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Torsional Strengthening of Reinforced Concrete Beams with

Strengthening of reinforced concrete beams subjected to

The proposed techniques to repair concrete members such as steel plates, fiber-reinforced polymers or concrete have important deficiencies in adherence and durability. The use of ultra high performance fiber concrete (UHPFC) can overtake effectively these problems. In this paper, the possibility of using UHPFC to strengthen reinforced concrete beams under torsion is investigated.

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Reinforced Concrete beams - Structural Engineer Calcs

Reinforced concrete beams are structural elements that designed to carry transverse external loads. The loads cause bending moment, shear forces and in some cases torsion across their length. Moreover, concrete is strong in compression and very weak in tension. Thus, Steel reinforcement used to take up tensile stresses in reinforced concrete beams.

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Evaluation of Ultimate Strength of Reinforced Concrete

Jan 01,  · The ultimate torque of reinforced concrete (RC) members strengthened with fiber reinforced polymer (FRP) sheets does not only depend on the torque of RC members, but also on the FRP contribution to the torque. For structural design, predicting the accurate torsional capacity of the strengthened beams is considerably important.

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Torsional Behavior of High Strength Concrete Members

Twelve mixing steel fibers-reinforced high strength concrete beams were experimentally tested under pure torsion to investigating the concrete member torsional behavior. The first cracking torque, ultimate torsional resistance, crack patterns, effect of steel fiber ratio, effects of shape and size of hollow cross-section, and effect of stirrups reinforcement were discussed.

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Torsion Design Of Prestressed Concrete - PCI

Design provisions for torsion in reinforced concrete members have been developed and included in the ACI 318-71 Building Code. These provisions are not applicable to prestressed concrete. Based on a thorough review of available research data on torsion in prestressed concrete, this paper proposes an extension of the ACI design procedures to

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Torsional behaviour of high strength concrete beams with

The torsional behaviour of high-strength concrete beams that are transversely reinforced with continuous spiral reinforcement is experimentally investigated in this research. Seventeen specimens are divided into four groups according to their concrete strength: 25, 50, 60, and 70 MPa.

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Torsional Behavior of Reinforced Concrete Beams - S

Keywords: Composites, Fiber Reinforced Polymer, Reinforced Concrete Beam, Strengthening, Torsional Moments, Twist Deformation. 1 INTRODUCTION Modern civilization relies upon the continuing performance of its civil engineering infrastructure ranging from industrial buildings to power stations and bridges.

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PDF Design of Reinforced Concrete Beams With Web Openings

opening in an already constructed beam and how to deal with multiple openings. It has been shown that the design method for beams with large openings can be further simplified without sacrificing rationality and having unreasonable additional cost. Keywords: beams (reinforced concrete); opening; serviceability; strength; structural design. 1.

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Effects of Thickness of Ultra High-Performance Fiber

Abstract: Two groups of rectangular beams, comprising of six specimens, the first group (L) were provided with four longitudinal bars, one at each corner while the second groups of beams (S) were fully reinforced with longitudinal bars and transverse reinforcement. Each group consisted of three beams. Two beams have been strengthened with ultra high performance fiber concrete (UHPFC) on four

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PDF Behavior of Reinforced Concrete Beams with effect of

strength of reinforced concrete beams. It was observed that the using wrapping configuration were very effective especially for fully wrapped beams which give behavior better than the beams reinforced with stirrups. It was shown from all the tests, the applicability of using FRP to improve the torsional resistance of reinforced concrete beams.

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7. Analysis and Design for Torsion. Analysis and Design

1. Calculations of torsional strength is controlled only by the. Calculations of torsional strength is controlled only by the strength of reinforcement, independent of concrete strength. Fdoes not reflect the effect of higggher concrete strength. 2. Greatly underestimates torsional capacity Theory of Reinforced Concrete and Lab II. Fall 2007

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Using a Hybrid Neural Network to Predict the Torsional

This study proposes a multilayer perceptrons neural network with genetic algorithm (GA-MLP) for predicting the torsional strength of reinforced concrete beams. Genetic algorithm is used to determine the optimum number of inputs and hidden nodes of a feedforward neural network, the optimum slope of the activation function, and the optimum values of the learning rates and momentum coefficients.

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Top PDF Experimental behaviour of high-strength concrete

The effect of concrete com- pressive strength on the torsional behaviour of rein- forced concrete beams was investigated by Rasmus- sen & Baker (1994, 1995a, 1995b). The results of that investigation showed a significant effect of con- crete strength on crack width, torsional stiffness, and torsional capacity of the test beams .

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Reinforced Cement Concrete Design | Concrete Civil Engineering

Reinforced Cement Concrete Design. Concrete is a stone like substance obtained by permitting a carefully proportioned mixture of cement, sand and gravel or other aggregate and water to harden in forms of the shape and of dimensions of the desired structure. Since concrete is a brittle material and is strong in compression.

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Design of Doubly Reinforced Concrete Rectangular Beams

If the calculated reinforcement ratio (p) of the beam under consideration is greater than (p max), it should be designed as a doubly reinforced concrete beam.The ACI 318-19 has also determined the maximum reinforcement ratio (p max) that can be put into a doubly reinforced concrete beam to ensure steel bars in the beam's tension zone yield.Therefore, the (p max) ensures that the beam fails by

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Torsion Of Reinforced Concrete Beams

analyzing a reinforced concrete member. In the second part we will present the results of the experiments made on 15 reinforced concrete and unreinforced concrete beams loaded by pure torsion, and compare the results obtained by the above mentioned methods with the

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