addition, the calculation method of bond strength of rebar in donut-type voided slab was proposed, which indicated that the error range between the estimated value and the experimental value was within 5%.

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“…Several research studies have studied the main parameters that influenced the performance of lap splice and determined the lap splice length of bars, known as the parameter; concrete strength, bar diameter, concrete cover, transverse steel distribution, steel bar yield strength, and spacing between splices [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Sustainability of Lap Splice in Externally Near Surface Mounted Bars of Reinforced Concrete Beam

khalil,

Farouk,

ANAN

2023

Port-Said Engineering Research Journal

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The Near Surface Mounted (NSM) is a method to strengthen and rehabilitate components of the reinforced concrete (RC) flexural and shear strength in the tension side of the concrete, it consists of positioning the reinforcement bars in grooves scratched into the concrete shell. The goal of this research program is to investigate the sustainability of near-surface mounted reinforcing bar tension lap splices in reinforced concrete members subject to monotonic loading. Nineteen concrete beams reinforced with and without spliced deformed reinforcement bars were tested in a four-point bending condition with a constant moment along the mid-span splicing region. The study's main variables were the splice length, type of splice, and diameter of the bars. The structural strength and failure modes of the tested beams are presented and addressed, the splice butt joint showed little notice before failure for none or sufficient splice duration, the adequate splice length improved the rigidity of the beam reinforcement, delayed crack forming and decreased deflection. It is found that the epoxy agent significantly reduces the length of the splice compared to that used in the Egyptian code.

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Empirical Study of Bar Development Behavior

Cited by 20 publications

References 0 publications

Efficiency Of Bond-Slip Response For FE Numerical Modeling Of Reinforced Concrete- A Review

Efficiency Of Bond-Slip Response For FE Numerical Modeling Of Reinforced Concrete- A Review

Bond Characteristics of a Deformed Steel Bar Embedded in Donut-Type Voided Slab

Sustainability of Lap Splice in Externally Near Surface Mounted Bars of Reinforced Concrete Beam

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