Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature

Albero, Vicente; Espinós, Ana; Serra, E.; Romero, Manuel L.; Hospitaler, Antonio

doi:10.1016/j.engstruct.2018.11.061

Cited by 30 publications

(33 citation statements)

References 12 publications

(23 reference statements)

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“…Previous parametric studies carried out by the authors [8,9] with a validated finite element model showed the improvement in terms of fire resistance which may be achieved with the SFB solution, as compared to an equivalent IFB configuration with the same load bearing capacity at room temperature or in terms of equal steel area. This numerical investigation confirmed that a good strategy for enhancing the fire resistance of composite beams embedded in floors is to split the lower steel flange into two steel plates.…”

Section: Code Provisions and Available Fire Design Methodsmentioning

confidence: 95%

“…Additionally, the most sophisticated way to evaluate the thermo-mechanical behaviour of slim-floor beams is by means of finite element (FE) models. In recent investigations, some authors [16], [8] have developed detailed FE models, using the commercial package ABAQUS, where a sequentially coupled thermal-stress analysis is performed ( Fig. 4).…”

Section: Advanced Modelsmentioning

confidence: 99%

“…Through this type of model, other three-dimensional phenomena can be assessed, apart from the simple cross-section evaluation, such as the concrete cracking or the development of the composite effect between steel and concrete, as well as possibility of applying non-uniform heating conditions or taking into account the effect of the voids in the floor system in a more realistic way. Now all the available models have been described, it is considered useful at this point to compare the validated FE model developed by authors [8] against the simplified temperature formulas developed by Zaharia and Frans-…”

Section: Advanced Modelsmentioning

confidence: 99%

“…Evolution of the SFB load ratio for different standard fire exposure times SFB-Ausnutzungsgrad in Abhängigkeit von der Feuerwiderstandsdauer Fig. 11 Comparison of the fire performance between SFB and IFB configurations: a) Temperature difference [9]; b) Fire resistance difference [8] Vergleich von SFB-und IFB-Querschnitten: a) Temperatur [9]; b) Ausnutzungsgrad [8] the local bending moment of the bottom plate, which works as a cantilever in the transverse direction, should be checked. Specific reinforcing tie bars should be provided in the concrete encasement so as to work in the transverse direction.…”

Section: Fig 10mentioning

confidence: 99%

“…Numerical model of SFB cross-section discretized in cells Numerische Diskretisierung eines SFB-Querschnitts model for slim-floor beams[8] FE-Modell eines Slim-Floor-Trägers[8] …”

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Fire design of slim‐floor beams

et al. 2019

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Slim‐floor beams are a well‐known and cost‐effective solution that permits a significant reduction of floor thickness, and are increasingly used in industrial and commercial buildings. Since only their lower flange is exposed to fire, slim‐floor beams may also achieve higher fire resistance, in comparison to other types of composite beams that are not fully embedded in the concrete floor. Simplified models are available in Eurocode 4 Parts 1‐2 to evaluate the temperature distribution for partially encased and non‐encased composite beams. However this standard does not provide any simplified model to evaluate the cross‐sectional temperature field of slim‐floor beams. In this sense, different proposals have been evaluated in recent years in order to provide simplified models for temperature evaluation. The currently available models in the literature have shown their accurate behaviour providing results on the safe side, and are recommended for use in practice. Finally, this work shows that slim‐floor composite beams can provide good performance during a fire event. Specifically, 60 min of standard fire rating can be achieved for load levels lower than 0.5–0.6. Improved behaviour to achieve 90 or 120 min of standard fire exposure may also be reached by using innovative solutions, advanced materials or external protection.

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Section: Code Provisions and Available Fire Design Methodsmentioning

confidence: 95%

Section: Advanced Modelsmentioning

confidence: 99%

Section: Advanced Modelsmentioning

confidence: 99%

Section: Fig 10mentioning

confidence: 99%

“…Numerical model of SFB cross-section discretized in cells Numerische Diskretisierung eines SFB-Querschnitts model for slim-floor beams[8] FE-Modell eines Slim-Floor-Trägers[8] …”

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Fire design of slim‐floor beams

et al. 2019

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Shallow composite floor beams – Proposal of a simplified analytical method for standard fire rating

Zanon¹,

Yıldız²,

Obiala³

et al. 2021

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Shallow composite floor beams are a widely accepted solution for office, residential and other types of buildings. In most of their applications a standard fire resistance between R30 to R120 is required. Several fire tests were carried out in different laboratories over the last decades with various structural configurations, showing that this structural solution exhibits an integrated fire resistance without additional fire protection. In the frame of various programs, extensive research has been done on the fire behavior, completed by numerical simulations. Several scientists have proposed analytical methods to assess the resistance. Nevertheless, the Eurocode does not contain a method for assessing the standard fire resistance of composite shallow floor beams. This paper presents a simplified analytical method to determine the sagging moment resistance of Slim Floor Beams (SFB – being composed by a rolled section (or equivalent) with a wider plate welded below the bottom flange) under standard fire exposure. First, an FE model has been developed and validated on experimental tests. Afterwards, a parametric study covering various geometrical configurations and material choices has been performed. An analytical model for determining the sagging moment resistance is proposed and validated by comparison with results obtained by numerical simulation.

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A Novel Strategy for Slim‐floor Fire Protection

et al. 2023

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This paper presents a novel slim‐floor configuration which consist of an I‐section steel profile welded to a wider bottom steel plate with an insulation layer of 5mm thick placed in between the two. The insulation layer is made up of a flexible and non‐combustible material, which protects the I‐section profile from the temperature rise through its bottom surface. Besides, this insulation layer remains protected from external agents with no need of maintenance because it is placed in the cavity created on purpose between the bottom plate and the lower flange of the steel profile thank to the weld between them. This new slim‐floor configuration is currently right‐protected by the Spanish Office of Patents and Trademarks with the reference number P201930438 and has been tested in the Universitat Politècnica de Valencia testing facilities to assess its thermal behaviour in fire. Specifically, the specimen was tested using an electric furnace where the slim‐floor is placed at the top surface. Therefore, the composite beam is exposed to the heat source only from the bottom surface, as it is the case in real fire scenarios. Moreover, the experimental campaign includes also a common slim‐floor specimen, without the insulation layer, in order to compare their thermal behaviour. The steel parts used in all the test specimens were grade S355, having a nominal yield strength of 355 MPa, the nominal compressive strength (cylindrical) of the cast in‐situ concrete was 30 MPa and the precast concrete hollow core slabs were manufactured with 45 MPa nominal compressive strength (cylindrical). In turn, the embedded reinforcing bars were grade S500, with 500 MPa nominal yield strength. The first experimental results have shown that the temperature gap between the bottom steel plate and the lower flange of the steel profile can reach up to 200°C. This impressive thermal gap delays the temperature rise along the I‐section steel profile which produces a significant improvement on the composite section fire resistant time, up to 90 or 120 minutes. Additionally, it should be highlighted that the observed improvement on the cross‐section thermal behaviour has been achieved using a novel configuration which no need maintenance in contrast with the common external protection systems using intumescent coating or other fireproofing materials.

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Numerical study on the flexural behaviour of slim-floor beams with hollow core slabs at elevated temperature

Cited by 30 publications

References 12 publications

Fire design of slim‐floor beams

Fire design of slim‐floor beams

Shallow composite floor beams – Proposal of a simplified analytical method for standard fire rating

A Novel Strategy for Slim‐floor Fire Protection

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