Flexural behaviour of RC beams strengthened with high-tension steel rod

Shin, Kyung‐Jae; Lee, S.-H.

doi:10.1680/macr.2008.62.2.137

Cited by 14 publications

(7 citation statements)

References 6 publications

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“…(2) (a) beams (Ashour, 2000;Debernardi and Taliano, 2002;Fathifazl et al, 2009;Ko et al, 2001;Lam et al, 2008;Lee et al, 2009;Pecce and Fabbrocino, 1999;Shin and Lee, 2010;Shin et al, 2007) (b) columns subjected to low axial load level (0 , P/A g f 9 c < 0 . 2; A g is the column cross-section area) (Ho and Pam, 2003a;Marefat et al, 2005;Mo and Wang, 2000;Tao and Yu, 2008;Watson and Park, 1994;Woods et al, 2007) (c) columns subjected to medium axial load level (0 .…”

Section: Derivation Of Equivalent Rectangular Concrete Stress Block Pmentioning

confidence: 99%

Equivalent stress block for normal-strength concrete incorporating strain gradient effect

Peng

Pam

et al. 2012

Magazine of Concrete Research

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To account for the different behaviours of concrete under uniaxial compression and bending in the flexural strength design of reinforced concrete (RC) members, the stress-strain curve of concrete is normally scaled down so that the adopted maximum concrete stress in flexural members is less than the uniaxial strength. However, it was found from previous experimental research that the use of a smaller maximum concrete stress would underestimate the flexural strength of RC beams and columns. To investigate the effect of strain gradient on the maximum concrete stress developed in flexure, a total of 12 plain concrete and RC inverted T-shaped specimens were fabricated and tested under concentric and eccentric loads separately. The maximum concrete stress developed in the eccentric specimens was determined by modifying the concrete stress-strain curve obtained from the counterpart concentric specimens based on axial force and moment equilibriums. The test results revealed that the maximum concrete stress increases with strain gradient up to a certain maximum value. A formula was developed to correlate the maximum concrete stress to strain gradient. A pair of equivalent rectangular concrete stress block parameters that incorporate the effects of strain gradient was proposed for flexural strength design of RC members.

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Section: Derivation Of Equivalent Rectangular Concrete Stress Block Pmentioning

confidence: 99%

Equivalent stress block for normal-strength concrete incorporating strain gradient effect

Peng

Pam

et al. 2012

Magazine of Concrete Research

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“…To validate the obtained equivalent rectangular concrete stress block parameters, the proposed values of α and β given, respectively, in Equations (6a) and (6b), as well as the proposed value of ϵ cu = 0.0031, are used to evaluate the flexural strengths of RC beams tested by other researchers (Pecce and Fabbrocino, 1999; Ashour, 2000; Ko et al , 2001; Debernardi and Taliano, 2002; Shin et al , 2007; Lam et al, 2008; Fathifazl et al , 2009; Lee et al , 2009b; Shin and Lee, 2010). These predicted flexural strengths M p are compared with their respective measured strengths M t , as well as with their respective theoretical strengths based on various RC design codes, i.e.…”

Section: Proposed Equivalent Rectangular Stress Block For Nscmentioning

confidence: 99%

Strain gradient effects on flexural strength design of normal‐strength concrete beams

Peng

2010

Structural Design Tall Build

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SUMMARYIn the flexural strength design of normal‐strength concrete (NSC) beams, the resultant concrete force and its centroid within the compression zone is generally expressed in an equivalent rectangular stress block. The equivalent concrete stress is expressed as , where is the uni‐axial concrete cylinder strength. Currently, the value of α stipulated in various design codes for NSC is taken as 0.85. Nonetheless, in an experimental study conducted earlier by the authors on NSC columns subjected to concentric and eccentric axial loads, it was found that the value of α significantly depends on strain gradient, which generally increases as strain gradient increases until it reaches a maximum value. Therefore, strain gradient is a critical factor and should be considered in the flexural strength design of NSC members. In this paper, a new flexural strength design method that incorporates the effects of strain gradient is developed for NSC beams. An equivalent rectangular concrete stress block, which is strain‐gradient dependent, is proposed and applied to produce a set of equations for the flexural strength design of singly and doubly reinforced NSC beams with various concrete strengths. Lastly, these equations are converted into charts for practical design application. Copyright © 2010 John Wiley & Sons, Ltd.

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“…Several techniques have been investigated for strengthening of reinforced concrete (RC) beams, including External Post-Tension (EPT) [1][2][3][4], Fiber Reinforced Polymers (FRP) [5][6], Bolted-Steel Plate (BSP) [7], and concrete jacketing [8].…”

Section: Introductionmentioning

confidence: 99%

“…In the later, the unbonded external rods or tendons are anchored at the ends of the RC beam and post-tensioned by anchor wedges or turnbuckles. The important issue with this technique is that the yielding of the unbonded rod or tendon is not achieved during the failure stages unless sufficient initial pretension is applied [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Shear Behavior of RC Deep Beam Strengthened by V-Shaped External Rods

Rai

Phuvoravan

2020

Int. j. eng. technol. innov.

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This research investigated the shear strengthening technique of Reinforced Concrete (RC) deep beams using a V-shaped external rod system. Shear behavior, the stress in an external rod, and the shear capacity at the diagonal shear failure of a strengthened beam were focused mainly. Experimental tests of control and two strengthened beams were carried out to observe the effect of the external rod on shear behavior of RC deep beam. A theoretical approach to compute the stress in the external rod and the nominal strength of the strengthened beam in the diagonal shear failure were examined based on the experimental test results and verified using Finite Element Method (FEM) in ABAQUS. The computed nominal shear strength of the strengthened beam was 10% higher than the experimental test. The strengthening technique shifted the brittle shear failure to ductile shear failure and improved the performance of RC deep beam.

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Flexural behaviour of RC beams strengthened with high-tension steel rod

Cited by 14 publications

References 6 publications

Equivalent stress block for normal-strength concrete incorporating strain gradient effect

Equivalent stress block for normal-strength concrete incorporating strain gradient effect

Strain gradient effects on flexural strength design of normal‐strength concrete beams

Shear Behavior of RC Deep Beam Strengthened by V-Shaped External Rods

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