A multiaxial load-induced thermal strain constitutive model for concrete

Torelli, Giacomo; Gillie, Martin; Mandal, Parthasarathi; Tran, Van-Xuan

doi:10.1016/j.ijsolstr.2016.11.017

Cited by 13 publications

(18 citation statements)

References 30 publications

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“…An analysis of these results shows that the experimentally measured LITS state under multiaxial conditions exceeds that predicted by merely superimposing uniaxial LITS states [19]. This has been explained by postulating the confinement-dependency of the two main driving mechanism of LITS, namely micro cracking and micro diffusion [17].…”

Section: Confinement-dependent 3d Implementation Methodsmentioning

confidence: 89%

“…For this reason, the approach of taking the stress confinement into account presented by the authors in [17] has been adopted in this work. The method consists of including the dependency of LITS on the confinement of stress state in (2-1) by introducing a confinement coefficient :…”

Section: Confinement-dependent 3d Implementation Methodsmentioning

confidence: 99%

“…This work showed that accounting for the effects of stress confinement was important for accurately calculating stress-states in bulk concrete structures such as PCPVs used in nuclear power stations. In the present paper, the 3D extension method proposed by the authors in [17] is adopted for formulating a LITS model able to capture the behaviour of multiaxially confined concrete subjected to transient temperatures up to 500°C, temperatures representative of nuclear PCPVs subjected to complete fault of their water cooling system. The approach is validated and discussed in the light of the experimental studies by Kordina et al [16].…”

Section: The Model Was Validated For Temperatures Up To 250°c Tempermentioning

confidence: 99%

“…(2-2), (2-3) and (2-4) was previously employed by the authors to implement a 3D LITS function that varied bi-linearly with temperature aimed at capturing the development of LITS for temperatures up to 250°C [17]. The bilinear LITS curve was obtained by defining a constant LITS derivative function ( ) and by ensuring that LITS did not develop for temperatures lower than a user-defined critical temperature, .…”

Section: Uniaxial Lits Function For Temperatures Up To 500°cmentioning

confidence: 99%

“…For this reason, a novel approach for modelling LITS as a stress-confinement strain component has been presented by the authors in [17].…”

Section: Introductionmentioning

confidence: 99%

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A confinement-dependent load-induced thermal strain constitutive model for concrete subjected to temperatures up to 500 °C

Torelli

Mandal

Gillie

et al. 2018

International Journal of Mechanical Sciences

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T 1 Highlights  LITS development for temperatures up to 500°C is strongly confinement-dependent  A confinement-dependent LITS model for this temperature range is presented  The model is numerically implemented, validated applied to a test case  The behaviour of nuclear vessels is affected by the confinement-dependency of LITS ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T AbstractThis paper proves that, given a Load-Induced Thermal Strain (LITS) curve able to accurately describe the uniaxial LITS development for a specific type of concrete and temperatures up to 500°C, a more accurate prediction of the 3D LITS state is obtained through a confinement-dependent 3D implementation than through the classic confinement-independent approach. In particular, a new model is presented, obtained by extending to 3D a fourth order polynomial LITS derivative function in a way that allows the effects of the stress confinement to be taken into account. For comparison purposes, the same fourth order polynomial LITS derivative function is also implemented in 3D through the classic confinement-independent modelling approach. These constitutive relationships are adopted to model transient experiments performed on concrete subjected to constant uniaxial and biaxial compressive loads. The results show that the confinementdependent modelling approach gives a better prediction of the LITS state developing in the case of biaxial compression than the classic confinement-independent approach. Finally, the validated confinementdependent model is applied to evaluate the LITS-related stress redistribution taking place in a typicalPrestressed Concrete Pressure Vessel (PCPV) subjected to heating to 500°C and cooling back to the normal operating temperature of 50°C. It is found that including the effects of three dimensional LITS behaviour has significant effects on the predicted stress states.

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Section: Confinement-dependent 3d Implementation Methodsmentioning

confidence: 89%

Section: Confinement-dependent 3d Implementation Methodsmentioning

confidence: 99%

Section: The Model Was Validated For Temperatures Up To 250°c Tempermentioning

confidence: 99%

Section: Uniaxial Lits Function For Temperatures Up To 500°cmentioning

confidence: 99%

“…For this reason, a novel approach for modelling LITS as a stress-confinement strain component has been presented by the authors in [17].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A confinement-dependent load-induced thermal strain constitutive model for concrete subjected to temperatures up to 500 °C

Torelli

Mandal

Gillie

et al. 2018

International Journal of Mechanical Sciences

Self Cite

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A length scale insensitive phase‐field model for fully coupled thermo‐mechanical fracture in concrete at high temperatures

Chen

Zhou

2022

Num Anal Meth Geomechanics

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Fracture in concrete at high temperatures involves complex thermo‐mechanical couplings and arbitrary crack evolution, imposing great challenges to its computational modeling. This work addresses a length scale insensitive phase‐field cohesive model for fully coupled thermo‐mechanical fracture in concrete at high temperatures. Both the thermal expansion and transient creep strain are accounted for in the kinematics. Based on the underlying phase‐field cohesive model for fracture in solids at ambient temperature, the temperature‐dependent mechanical properties of concrete, that is, Young's modulus, tensile and compressive strengths and fracture energy, and so forth, are all incorporated. In addition to the cracking‐induced mechanical damage mechanism represented by the crack phase‐field, the thermal deterioration mechanism is also considered by a temperature‐dependent thermal damage variable. The numerical implementation of the proposed model into the multi‐field finite element method is then briefly addressed. Several representative numerical examples, for example, thermally induced cracking in energy storage structures, thermal shock in quenched concrete plates, mode‐I and mixed‐mode failure of notched beams at high temperatures, and so forth, are presented for the validation. The effects of various expressions for the transient creep strain (TCS) on the global behavior of concrete structures are also studied. As in those purely mechanical problems, both the predicted crack pattern and global responses for all examples are insensitive to the incorporated phase‐field length scale. Being able to capture the fully coupled thermo‐mechanical fracture in concrete, the proposed phase‐field cohesive model, combined with a reliable hydro‐chemo‐thermal analysis, is promising in assessing the integrity and safety of concrete structures at high temperatures like fire scenarios.

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