Publications

Shear Strength of Reinforced Concrete: Part I—Membrane Elements Subjected to Pure Shear

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Near Surface Mounted Shear Strengthening of Reinforced Concrete Beams

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Minimum Transverse Reinforcement in 65 Mpa Concrete Beams

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Shear strength of plain concrete made of recycled low-strength concrete aggregates and natural aggregates

Shear-Transfer Capacity of Reinforced Concrete

Shear strength of recycled aggregate concrete beams containing stirrups

Simplified design and capacity calculations of shear strength in reinforced concrete membrane elements

A unified approach to shear and torsion in reinforced concrete

Reinforced concrete (RC) beams can be subjected to a complex combination of shear forces (V), torsional moments (T), flexural moments (M) and axial loads (N). This paper proposes a unified approach for the analysis of these elements. An existing model for the analysis of orthogonally reinforced concrete membrane elements subjected to in-plane shear and normal stresses is generalized to apply to the case of beams subjected to the complex loading. The combination of V and T can be critical. Torsion is modelled using the hollow-tube analogy. A direct equation for the calculation of the thickness of the equivalent hollow tube is proposed, and the shear stresses caused by V and T are combined using a simple approach. The development and the evaluation of the model are described. The calculations of the model are compared to experimental data from 350 beams subjected to various combinations of stress-resultants and to the calculations of the ACI and the CSA codes. The proposed model provides the most favorable results. It is also shown that it can accurately model the interaction between V and T. The proposed model provides a unified treatment of shear in beams subjected to complex stress-resultants and in thin membrane elements subjected to in-plane stresses.

Torsional strength of reinforced concrete beams

A simple method for predicting the ultimate strength and mode of failure of reinforced concrete beams subjected to pure torsion is presented. This method is an extension of a recently developed method for predicting the strength of membrane elements subjected to pure shear that was also applied to beams subjected to combined shearing forces, bending moments, and axial loads. The torsional strength is related to the amounts of transverse and longitudinal reinforcement and to the concrete strength. To check the adequacy of this simple method, the calculated strength and mode of failure are checked against the experimental results of 66 beam tests available in the literature, and good agreement is found. The simplicity of the method is illustrated by an example.Key words: beams, building codes, mode of failure, reinforced concrete, shear, strength, torsion.

Cracked Transformed Moment of Inertia of SteelReinforced and FRP-Reinforced Rectangular Beams and Slabs

Cracking in reinforced concrete (RC) slabs and beams subjected to flexural moments reduces their flexural stiffness significantly.At service load conditions, deflections are typically calculated using the effective moment of inertia ( ), which is calculated based on the gross moment of inertia ( ) and the cracked moment of inertia ( ).The latter is based on the transformed properties of the cross-section and requires the calculation of the depth of the compression zone () then the calculation of the moment of inertia.This paper shows that ( ) depends solely on the modular reinforcement ratio ( ) where () is the reinforcement ratio and () is the modular ratio of the reinforcement relative to the concrete.It has been proposed in a previous study that ( ) ranges from 0.005 to 0.16.This range covers the properties of beams and slabs with concrete compressive strength ( ′ ) ranging from 20 to 60 MPa and with reinforcement ratio ranging from minimum to maximum values allowed by the ACI 318 building code.It also covers a wide range of beams and slabs reinforced with FRP bars.Within such a range of ( ), it will be shown that ( ) can be calculated directly using ( = 0.36 ( ) 0.81 3 ), where () and () are the width and effective depth of the cross-section respectively.The error between the exact and the approximate equation is limited.Based on this approximate equation, it is shown that the flexural stiffness of fully cracked elements depends on the ratio and the modulus of elasticity of the reinforcement raised to the power 0.8 and to () raised to the power 2.2.In addition, it is shown that the effect of ( ′ ) on the flexural stiffness is limited.

Shear Tests of Epoxy-Modified Reinforced Concrete Beams

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Shearing strength of plain concrete based of push off tests

This paper present the results of an experimental investigation of the shearing strength of plain concrete based on pushoff type of tests. Twenty pushoff specimens with compressive strengths ranging from 19 to 66 MPa were cast and tested to failure. The results indicate that the cracking shearing strength increase with the increase in compressive strength. However, the rate of increase diminishes as the compressive strength increases. An equation relating the cracking shearing strength to the compressive strength of the concrete is proposed. This equation can be used to calculate the cracking shear stresses in elements which are commonly designed using the shear-friction model.

Evaluation of AASHTO-LRFD General Procedure for Torsion and Combined Loading

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Simple Model for Predicting Torsional Strength of Reinforced and Prestressed Concrete Sections

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TRANSVERSELY STIFFENED GIRDER WEBS SUBJECTED TO COMBINED IN-PLANE LOADING.

Keywords HOWARD HUMPHREYS, SURREY UNIVERSITY TRANSVERSELY, STIFFENED, GIRDERS, WEBS, COMBINED, IN PLANE, LOADING, NON LINEAR, FINITE ELEMENTS, ANALYSIS, LOADS, PARAMETRIC, STUDIES, EFFECT, SHEAR, DIRECT, BEHAVIOUR, TRANSVERSE, STIFFENERS, GEOMETRICAL, MATERIALS, PARAMETERS, DEFLECTION, PEAK, CAPACITY, PLATES, ANALYTICAL, MODELS, SOLUTIONS, DESIGN, COMPUTERS, PACKAGES, VALIDATION, COMPRESSION, IMPERFECTIONS, RIGIDITY, INTERACTIVE, STRESS, STATE... Show All

TRANSVERSELY STIFFENED GIRDER WEBS SUBJECTED TO SHEAR LOADING - PART 1 : BEHAVIOUR.

Keywords SURREY UNIVERSITY TRANSVERSE, WEBS, BEHAVIOUR, ANALYSIS, GEOMETRY, PROPERTIES, DEFLECTION, VARIATIONS, STRESS, DESIGN, SIZE, STIFFENED, SHEAR, NON LINEAR, PARAMETRIC, PANELS, INITIAL, PEAK, MATERIALS, BENDING, MODELS, GIRDERS, LOADS, NUMERICAL, EFFECT, STIFFENERS, IMPERFECTIONS, CAPACITY, YIELD, RIGIDITY, SLENDERNESS... Show All

Shear Behavior of Reinforced Concrete Beams with Variable Thickness of Concrete Side Cover

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THE ANALYSIS AND DESIGN OF STIFFENED PLATE BRIDGE COMPONENTS. IN: STRUCTURAL STABILITY RESEARCH COUNCIL. 1990 ANNUAL TECHNICAL SESSION, STABILITY OF BRIDGES, ST. LOUIS, MISSOURI, APRIL 10-11, 1990

This paper presents recent research on the behavior and design of orthogonally stiffened compression flanges and transversely stiffened webs of steel bridge girders. A non-linear finite element package has been used to examine the collapse behavior of a wide range of stiffened plate geometries. In the case of the stiffened compression flanges, design formulations have been developed based on established approaches and the design curves validated using the numerical results. For the transversely stiffened webs, the analysis results have been used to define the destabilizing loads acting on the stiffeners and the collapse characteristics of the stiffened plates. A simple design requirement has then been developed which gives an optimum stiffener section at which yield of the stiffener outstand and collapse of the plate panel occurs simultaneously. Analyses in both areas have been validated by comparison with previous analyses with other numerical packages and with available experimental results.