Response of Rectangular Reinforced Concrete Beams with Web Reinforcement to Torsional Stress Reversal in Combined Torsion, Moment and Shear PDF Download
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Author: Rasaki Afolabi Lasisi
Publisher:
ISBN:
Category : Strains and stresses
Languages : en
Pages : 230
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Author: Rasaki Afolabi Lasisi
Publisher:
ISBN:
Category : Strains and stresses
Languages : en
Pages : 230
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Author: Arthur Edward McMullen
Publisher:
ISBN:
Category : Concrete beams
Languages : en
Pages : 0
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The primary objective of this investigation was to study the behavior of reinforced concrete beams subjected to combined loading with particular regard to their behavior at failure. The experimental phase of this investigation consisted of testing 34 reinforced concrete beams. Twenty two beams were subjected to various combinations of bending and torsion and twelve were subjected to various combinations of bending, torsion and shear. All beams had a nominal cross section of 6" x 12" and a nominal concrete strength of 5000 psi. Both longitudinal and transverse reinforcement in various combinations was provided in all beams. The testing equipment that was designed and fabricated for this investigation permitted independent application of the twisting and transverse loads. The ratio between the twisting moment and the bending moment could be changed at any time during a test. All beams were tested to failure by applying the load in a series of increments. Each increment consisted of increasing to a predetermined level the transverse load or the twisting load or both, depending on the type of test. In the cases where both types of load were applied in the same increment, the transverse load was applied first. Twenty nine beams were subjected to loads such that for any one test the ratio of twisting moment to bending moment at the end of each increment was a constant. For the other five beams this ratio was different at the end of each increment and four of these beams were subjected to various sequences of load. Based on the observations made in the experimental phase of this investigation three idealized failure surfaces have been presented, two of which were first suggested by Lessig. Equations for the ultimate torsional strength of a beam based on each of the three failure surfaces have been developed and their method of solution has been presented. These equations have also been simplified and an interaction diagram consisting of three straight lines has been presented along with the applicable equations. The correlation between the experimental results of 109 beams and the theoretical results obtained from both the simplified analysis and the more comprehensive analysis has been given. Of these beams, 34 are the beams tested in this investigation and 75 are beams that have been tested by other investigators. The observations and test results indicate that reinforced concrete beams that are subjected to bending, torsion and moderate amounts of transverse shear can fail by three different modes. These modes of failure are characterized by the formation of a hinge adjacent to one face of the beam and yielding of the reinforcement adjacent to the face opposite to the hinge. The modes of failure predicted by the analysis agree with the observed modes of failure.
Author: R. A. Swann
Publisher:
ISBN:
Category : Architecture
Languages : en
Pages : 18
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Author: D. L. Osburn
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 48
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Fiber Reinforced Polymer (FRP) as an external reinforcement is used extensively to deal with the strength requirements related to flexure and shear in structural systems. But the strengthening of members subjected to torsion is explored only recently. Torsion failure is an undesirable brittle form of failure which should be avoided specially in the earthquake prone areas. In the present work, the behaviour and performance of rectangular reinforced concrete beams strengthened with externally bonded Glass Fibre Reinforced Polymer (GFRP) fabrics subjected to combined flexure and torsion is studied experimentally. Rectangular RC beams externally bonded with GFRP fabrics were tested to failure using an arrangement which transfer torque to the central part of the beam through two opposite cantilevers called moment arms. Each arm is subjected to equal static loading during the experiment. Total nine RC beams were cast and tested for the study. All the beams were designed to fail in torsion. One of the beam was used as a control beam and eight beams were strengthened using different configurations and different types of GFRP fabrics. The study is restricted to continuously wrapped GFRP fabrics. Experimental data on ultimate & first cracking loads, angle of twist and failure modes of each of the beams were obtained. The effect of different types and configuration of GFRP on first crack load, ultimate load carrying capacity and failure mode of the beams were investigated. The experimental results have been validated with finite element analysis by using ANSYS software and found to be in good agreement with analytical values. The experimental results show that externally bonded GFRP can increase the torsional capacity of the beam significantly. The results also indicate that the most effective configuration is the full-wrap of GFRP fabrics. In addition GFRP applied in 450 with axis of the beam gives more strength than GFRP applied in 900 with the axis of the beam.
Author: I. Devonport
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages :
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Author: Shahriar Shahriar
Publisher:
ISBN:
Category :
Languages : en
Pages : 678
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Author: American Concrete Institute
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 694
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Author: S. Chockalingam
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: J. Grob
Publisher: Birkhäuser
ISBN: 3034853378
Category : Science
Languages : en
Pages : 16
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