Bond Model for Prestressed Strands in Fire Exposed Concrete

Fellinger, J.; Stark, J.W.B.; Walraven, J.C.

doi:10.1061/40691(2003)3

Cited by 6 publications

(15 citation statements)

References 0 publications

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“…Strand temperature is not a useful indicator because the greater the axis distance of the strands, the greater the negative impact on shear and anchoring behavior. Thirdly, shear and anchoring failures are low and significant with slimmer slabs [8]. Figure 14 clarifies the vertical cracks that occurred over the whole length of the specimen due to incompatible thermal elongations.…”

Section: Failure Mechanismsmentioning

confidence: 79%

“…Over the previous four decades, more than one hundred HCS units were experimentally evaluated when subjected to typical fire circumstances [2-16, 19,53]. The fire was by using ISO 834 [3][4][5][6][7][8][9][10][11][12][13][14][15]25] fire or ASTM119 [2,19]. The bulk of these experiments were intended mainly to measure the fire resistance (FR) of separate HCS units instead of the structural attitude of the HCS system under temperature.…”

Section: Experimental Studies On Hcsmentioning

confidence: 99%

“…Multiple studies have been carried out concerning the effects of support conditions (restrained and unrestrained) on HSC behaviour against fire [3,6,8,11,12,13]. The fundamental rule is, without a doubt, thermal expansion.…”

Section: Support Conditionmentioning

confidence: 99%

“…[23] Figure 13: Possible failure mechanisms for HCS [23] During fire tests, more than one type of failure mode may occur, or one after another may be observed. The behavior of HCS until failure and the type of failure is significantly controlled by longitudinal restriction [8,11,53], Support details [8], slab thickness [8,19,53], loading pattern [19] or level [9,53]. HCS can fail through a shear limit condition before failing flexural in some conditions [19].…”

Section: Failure Mechanismsmentioning

confidence: 99%

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Prestressed hollow-core slabs performance at high temperatures- A review

Aziz¹

2023

MSA Engineering Journal

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Pre-stressed concrete hollow core slabs (HCS) are now progressively used in commercial, industrial, and residential buildings due to their sustainability, affordability, and adaptability. The performance of HCS units subjected to fire is particularly difficult and is attributable to their unusual cross-section, which features voids. Numerous investigations were executed on HCS at high temperatures concerning the crucial temperature and failure mechanisms of both concrete and prestressing steel. Fire performance is influenced by a number of variables, including support condition, concrete aggregate type, slab thickness, fire insulation and cover thickness for reinforcement, spalling accessibility, void cores and size, and firing methodology. While a number of these variables have received extensive research, some have been noted as potential contributory reasons for failure, while others have received relatively little attention. This paper summarises numerous experimental, numerical, and analytical studies about the attitude of HCS vulnerable to fire in addition the building standards limitations to provide a valuable reference for future researchers.

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Section: Failure Mechanismsmentioning

confidence: 79%

Section: Experimental Studies On Hcsmentioning

confidence: 99%

Section: Support Conditionmentioning

confidence: 99%

Section: Failure Mechanismsmentioning

confidence: 99%

See 2 more Smart Citations

Prestressed hollow-core slabs performance at high temperatures- A review

Aziz¹

2023

MSA Engineering Journal

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“…The grip is also influenced by many technological factors. In the case of ribbed bars, a very notable factor influencing the grip are mechanical interlocks, with strength the greater the asperity of the bar's surface [3,4]. Adhesion is also impacted by the shape of aggregate used in the concrete.…”

Section: Prefacementioning

confidence: 99%

Structural steel bond to concrete with waste aggregate

Ogrodnik

Szulej

2018

SHS Web Conf.

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The article presents the results of bond tests of B500SP structural steel to concretes subjected to thermal stress. Concretes were designed purely on the basis on waste aggregate made of soft clay pottery with using two types of cements: Portland CEM 32.5R and aluminous cement Górkal 70. In the research was used the method of direct pulling the steel rod out of the concrete cover (Pullout Test). For the tests were prepared four types of concretes: two bases of aluminous cement and two on Portland cement without additions. In the remaining mixtures containing the additive in the form of clinoptilolite, the method of simple weight replacement of the selected type of cement with clinoptilolite in the amount of 10% was used. Mineral puzzolana additives are intended to modify the phase composition of hardened cement slurry towards reducing the portlandite and changing the CaO/SiO2 ratio in the C-S-H phase. The results of the tests confirmed that the bond of the selected steel type to concrete on the recycle aggregate does not differ from the results achieved with natural aggregate. It was also confirmed that addition of clinoptilolite to concrete with Portland cement has beneficial effect when it is subjected to thermal stress.

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Capacity and failure modes of restrained hollow core slabs taking into account compressive membrane action

Thienpont

Coile

Corte

et al. 2023

Structural Concrete

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The formation of compressive membrane action in restrained precast concrete hollow core slabs is investigated, and how it affects the load bearing capacity and failure mode under excessive loading. To this end, attention is oriented to a recently completed experimental campaign specifically aimed at quantifying this phenomenon in real‐scale hollow core slabs. The outcomes of this experimental campaign are then analyzed using a validated finite element model, to further study the effects of compressive membrane action on the structural behavior of hollow core slabs. From the numerical evaluations, it can be concluded that the ultimate capacity and failure mode of restrained hollow core slabs strongly depend on the restraint conditions, as well as the span‐to‐depth ratio. The results also indicate that in some cases the failure is caused by crushing of concrete in the top flange, which is typically not observed in case of simply supported boundary conditions. Additionally, the influence of the inherent uncertainties associated with material properties and geometry on the ultimate capacity and failure mode of restrained hollow core slabs is investigated. Probabilistic model evaluations are performed for a wide range of boundary conditions. The results indicate a very high influence of the uncertainty on the concrete tensile strength on the membrane action in precast hollow core slabs.

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Bond Model for Prestressed Strands in Fire Exposed Concrete

Cited by 6 publications

References 0 publications

Prestressed hollow-core slabs performance at high temperatures- A review

Prestressed hollow-core slabs performance at high temperatures- A review

Structural steel bond to concrete with waste aggregate

Capacity and failure modes of restrained hollow core slabs taking into account compressive membrane action

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