Analysis of photographically measured crack development from shear tests on large bridge girders

Sun, Shaoyun; Kuchma, Daniel A.; Kim, Kang Su

doi:10.15554/pcij.06012009.81.98

Cited by 2 publications

(3 citation statements)

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“…This steep inclination angle of the flexure‐shear crack can be identified from the shear tests of RC continuous beams conducted by Kupfer and Baumann and Vaz Rodrigues . According to experimental studies conducted by Dowell and Auer and Sun et al , the steep shear cracks were also observed in the PSC beams subjected to large bending moment combined with shear force.…”

Section: Proposed Model – Dual Potential Capacity Modelmentioning

confidence: 88%

“…, in Kani 's tooth model and Reineck ' s mecha nical tooth model , the shear behaviour or shear failure of the RC beam was explained based on flexural‐shear cracking behaviour. As is well known, whereas the web shear strength of concrete members can be determined theoretically and rather easily, the flexural‐shear behavioural mechanism is a very complex and troublesome problem . At a certain load level, flexural cracks occur when the tensile stress induced by flexure exceeds the cracking strength of the concrete on the tension side of the section, where the flexural cracks cannot propagate into the compression zone above the neutral axis.…”

Section: Proposed Model – Dual Potential Capacity Modelmentioning

confidence: 99%

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Dual potential capacity model for reinforced concrete beams subjected to shear

Lee

Han

Kim

2016

Structural Concrete

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The shear resistance mechanisms of a reinforced concrete (RC) member with shear reinforcement can be divided into the contributions of concrete and shear reinforcement. The shear resistance mechanisms of concrete can be further divided into the shear resistance of intact concrete in the compression zone, the aggregate interlock in the cracked tension zone, and the dowel action of the longitudinal tension reinforcement. In this study, the shear demand curves and potential shear capacity curves for both tension and compression zones were derived with the assumption that the shear failures of RC members are dominated by the flexural-shear strength. On this basis, the shear capacity model was also proposed. In the proposed model, the crack width and the local stress increase in reinforcements were calculated based on the bond behavior between the reinforcement and its surrounding concrete, and the crack concentration factor was introduced to consider the formation and propagation of the critical shear crack developed from the flexural cracks. A total of 940 shear test results was collected and compared with the analysis results provided by the proposed model, and it was demonstrated that the proposed model provided a good estimation on the shear strengths of RC beams.

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Section: Proposed Model – Dual Potential Capacity Modelmentioning

confidence: 88%

Section: Proposed Model – Dual Potential Capacity Modelmentioning

confidence: 99%

Dual potential capacity model for reinforced concrete beams subjected to shear

Lee

Han

Kim

2016

Structural Concrete

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“…A s and A v are the areas of the longitudinal and transverse reinforcements, respectively; f vy is the yield strength of the transverse reinforcement; b w is the web width; d s is the effective member depth; c is the neutral axis depth estimated from the flexural analysis; and u is the inclination angle of the critical shear crack that can be taken as 45°or 60°for the critical sections located at d s from the support or the loading points, respectively (Dowell and Auer, 2011;Lee et al, 2016;Reineck, 1991;Sun et al, 2009). The tensile stress of the longitudinal reinforcement in the cracked interface (f sx, max ) can be determined from a typical nonlinear moment-curvature analysis, and the tensile stress in the longitudinal reinforcement between the flexural cracks (f sx, min ) can be calculated from the bond-slip relationship between the longitudinal reinforcement and surrounding concrete.…”

Section: Respectively;mentioning

confidence: 99%

Shear crack concentration in reinforced concrete beams subjected to shear and flexure

Lee

Han

Joo

et al. 2019

Advances in Structural Engineering

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The dual potential capacity model was developed in the authors’ previous studies to estimate the shear strengths of reinforced concrete members, in which the shear crack concentration factor was adopted as the key concept of the proposed approach. In this study, a shear test program was carefully prepared and conducted on five reinforced concrete beam specimens to investigate the crack development, propagation, and merging behavior of critical shear cracks. To this end, concrete cover thickness, diameter of reinforcement, presence of skin reinforcement, and shear reinforcement ratio were taken as the main test variables. From the experiments, the crack merging and concentration phenomena were clearly observed, and the crack concentration factors were estimated from the measured flexural and shear crack widths and spacings. The crack concentration factors were compared to those estimated by the dual potential capacity model, and the shear strengths of the test specimens were also compared with those estimated by the dual potential capacity model and other models in detail.

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Analysis of photographically measured crack development from shear tests on large bridge girders

Cited by 2 publications

References 0 publications

Dual potential capacity model for reinforced concrete beams subjected to shear

Dual potential capacity model for reinforced concrete beams subjected to shear

Shear crack concentration in reinforced concrete beams subjected to shear and flexure

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