Concrete strains under transient thermal conditions: A state-of-the-art review

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

doi:10.1016/j.engstruct.2016.08.021

Cited by 52 publications

(37 citation statements)

References 42 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: 86%

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: 86%

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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“…Further, beam B3 which is subjected to a higher load (stress) level during fire exposure undergoes the most rapid increase in mid‐span deflections because of early yielding of steel reinforcement resulting in greater mechanical and creep strains . In addition, temperature‐induced transient creep in concrete strains that depend on stress level also contribute towards rapid increase in mid‐span deflections …”

Section: Test Resultsmentioning

confidence: 99%

Residual response of fire‐damaged high‐strength concrete beams

Agrawal

Kodur

2019

Fire and Materials

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Summary This paper presents results from an experimental study on residual capacity of fire‐damaged high‐strength concrete (HSC) beams. Four reinforced concrete (RC) beams, fabricated with HSC, were first subject to structural loading and fire exposure with a distinct cooling phase and then loaded to failure upon cooldown to ambient conditions to evaluate residual capacity. Temperatures, deflections, and spalling in the beams were monitored during heating and cooling phases of fire exposure. Further, residual capacity, strains at critical section, and crack patterns (failure mode) of fire‐damaged beams were recorded during residual capacity tests. Results from experiments indicate that the load level during fire exposure, duration of heating phase, rate of cooling, extent (type) of spalling, and duration of postcooling storage influence residual deformations and also residual capacity of RC beams. Further, fire‐damaged HSC beams can recover 40% to 70% of their flexural capacity with respect to their room temperature design capacity provided they survive the entire duration of fire exposure.

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“…Transient and creep strain are combined together and termed as load induced thermal strain (LITS). The main factors that influence transient creep are temperature level, load level and their duration . Under certain combinations of temperature and stress levels, the rate of deformation caused by LITS can be substantial.…”

Section: Properties Of Concrete At Elevated Temperaturesmentioning

confidence: 99%

“…For reliable evaluation of high temperature mechanical properties of concrete, standardized test methods and procedures are required.Another property that influences fire resistance of structures is transient creep. Creep is the additional strain, which results from sustained mechanical loading on concrete, and gets amplified at ele-Test standards for evaluation of thermal properties of concrete load level and their duration [9][10][11]. Under certain combinations of temperature and stress levels, the rate of deformation caused by LITS can be substantial.…”

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confidence: 99%

Test methods for characterizing concrete properties at elevated temperature

2019

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Summary Fire resistance of structural members is dependent on the thermal and mechanical properties of constituent materials and these properties vary as a function of temperature. Currently, there are limited standardized test procedures for evaluating thermal and mechanical properties of construction materials at elevated temperatures. This paper provides a review and assessment of test methods and procedures for evaluating high temperature thermal and mechanical properties of concrete. The drawbacks and variations in currently available test procedures and methods in standards are discussed. Recommendations on the most suitable methods and procedures for measuring thermal and mechanical properties at elevated temperature is presented. In addition, applicability of the proposed high temperature test methods and procedures is illustrated through a case study on conventional concrete specimens. Further, the need for developing standards by organizations such as American Society for Testing and Materials (ASTM), with standardized specifications and test procedures for measuring high temperature properties of construction materials, is laid out.

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Concrete strains under transient thermal conditions: A state-of-the-art review

Cited by 52 publications

References 42 publications

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

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

Residual response of fire‐damaged high‐strength concrete beams

Test methods for characterizing concrete properties at elevated temperature

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