Influence of Concrete Strength on the StressStrain

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Influence of Concrete Strength on the Stress-Strain ...

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Influence of Concrete Strength on the Stress-Strain ...

The results show a drop in compressive strength of concrete with the increase in replacement percentage of RA. However, steel confinement has a positive role to

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Influence of high strain rates on stress–strain ...

Nov 01, 2008  The nonlinear stress–strain behavior of concrete for direct tensile loading observed by different investigators , , , , , , , .It has been shown that the strength

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Influence of concrete age on stress–strain behavior of FRP ...

Influence of concrete age on stress–strain behavior of FRP-confined normal- and high-strength concrete Author links open overlay panel Jian C. Lim Togay

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Influence of concrete age on stress–strain behavior of FRP ...

May 01, 2015  To illustrate the influence of concrete age on the ultimate condition of FRP-confined concrete, Figs. 12(a) and 13(a) show the variation of the strength and

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Influence of high strain rates on stress–strain ...

Nov 01, 2008  The nonlinear stress–strain behavior of concrete for direct tensile loading observed by different investigators , , , , , , , .It has been shown that the strength, strain and the secant modulus at peak stress, the limit of proportionality of stress and strain increase with stress rate, but the initial tangent modulus of elasticity is unaffected by stress rate.

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STRESS-STRAIN CURVE FOR CONCRETE

STRESS-STRAIN CURVE FOR CONCRETE • A typical stress-strain curve for concrete, when tested in a compression-testing machine, is shown in Fig. 3.1. • The stress and strain are approximately proportional to each other up to about half of the ultimate strength. • At higher stresses, the behavior is considerably inelastic.

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Influence of Slenderness on Stress-Strain Behavior of ...

Conversely, the influence of slenderness on axial strength enhancement of specimens with a H / D ratio between 2 and 5 was found to be negligible. The strain results indicate that hoop rupture strains along the height of CFFTs become more uniform for specimens with higher amounts of confinement.

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Theoretical Stress‐Strain Model for Confined Concrete

(1971) stress-strain equations to take into account the enhancement of both the concrete strength and ductility due to confinement and the effect of strain rate. Monotonic stress-strain equations for concrete confined by rectangular-shaped transverse reinforcement include those proposed by Vellenas et al. (1977) and Sheikh and Uzumeri (1980).

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Influence of Geometrical Parameters of the Cross Section ...

Influence of Geometrical Parameters of the Cross Section, Strength and Deformability of the Materials Used on Stress-strain State of Three-layered Reinforced Concrete Dinh Tho,

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Stress-Strain Curve for Concrete - The Constructor

Stress-strain Curve for Concrete Fig. 1 and Fig. 2 shows strain stress curve for normal weigh and lightweight concrete, respectively. There is a set of curves on each figure which represents the strength of the concrete. So, higher curves show higher concrete strength.

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(PDF) Influence of Steel Fibers on Design Stress-Strain ...

A new proposal for the realistic stress-strain curve for high-strength fiber concrete is presented and a proposal to take into account the effect of steel fibers on the design stress-strain curve ...

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STRESS-STRAIN CURVES OF CONCRETE CONFINED BY SPIRAL ...

n2 - stress-strain curves of concrete confined with spiral reinforcement were determined. the influence of compressive strength, aggregate type, and the spacing and yield strength of hoop reinforcement was investigated. a model was developed onproperties of the hoop reinforcement and constitutive relationship of plain concrete.

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Are You suprised

Figure 1.2.1 shows a typical stress-strain curve of concrete in compression, where E c = initial tangent modulus at the origin, also known as short term static modulus E s = secant modulus at A E t = tangent modulus at A ε e = elastic strain at A ε i = inelastic strain at A It is seen that the initial tangent modulus is much higher than E t (tangent ...

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Compressive behaviour of concrete at high strain rates ...

Experimental techniques commonly used for high strain-rate testing of concrete in compression, together with the methods used for measurement and recording of stress and strain, are critically assessed in the first part of this paper. The physical capability of each loading method is discussed and some consideration is given to the definitions used for specifying the loading rate. The second ...

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Stress-Strain Curves of Concrete Confined by Spiral ...

The influence of compressive strength, aggregate type, and the spacing and yield strength of hoop reinforcement was investigated. A model was developed to predict the stress-strain curves of confined concrete based on properties of the hoop reinforcement and constitu tive relationship of plain concrete.

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Influence of technological factors on the state of stress ...

Jul 01, 2006  All factors shown in the Eq (2) and their values influence the concrete shrinkage strain. Even a small deviation (from optimal values) of these factors has a larger influence on concrete shrinkage strain if compared to the concrete strength [18].

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Influence of the Saturation Ratio on Concrete Behavior ...

