Effect of high-temperature transient creep on response of reinforced concrete columns in fire

Kodur, Venkatesh; Alogla, Saleh M.

doi:10.1617/s11527-016-0903-8

Cited by 34 publications

(8 citation statements)

References 21 publications

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“…It can be observed that some cement slurry enters into the surface pores of the GHB, forming a tight two-phase mechanical meshing structure at room temperature ( Figure 5 a). Furthermore, the loss of C-S-H gel adsorption water promotes the cement hydration reaction [ 28 ], illustrating the aggregate bond better with the cement matrix after exposure to 200 °C compared to room temperature ( Figure 5 a,b).…”

Section: Resultsmentioning

confidence: 99%

“…The compressive strength decreases significantly within 600–800 °C since a further increase in temperature of GHBC to 600 °C causes the decomposition of calcium hydroxide and causes more moisture to evaporate ( Figure 5 d) [ 28 ]. After exposure to 800 °C, the loss of weight is about 10% and the residual compressive strength is only about 30% compared to its strength at room temperature.…”

Section: Resultsmentioning

confidence: 99%

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Effects of High Temperature on Creep Behaviour of Glazed Hollow Bead Insulation Concrete

2020

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Glazed hollow bead insulation concrete (GHBC) presents a promising application prospect in terms of its light weight and superior fire resistance. However, only a few studies have focused on the creep behaviour of GHBC exposed to high temperatures. Therefore, in this study, the mechanism of high temperature on GHBC is analysed through a series of tests on uniaxial compression and multistage creep of GHBC, exposed from room temperature up to 800 °C. The results show a decrease in the weight and compressive strength of GHBC as the temperature rises. After 800 °C, the loss of weight and strength reach to 9.67% and 69.84%, respectively. The creep strain and creep rate increase, with a higher target temperature and higher stress level, while the transient deformation modulus, the creep failure threshold stress, and creep duration are reduced significantly. Furthermore, the creep of GHBC exhibits a considerable increase above 600 °C and the creep under the same loading ratio at 600 °C increases by 74.19% compared to the creep at room temperature. Indeed, the higher the temperature, the more sensitive the stress is to the creep. Based on our findings, the Burgers model agrees well with the creep test data at the primary creep and steady-state creep stages, providing a useful reference for the fire resistance design calculation of the GHBC structures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of High Temperature on Creep Behaviour of Glazed Hollow Bead Insulation Concrete

2020

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“…The LITS model developed for this proposed stress-strain-temperature relationship could be used to explicitly consider the coupled effects between stress and expansion in modelling the behaviour of concrete structures during the heating phase. It should be noted that much better agreements between the finite element model and experimental data are usually obtained when LITS is explicitly considered in the model [29]. By developing the stress-strain-temperature as discussed in this paper, the strain corresponding to the compressive strength can be explicitly calculated with a clear justification of how the LITS is being incorporated.…”

Section: Discussionmentioning

confidence: 97%

Stress–strain–temperature relationship for concrete

Torero

Dao

2021

Fire Safety Journal

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When concrete structures are subjected to load and temperature simultaneously, it is essential to take into account the coupled effects between stress and expansion. However, due to incomplete understanding, such coupled effects have only been incorporated into current Eurocode 2 (EC2) stress-strain curves by means of empirical correlations. These empirical correlations at different target temperatures are presented in tables that do not allow to clearly identify the correlation chosen to obtain the specific values. A further limitation of these tables is that the relationships cannot be used to evaluate the performance of concrete structures during the cooling phase. In this paper, a physically-based model of the coupled effects between stress and expansion is used to define the strain corresponding to the compressive strength, and thus to develop a simple formulation for stress-strain-temperature relationship of concrete. The results are then compared with the EC2 stress-strain-temperature table. The expression of stress-strain-temperature relationship developed in this paper successfully agrees with the stress-strain curves of concrete in EC2 used for the heating phase. More importantly, the proposed stress-strain-temperature relationship can also be applicable for design purposes of concrete structures during the cooling phase.

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“…Moreover, the further accumulation of creep strain will inversely alter the microstructure of the refractory material. However, many previous researches of the creep were aimed at the material level [16], and few reports are available on the effect of creep deformation on the structural response under cyclical service conditions [17,18]. As for the purging plug made from refractory, the ability to accurately describe its creep behaviour is significant in adjusting the chemical components of its material and optimizing its structural design, which can provide theoretical support for further prolongation of the life span of the purging plug.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of creep effect on purging plug performance under cyclic service

Tan

Jin

et al. 2022

J. Iron Steel Res. Int.

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The service life of the purging plug is one of the fundamental factors that determine the downtime and usage efficiency of the whole ladle. The creep behaviour of the purging plug was thus investigated to identify the possible failure mechanism. At first, the creep parameters of the Norton–Bailey strain hardening rule were inversely identified via the results of the creep test. Then, the thermal-solid coupling model approach was employed to predict the creep behaviour of the purging plug, in which the Norton–Bailey strain hardening rule was applied. The numerical results show that the temperature of the purging plug presents a cyclic trend after the first service period since the preheating temperature is lower than the temperature of molten steel. Furthermore, the distribution of the creep strain intensity in a layered form could also contribute to a gradual spalling of the purging plug end in service. Besides, the creep strain concentration around the slit can be responsible for the clogging of the purging plug.

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Effect of high-temperature transient creep on response of reinforced concrete columns in fire

Cited by 34 publications

References 21 publications

Effects of High Temperature on Creep Behaviour of Glazed Hollow Bead Insulation Concrete

Effects of High Temperature on Creep Behaviour of Glazed Hollow Bead Insulation Concrete

Stress–strain–temperature relationship for concrete

Numerical study of creep effect on purging plug performance under cyclic service

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