Stress-Strain Model for Various Unconfined Concretes in Compression

Yang, Keun–Hyeok; Mun, Ju–Hyun; Cho, Myung-Sug; Kang, Thomas H.‐K.

doi:10.14359/51686631

Cited by 35 publications

(64 citation statements)

References 13 publications

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“…The stress-strain behaviour of unconfined concrete proposed by Yang et al [37] has been adopted in this study to model the behaviour of unconfined concrete cover. …”

Section: Unconfined Concretementioning

confidence: 99%

Axial load-axial deformation behaviour of circular concrete columns reinforced with GFRP bars and helices

Karim

Sheikh

Hadi

2016

Construction and Building Materials

117

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Fibre Reinforced Polymer (FRP) bars has attracted a significant amount of research attention in the last three decades to overcome the problems associated with the corrosion of steel reinforcing bars in reinforced concrete members. A limited number of studies, however, have investigated the behaviour of concrete columns reinforced with FRP bars. Also, available design standards either ignore the contribution of or do not recommend the use of GFRP bars in compression members. This study reports the results of experimental investigations of concrete specimens reinforced with GFRP bars and GFRP helices as longitudinal and transverse reinforcement, respectively. A total of five circular concrete columns of 205 mm in diameter and 800 mm in height were cast and tested under axial compression. The experimental results showed that reducing the spacing of the GFRP helices or confining the specimens with CFRP sheet led to improvements in the strength and ductility of the specimens. Also, an analytical model has been developed for the axial loadaxial deformation behaviour of the circular concrete columns reinforced with GFRP bars and helices. The model has been validated with the experimental results.

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“…The stress-strain behaviour of unconfined concrete proposed by Yang et al [37] has been adopted in this study to model the behaviour of unconfined concrete cover. …”

Section: Unconfined Concretementioning

confidence: 99%

Axial load-axial deformation behaviour of circular concrete columns reinforced with GFRP bars and helices

Karim

Sheikh

Hadi

2016

Construction and Building Materials

117

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“…Yang et al (2012) determined the effectiveness factors based on modified versions of the compressive stress-strain relationship generalised by Thorenfeldt et al (1987) and the tensile stress-strain relationship derived by Hordijk (1991). In this study, the model proposed by Yang et al (2014) was used for the compressive stress-strain relationship to cover the extensive range of unit weight (ρ c = 1400-4000 kg/m 3 ) and compressive strength ( f ′ c = 10-100 MPa) of concrete. The fundamental procedures to solve Equations 5 and 6 are specifically explained in the previous study (Yang et al, 2012).…”

Section: Upper-bound Solutionmentioning

confidence: 99%

“…For concrete with f ′ c = 20-100 MPa and ρ c = 1400-4000 kg/m 3 , Equation 5, using the compressive stress-strain relationship proposed by Yang et al (2014), was used and then non-linear multiple regression (NLMR) analysis was carried out in order to propose a simple equation for ν c . Influencing parameters were combined and adjusted repeatedly by trial and error until a relatively high correlation coefficient (R 2 = 0·97) was achieved.…”

Section: Upper-bound Solutionmentioning

confidence: 99%

Shear friction strength of monolithic concrete interfaces

Kwon¹,

Yang²,

Hwang³

et al. 2017

Magazine of Concrete Research

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This paper presents an integrated model for the shear friction strength of monolithic concrete interfaces derived from the upper-bound theorem of concrete plasticity. The model accounts for the effects of applied axial stresses and transverse reinforcement on the shear friction action at interfacial shear cracks. Simple equations are also developed to generalise the effectiveness factor for compression, the ratio of effective tensile to compressive strengths and the angle of concrete friction. The reliability of the proposed model is verified through comparisons with previous empirical equations and 103 push-off test specimens compiled from different sources in the literature.The previous equations considerably underestimate the concrete shear transfer capacity and the underestimation is notable for interfaces subjected to additional axial stresses. The proposed model provides superior accuracy in predicting the shear friction strength, resulting in a mean between experimental and predicted friction strengths of 0·97 and low scatter. Moreover, the proposed model shows consistent trends with the test results in evaluating the effects of various parameters on the shear friction strength.

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“…Yang et al 21 derived a rational approach based on a numerical analysis to calculate the effectiveness factors in compression and tension of concrete using the stress-strain relationships. In this approach, the basic equations generalized by Yang et al 22 and Hordijk 23 were, respectively, modified for compressive and tensile stress-strain relationships of concrete to account for the effect of dry density of concrete on the slopes of ascending and descending branches of the stress-strain curves. The primarily influencing parameters on the compressive and tensile effectiveness factors were found to be dependent on …”

Section: Angle Of Concrete Frictionmentioning

confidence: 99%

Modification Factor for Shear Capacity of Lightweight Concrete Beams

Yang¹,

Ashour²

2015

ACI Structural Journal

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The validity of the modification factor specified in the ACI 318-11 shear provision for concrete members to account for the reduced frictional properties along crack interfaces is examined using a comprehensive database comprising of 1716 normal weight concrete (NWC), 73 all-lightweight concrete (ALWC) and 54 sand-lightweight concrete (SLWC) beam specimens without shear reinforcement. Comparisons of measured and predicted shear capacities of concrete beams in the 2 database show that ACI 318-11 provisions for shear transfer capacity of concrete are more unconservative for lightweight concrete (LWC) beams than in NWC beams. A rational approach based on the upper-bound theorem of concrete plasticity has been developed to assess the reduced aggregate interlock along the crack interfaces and predict the shear transfer capacity of concrete. A simplified model for the modification factor is then proposed as a function of the compressive strength and dry density of concrete and maximum aggregate size on the basis of analytical parametric studies on the ratios of shear transfer capacity of LWC to that of the companion NWC.The proposed modification factor decreases with the decrease in the dry density of concrete, gives closer predictions to experimental results than that in the ACI 318-11 shear provision and, overall, improves the safety of shear capacity of LWC beams.

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Stress-Strain Model for Various Unconfined Concretes in Compression

Cited by 35 publications

References 13 publications

Axial load-axial deformation behaviour of circular concrete columns reinforced with GFRP bars and helices

Axial load-axial deformation behaviour of circular concrete columns reinforced with GFRP bars and helices

Shear friction strength of monolithic concrete interfaces

Modification Factor for Shear Capacity of Lightweight Concrete Beams

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