The concrete unconfined compressive strength increase with the loading rate observed by some authors is mainly due to the lateral confinement induced by inertial forces that depend on both the size of samples and the strain rates. Concrete is a cohesive-frictional material and thus the apparent strength depends on the mean stress.

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Numerical Evaluation of the Influence of Aggregates on ...

Jun 01, 2011  In the present study, a mesoscale concrete material model is used to simulate impact tests and to study the influences of aggregates on concrete material compressive strength increment at high strain rates. The commercial software AUTODYN is used to perform the numerical simulations.

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PAPER OPEN ACCESS Influence of Concrete Strength on the ...

Influence of Concrete Strength on the Stress-Strain Behavior of Spirally Confined Recycled Aggregate Concrete Muhammad J Munir*, Syed M S Kazmi, Yufei Wu, and Indubushan Patnaikuni

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TECHNICAL PAPER The influence of concrete

The influence of concrete compressive strength and specimen size on the compression stress block parameters of reinforced concrete F van Schalkwyk, E P Kearsley This paper describes the influence of concrete compressive strength and specimen size on the fundamental characteristics of the flexural compressive stress-strain distribution.

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STRESS-STRAIN CURVES OF CONCRETE CONFINED BY SPIRAL ...

n2 - stress-strain curves of concrete confined with spiral reinforcement were determined. the influence of compressive strength, aggregate type, and the spacing and yield strength of hoop reinforcement was investigated. a model was developed onproperties of the hoop reinforcement and constitutive relationship of plain concrete.

Get price

Influence of Geometrical Parameters of the Cross Section ...

Influence of Geometrical Parameters of the Cross Section, Strength and Deformability of the Materials Used on Stress-strain State of Three-layered Reinforced Concrete Dinh Tho,

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Influence of the Saturation Ratio on Concrete Behavior ...

The concrete unconfined compressive strength increase with the loading rate observed by some authors is mainly due to the lateral confinement induced by inertial forces that depend on both the size of samples and the strain rates. Concrete is a cohesive-frictional material and thus the apparent strength depends on the mean stress.

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Stress–strain modeling of high-strength concrete by the ...

Sep 21, 2013  In this study, an adaptive network-based fuzzy inference system (ANFIS) approach is presented for modeling of high-strength concrete under uniaxial loading. The ANFIS approach applied to test the data of concrete cylinder test is available in the literature. In this paper, the stress–strain behavior of high-strength concrete subjected to axial load is obtained by using the ANFIS model. It is ...

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DEFINING YIELD STRENGTH FOR NONPRESTRESSED

The objective of the research was to assess the influence of stress-strain curve shape and the method of determining yield strength reinforcing steel on the of strength of computed reinforced concrete sections. This was accomplished by analyzing a range of beam and column cross sections and comparing the calculated strengths with calculated

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Influence of technological factors on the state of stress ...

Jul 01, 2006  All factors shown in the Eq (2) and their values influence the concrete shrinkage strain. Even a small deviation (from optimal values) of these factors has a larger influence on concrete shrinkage strain if compared to the concrete strength [18].

Get price

Compressive behaviour of concrete at high strain rates ...

Experimental techniques commonly used for high strain-rate testing of concrete in compression, together with the methods used for measurement and recording of stress and strain, are critically assessed in the first part of this paper. The physical capability of each loading method is discussed and some consideration is given to the definitions used for specifying the loading rate. The second ...

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Creep of Concrete: Factors, Measurement and Magnitude ...

This stress/strength ratio exists in the region of 0.8 to 0.9 of the short term static strength. 6. Effect of Strength of Concrete on Creep: It has observed that the strength of concrete has a considerable effect on the creep with in a wide range. Creep has been found inversely proportional to the strength of the concrete at the time of ...

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Size effect modelling for dynamic biaxial compressive ...

The influences of stress ratio, strain rate and content of steel fibers on the mechanical properties of concrete such as ultimate compressive strength and stress-strain curve were investigated.

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MODULE – I STRESS – STRAIN CHARACTERISTIC OF CONCRETE ...

The stress-strain curve in tension is generally approximated as a straight line from the origin to the failure point. The modulus of elasticity in tension is taken to be the same as that in compression. As the tensile strength of concrete is very low, and often ignored in design, the tensile stress-strain relation is of little practical value.

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Influence of Steel Fibers on Strain-Softening of High ...

Jan 01, 1993  Special attention is paid to the descending part of the stress-strain curve, which is known to be very steep for high-strength concrete. Addition of steel fibers has a beneficial effect on the strain-softening behavior and significantly increases the toughness, as measured by the area under the stress-strain

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The Inelastic Deformation of Concrete

load, low-strength concrete and specimens of smaller height-width ratio possess greater load resistance. Age and strength also influence the shape of the stress-strain curve. The elastic modulus based on total strain is about 55 to 80 percent of that obtained from strains in the central part. The presence of the falling branch suggests ...

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