Ultimate Strength and Design of Reinforced Concrete Beams in Torsion and Bending

Lampert, Paul; Thürlimann, Bruno

doi:10.1007/978-3-0348-5954-7_1

Cited by 25 publications

(15 citation statements)

References 3 publications

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“…The post-cracking torsional rigidity of a concrete beam is provided by the outer thin-walled layer of concrete surrounding the corner longitudinal bars and stirrups. A three-dimensional model called the thin-walled tube, space truss model was used by Lampert (1973) and Hsu (1973) to develop the post-cracking torsional rigidity of rectangular reinforced concrete beams. Later, Tavio and Teng (2004) simplified the rigidity expression developed by Hsu (1973) and proposed a new expression.…”

Section: Analytical Methods For Predicting Lateral Torsional Bucklingmentioning

confidence: 99%

“…where A 2 is the area bounded by the lines connecting the centers of the longitudinal corner bars; p 2 is the perimeter of the area bounded by the lines connecting the centers of the corner bars; λ is a multiplier for the concrete strain [λ=3 according to Lampert (1973)]; n is the modular ratio of steel to concrete; t i is the wall thickness of the tube.…”

Section: Post-cracking Torsional Rigiditymentioning

confidence: 99%

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Lateral Torsional Buckling of Rectangular Reinforced Concrete Beams

2014

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Crane; former fellow graduate students Murat Engindeniz and Felix Kim; former undergraduate assistants Andrew Cao and Luis Fajardo and other people without whose helping hand the author could not conduct the experiments. Special thanks are due to fellow graduate students Mustafa Can Kara and Towhid Bhuiyan for their tremendous help and support during the course of the experiments. This dissertation is dedicated to the family of the author, whose support and love made this dream possible. The author feels indebted to his parents Müzeyyen and İsmail v Kalkan and his brother Murat Kalkan for their unconditional love and unlimited support particularly at difficult times. Financial support provided for the experiments by Georgia Department of Transportation (GDOT) is gratefully acknowledged. The author would like to express his appreciation to Kırıkkale Üniversitesi, Turkey for providing financial support to the author during the course of his dissertation. Thanks are also due to Dr. Mustafa Y. Kılınç, Dr. Osman Yıldız and Dr. Orhan Doğan for their support during this study. vi

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Section: Analytical Methods For Predicting Lateral Torsional Bucklingmentioning

confidence: 99%

Section: Post-cracking Torsional Rigiditymentioning

confidence: 99%

Lateral Torsional Buckling of Rectangular Reinforced Concrete Beams

2014

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“…This pioneering work was later refined by Rausch (1953), Kupfer (1964) and Leonhardt (1965). Lampert and Thurliman (1971) and several others have provided a foundation for truss models by means of the theory of plasticity. The truss model approach was extended to overall structures in the form of strut-and-tie systems by Schlaich et al (1987).…”

Section: Research Significancementioning

confidence: 99%

Influence of stirrup spacing on shear resistance of reinforced concrete beams

Murty¹,

PapaRao²

2013

Magazine of Concrete Research

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This study investigates the behaviour of, and evaluates the benefit accruing to, shear critical reinforced concrete beams, when provided with vertical stirrups spaced at decreasing intervals along the axis of the beam, but with the same amount of web reinforcement per unit beam length. Tests are carried out on three reinforced concrete beams, identical in geometry, flexural reinforcing, amount of web reinforcement per unit span length, material properties and test details. The only varable is vertical stirrup leg spacing along the span. The beams are loaded at half point on a simple span of 2500 mm and all fail in shear. Experimental results demonstrate that, as stirrup spacing decreases, there is a strength gain at ultimate. Besides increased carrying capacity, closer spacing of shear reinforcement results in more beneficial deformational characteristics. Transverse deflections and crack widths decrease as stirrup spacing decreases. The test results establish the desirability of using stirrup reinforcement in practice at as close an interval as possible, along the member length, keeping the amount of web reinforcement per unit length unaltered. This beneficial aspect of using closer stirrup leg spacing than the maximum permitted by codes is not found in the available national building codes for structural concrete. Notation d effective depth of the beam f 1 c cylinder compressive strength (psi) Research significanceAn accurate mathematical model to represent shear in concrete structures is still elusive, despite many decades of experimental research and the use of highly sophisticated analytical tools. Consequently, shear design of concrete beams remains empirical. The search for better design methods is still a preoccupation of many researchers. Research on simpler, more convenient and effective stirrup detailings than the conventional closed stirrups has been meagre to date. Behra and Rajagopalan (1969) pioneered notable research in this area. In three beams, in place of conventional closed stirrups, two-piece stirrups were tried. Lap in one beam was provided in the top face, but adequate development length was not there, with the wrong assumption that maximum stress occurred only at the stirrup mid-height; failure was at 95% of its rated shear. In another beam, lap was provided on the side faces and a lap length of 171 mm for 6-mm stirrups was not adequate; it was reported to fail at 89% of total strength. The final conclusion was that the slight loss of ductility and strength in the two-piece stirrup could be taken care of by more effective lap length.

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“…Rausch [15], Kupfer (1964) and Leonhardt [9]. Lampert and Thurliman [8] and several others have provided a foundation for truss model by means of the theory of plasticity. The truss model approach was extended to overall structures in the form of strut and tie systems by Schlaich [16].…”

Section: Research Significancementioning

confidence: 99%

Influence of stirrup spacing on shear resistance and deformation of reinforced concrete beams

Latha¹,

Revanasiddappa²,

M³

2018

IJET

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An experimental investigation was carried out to study shear carrying capacity and ultimate flexural moment of reinforced cement concrete beam. Two series of simply supported beams were prepared by varying diameter and spacing of shear and flexural reinforcement. Beams of cross section 230 mm X 300 mm and length of 2000 mm. During testing, maximum load, first crack load, deflection of beams were recorded. Test results indicated that decreasing shear spacing and decreasing its diameter resulted in decrease in deflection of beam and increase in bending moment and shear force of beam.

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Ultimate Strength and Design of Reinforced Concrete Beams in Torsion and Bending

Cited by 25 publications

References 3 publications

Lateral Torsional Buckling of Rectangular Reinforced Concrete Beams

Lateral Torsional Buckling of Rectangular Reinforced Concrete Beams

Influence of stirrup spacing on shear resistance of reinforced concrete beams

Influence of stirrup spacing on shear resistance and deformation of reinforced concrete beams

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