Response of precast prestressed concrete hollowcore slabs under fire conditions

Shakya, Anuj M.; Kodur, Venkatesh

doi:10.1016/j.engstruct.2015.01.018

Cited by 47 publications

(80 citation statements)

References 7 publications

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“…On the contrary a mixture containing only calcareous aggregates shows a smaller loss of stiffness and lower deflection. These conclusions agree with results from Shakya and Kodur [15].…”

supporting

confidence: 93%

“…This last option, a sequentially coupled approach, was chosen due to its computational competitiveness. In addition, it is worth remarking that most of authors have also chosen this analysis procedure, [14], [15].…”

Section: Analysis Proceduresmentioning

confidence: 99%

“…A thermo-mechanical model using the finite element method also was proposed by Shakya and Kodur [15] in order to study the effect of critical parameters such as fire scenario, load level, restrain conditions and aggregate type on the behavior of HC slabs under fire conditions.…”

mentioning

confidence: 99%

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A 3D finite element model for predicting the fire behavior of hollow-core slabs

Aguado

Albero

Espinós

et al. 2016

Engineering Structures

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A nonlinear finite element three-dimensional model is presented and validated in this work against standard fire tests. The aim is to develop a numerical tool in order to study the behavior of prestressed Hollow Core (HC) slabs in the event of fire. A sequentially coupled approach is considered in order to perform the thermo-mechanical analysis at an affordable computational cost. The model includes the effect of prestress and a realistic constitutive inelastic behavior of concrete, for both tension and compression. It takes into account the temperature dependency of the material properties, and thus the crack patterns due to bending, shear, thermal cracking and longitudinal cracking are reproduced. The model is validated by comparing the simulation results with 11 real fire resistance tests on single elements, obtaining satisfactory results in terms of both failure mechanism and failure time. Finally, the suitability of using the simple calculation models existing in the European codes (Eurocode 2, EN 1168) for the verification of the HC resistance in fire situation is discussed. In particular, the numerical results are compared to the simple calculation model given in the EN 1168.

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“…On the contrary a mixture containing only calcareous aggregates shows a smaller loss of stiffness and lower deflection. These conclusions agree with results from Shakya and Kodur [15].…”

supporting

confidence: 93%

Section: Analysis Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

A 3D finite element model for predicting the fire behavior of hollow-core slabs

Aguado

Albero

Espinós

et al. 2016

Engineering Structures

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“…In other words, these deflections are mainly due to thermal strains generated as a result of high thermal gradients within the cross section of the slabs. As expected, the deflection trend of the two‐way hollow slabs are different from the nonlinear deflection (three‐stage mode) observed in one‐way PC hollow slabs . On the other hand, the linear trend is different from those observed in the conventional solid slabs.…”

Section: Resultssupporting

confidence: 53%

“…Failure of the slabs is to be evaluated based on different failure criteria discussed in the references, including integrity, insulation, strength, and deflection (ratio) limit state.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation on the fire resistance of cast‐in‐situ hollow core concrete slabs constructed using filler boxes and an assembly box system

Lyu

Yong

Coile

et al. 2018

Structural Concrete

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This paper presents the results of four fire tests on full-scale cast-in-situ, hollow core concrete slabs, constructed using filler boxes and an assembly box system. Experimental data include the furnace temperature, temperature distribution in the slab, and vertical and horizontal deflections during the heating and cooling phases, as well as observed cracking patterns. The test data indicate that the tested hollow slabs with plastic filler boxes have good performance in case of standard fire exposure with small vertical deflections and high deflection recovery in long duration testing. For slabs with assembly box systems serious spalling was observed, resulting in integrity failure after 69 minutes in one of the tests. Nevertheless, load bearing capacity was maintained for all tests. The tests highlight the importance of the boundary conditions and the arrangement of the filler system on the fire behavior of the hollow slabs, particularly with respect to the observed cracking, spalling, and structural integrity.

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Effect of micro‐structural changes on concrete properties at elevated temperature: Current knowledge and outlook

Pulkit

Adhikary

2021

Structural Concrete

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The influence of microstructural changes on concrete properties at elevated temperatures is presented and discussed in this paper, as the exposure to elevated temperatures brings in marked changes in concrete thermal, mechanical and kinematic properties owing to the heat-induced evolution of material's microstructure. The major microstructural changes consist in increasing pore size, occurrence of microcracking and activation of chemo-physical processes in the hardened cement-paste. These processes (like portlandite dissociation and crystalline change in quartzitic aggregate) occur above 400 C and are more pronounced in high-strength than in normal-strength concrete. Increasing pore size and microcracking, however, yield the largest contribution to concrete strength-loss, that occurs mainly between 400 and 800 C, depending on aggregate type and initial moisture content in the mix. On the whole, calcareous (or carbonate) aggregate behaves better than siliceous aggregate face to increasing temperatures. Initial moisture content favors concrete thermal spalling, mostly between 200 and 400 C, but such a complex phenomenon is still open to investigation, as demonstrated by the various theories found in the literature, each with its chemo-physical mechanisms and limitations.Three theories are discussed in this paper, and these theories together with other critical issues allow to focus on future work.concrete, concrete kinematic properties (at elevated temperatures), concrete mechanical and physical properties, elevated temperatures, microstructure (of concrete)

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Response of precast prestressed concrete hollowcore slabs under fire conditions

Cited by 47 publications

References 7 publications

A 3D finite element model for predicting the fire behavior of hollow-core slabs

A 3D finite element model for predicting the fire behavior of hollow-core slabs

Experimental investigation on the fire resistance of cast‐in‐situ hollow core concrete slabs constructed using filler boxes and an assembly box system

Effect of micro‐structural changes on concrete properties at elevated temperature: Current knowledge and outlook

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