Experimental Study to Determine the Tension Softening Curve of Concrete

Niwa, Junichiro; Matsuo, Tetsuji; Sumranwanich, Taweechai

doi:10.2208/jscej.1998.606_75

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…To get the tension-softening diagram after the peak interfacial stress, Niwa et al (1998) proposed a modified J-integral method, which can consider crack propagation and remove the elastic displacement of the beam due to crack initiation. Using this method, Dai et al (2003) and Zhang et al 2013derived the tension-softening diagrams for FRP-concrete and polymer cement mortar-concrete interfaces, respectively.…”

Section: Tension-softening Constitutive Law Of Rock-concrete Interfacementioning

confidence: 99%

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Fracture Mechanisms of Rock-Concrete Interface: Experimental and Numerical

Dong

Zhou

2016

J. Eng. Mech.

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Uniaxial tension and three-point bending tests are conducted on rock-concrete composite specimens with artificial grooving or natural interfaces to investigate the interface mechanics and fracture properties to establish an interface tension-softening constitutive law between concrete and rock for analyzing fracture failure of rock-concrete structures. Tensile strength, fracture energy and initial fracture toughness of a rock-concrete interface are obtained from experiment. Based on the load-displacement curves measured in the three-point bending test, the energy dissipation at a rock-concrete interface is derived using the modified J-integral method. Further, through enforcing a balance between energy dissipation and energy generated by fictitious cohesive forces acting on the fracture process zone, the tension-softening constitutive law of a rock-concrete interface is established, which takes into account the effects of fracture energy and tensile strength of an interface. For the sake of practical applications, the tension-softening constitutive expression is simplified as a bilinear function. Finally, the crack propagation process of a series of concrete-rock composite beams is simulated numerically based on a nonlinear fracture mechanics theory by introducing a crack propagation criterion. The predicted load vs. crack mouth opening displacement (P-CMOD) curves show a reasonable agreement with the experimental ones, verifying the tension-softening constitutive law for a rock-concrete interface derived in this study.

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Section: Tension-softening Constitutive Law Of Rock-concrete Interfacementioning

confidence: 99%

“…If the energy E(δ) is used to drive crack propagation, the tension-softening relationship can be derived as Equation (12) (Niwa et al 1998):…”

Section: Tension-softening Constitutive Law Of Rock-concrete Interfacementioning

confidence: 99%

Fracture Mechanisms of Rock-Concrete Interface: Experimental and Numerical

Dong

Zhou

2016

J. Eng. Mech.

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“…To get the tension-softening diagram after the interfacial peak stress, Niwa et al [6] proposed a modified J integral method, which can consider crack propagation and remove the elastic displacement of the beam due to the crack initiation. The J-integral is defined as the energy available for crack propagation E(δ), which can be interpreted as the total absorbed energy of the cracked specimens minus released elastic energy during unload process.…”

Section: Tension Softening Constitutive Of Rockconcrete Interfacementioning

confidence: 99%

Investigation on Fracture Mechanisms and Crack Propagation Process of Natural Rock-Concrete Interface

Dong

Wang

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract:The tests of uniaxial tension and three-point bending are carried out on rock-concrete composite specimens with natural interfaces to investigate the interface mechanics and fracture process so that to establish interface tension-softening constitutive law between concrete and rock. Tensile strength, fracture energy and initial fracture toughness of rock-concrete interface are investigated qualitatively. Based on the load-displacement curves measured in three-point bending test, the energy dissipation at rock-concrete interface is derived using the modified J-integral method. Further, through enforcing balance between energy dissipation and energy caused by fictitious cohesive force acting on fracture process zone, the tension-softening constitutive law of rock-concrete interface is established, which takes into account the effects of fracture energy and tensile strength of interface. For the sake of practical applications, the tension-softening constitutive expression is simplified as a bilinear function. Finally, the crack propagation process of the concrete-rock composite beam is simulated numerically based on nonlinear fracture mechanics theory by introducing a crack propagation criterion. The predicted P-CMOD curves show a reasonable agreement with the experimental ones, which verifies the tension-softening constitutive law for rock-concrete interface derived in this study.

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“…However, there is an inherent problem in this test; it is difficult to maintain a stable condition of loading on the specimen during the softening process. Therefore, by using the energy balance concept that was proposed to determine the post-peak tension-softening relation of concrete [35][36][37][38][39][40][41][42], the softening relation for the cement-treated sand was estimated from the bending test results. Three points bending tests were conducted by using a beam specimen with a central notch shown in Figure 14 [25].…”

Section: Pc-3mentioning

confidence: 99%

“…The P-d c0 relations are stable even after the ELASTO-PLASTIC MODEL FOR CEMENT-TREATED SAND 81 peak loads, thereby indicating the existence of a strain-softening relation of the cement-treated sand similar to concrete. By using the method proposed by Uchida et al [39,40], the softening relations for the cement-treated sand were estimated from the P-d c0 curves. The calculated tension-softening relations are shown in Figure 16.…”

Section: Pc-3mentioning

confidence: 99%

Elasto‐plastic model for cement‐treated sand

Namikawa

Mihira²

2006

Num Anal Meth Geomechanics

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SUMMARYThis paper presents an elasto-plastic model for non-linear analyses of cement-treated sand. Various laboratory tests were systematically carried out to investigate the pre-peak and post-peak behaviours of a cement-treated sand. On the basis of these experimental results, the new model was built within the framework of a relatively simple elasto-plastic theory.Two failure criteria are employed to express tensile and shear failure characteristics observed in the experimental results of the cement-treated sand. The proposed model can describe strain-hardening and strain-softening responses under both failure modes. In the strain-softening rules, the smeared crack concept is used, and a characteristic length is considered to avoid the issue of mesh-size dependency. Since the failure criterion and strain-hardening/softening rules are based on the experimental evidences, the model is relatively easy to understand and the parameters used in the model have clear physical meaning. The proposed model was applied to simulate the behaviour of cement-treated sand in various laboratory tests, allowing for a reasonable comprehensive evaluation. It was demonstrated that the proposed model is suitable for describing both the tensile and shear failure behaviours of cement-treated sand.

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Experimental Study to Determine the Tension Softening Curve of Concrete

Cited by 11 publications

References 3 publications

Fracture Mechanisms of Rock-Concrete Interface: Experimental and Numerical

Fracture Mechanisms of Rock-Concrete Interface: Experimental and Numerical

Investigation on Fracture Mechanisms and Crack Propagation Process of Natural Rock-Concrete Interface

Elasto‐plastic model for cement‐treated sand

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