Behavior of Concrete under Biaxial Stresses

Kupfer, H.; Gerstle, Kurt H.

doi:10.1061/jmcea3.0001789

Cited by 451 publications

(200 citation statements)

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“…To associate the initiation of the shear failure to the propagation of the second branch of the critical crack results in a significant simplification of the problem, since it allows formulating a failure criterion expressed in terms of concrete stresses in the compression chord (Kupfer's biaxial failure envelope [20]), (Fig. 3).…”

Section: Second Branchmentioning

confidence: 99%

“…The model incorporates the contributions to shear strength provided by the un-cracked compressed concrete chord (Vc), by the diagonally cracked web (Vcw), including the residual stresses transferred along the crack's length by fracture energy of concrete, by the stirrups crossing the critical shear crack (Vs), if they are present and, in that case, by the longitudinal reinforcement (Vl). After the development of the first branch of the critical shear crack, failure is considered to occur when the stresses at any point of the concrete compression chord reach the assumed biaxial stress failure envelope, as proposed by Kupfer [20].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical model for the shear strength of steel fiber reinforced concrete (SFRC) beams without stirrups

et al. 2020

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Numerous studies have shown that adding steel fibers to the concrete mixture improves both the shear strength and ductility of reinforced concrete beams. Most current shear design formulations for steel fiber reinforced concrete beams are empirically based and their predictions provide acceptable results when compared with tests results, but only in limited ranges of the parameters involved. On the other hand, many shear theoretical models suggested in the literature are derived by extending previous formulations for conventional reinforced concrete beams, just introducing the stresses transferred across the critical shear crack. Since the effects of steel fibers on the others shear resisting mechanisms are not accounted for, "adjusting" empirical factors must be used to fit the experimental results. There is, therefore, the need for developing mechanical models capable to rationally account for the effects of steel fibers on the global shear strength and on each shear resisting mechanisms.In this paper, the previously derived and validated Multi Action Shear Model for RC elements is extended to steel fibers reinforced concrete beams without stirrups. The effects of steel fibers on each resisting mechanism have been identified and incorporated in the formulation of each shear component and in the Multi-Action Shear Model equilibrium equations. The residual tensile stresses of fibrous 2 concrete, obtained through a simple formulation, has been used to: capture the enhancement of the compression chord contribution; the shear transferred by bridging effect of the fibres along the critical shear crack and by dowel action.The proposed model is shown to properly estimate the shear resistance of a large set of available test data, being able to account for most influencing parameters, like fibers types and amounts, concrete strength, longitudinal reinforcement ratios and beams geometry.

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Section: Second Branchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical model for the shear strength of steel fiber reinforced concrete (SFRC) beams without stirrups

et al. 2020

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“…the analysis of stresses can provide a good prediction of joint strength; a general criterion suitable for different axial load ratios and concrete strength should be defined; . limitations of the principal tensile stress give too conservative predictions of first cracking of the joint; the Kupfer and Gerstle [11] approach provides the most accurate model for prediction of a biaxial phenomenon.…”

Section: Discussionmentioning

confidence: 99%

“…In order to find a more reliable criterion for first cracking of the joint, the approach proposed by Kupfer and Gerstle [11] was followed. They studied the behavior of concrete under biaxial states of stress and summarized the results of their analysis by providing interaction curves.…”

Section: Experimental Theoreticalmentioning

confidence: 99%

Capacity Assessment of RC Subassemblages Upgraded with CFRP

Prota

Nanni

Manfredi

et al. 2003

Journal of Reinforced Plastics and Composites

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Many gravity load designed (GLD) reinforced concrete (RC) structures located in seismic areas are in need of upgrade. As an alternative to traditional upgrade solutions, an innovative technique based on the use of Fiber Reinforced Polymer (FRP) composites was proposed and experimentally validated. The technique consists of strengthening reinforced concrete connections by means of the combined use of FRP laminates and FRP near surface mounted (NSM) bars. In parallel, a theoretical approach for the assessment of the connection capacity was developed based on the analysis of each component (i.e., column, beam and joint), in order to determine which component controls failure. The outcomes of the analysis were compared to the experimental results with considerations on the reliability of the approach and aspects slated for future investigations. The behavior of the FRP-confined column cross section was also analyzed and it is herein discussed based on recorded strains in internal steel bars and FRP jacket.

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“…The lower bound ultimate shear capacity of the composite wall was conservatively proposed by the summation of individual shear resistance of the sheets (two times of Eq. 2.6) and shear resistance of concrete panel as per Kupfer and Gerstle (1973) model:…”

Section: Double Skin Profiled Composite Shear Wallmentioning

confidence: 99%

Behaviour of composite framed shear wall system

Akram¹

2021

Preprint

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This research investigated the behaviour of a novel form of composite framed shear wall system (CFSWS) under lateral loading. The CFSWS consisted of a composite wall (made of two skins of profiled steel sheeting and an infill of concrete) connected to pinned steel or fixed concrete filled steel tube (CFST) frame. The experimental investigations on one and two-storey four CFSWS models of 1/6th scale provided information on shear load-deformation response, shear strength/stiffness, energy absorbing capacity, stress-strain characteristics and failure modes. The failure of CFSWS was associated with buckling of steel sheets and development of diagonal concrete core cracking as well as the wall-frame fastener and CFST frame joint failure. Overall, the failure was governed by wall failure rather than frame. Analytical models for the shear strength of CFSWS were developed and found to be in close agreement with experiments. This research confirmed the viability of using novel CFSWS in practical construction.

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Behavior of Concrete under Biaxial Stresses

Cited by 451 publications

References 0 publications

Mechanical model for the shear strength of steel fiber reinforced concrete (SFRC) beams without stirrups

Mechanical model for the shear strength of steel fiber reinforced concrete (SFRC) beams without stirrups

Capacity Assessment of RC Subassemblages Upgraded with CFRP

Behaviour of composite framed shear wall system

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