fib Bulletin 46. Fire design of concrete structures – structural behaviour and assessment

Taerwe, Luc; Bamonte, Patrick; Both, Kees; Denoël, Jean-François; Diederichs, Ulrich; Dotreppe, Jean-Claude; Felicetti, Roberto; Fellinger, J.; Franssen, Jean‐Marc; Gambarova, Pietro G.; Lennon, Tom; Meda, Alberto; Msaad, Yahia; Ožbolt, Joško; Periškić, Goran; Riva, Paolo; Robert, Fabienne; Acker, Arnold Van

doi:10.35789/fib.bull.0046

Cited by 19 publications

(5 citation statements)

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“…Although a fire can result in deteriorations of the mechanical property of HSC, causing the decrease of the bearing capacity of a component, the structure rarely collapses during a fire 23,24 . Consequently, HSC element and structure continue to be in service after the post‐fire safety assessment and/or repair.…”

Section: Research Significancementioning

confidence: 99%

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Xie

2020

Structural Concrete

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A series of tests were conducted to study the variability of the residual compressive strength for high‐strength concrete (HSC) after elevated temperatures, and then a calculation process was developed to study the reliability of the residual moment capacity of HSC beams after a fire. The experimental results indicated that the mean values and the characteristic values of the residual compressive strength of HSC were reduced with the increasing elevated temperatures. The standard deviation of the residual compressive strength of HSC was increased when the temperature ranged from 20 to 400°C and decreased from 400 to 800°C. Regardless of the elevated temperatures, the residual compressive strength of HSC followed the normal distribution. The reliability index of the residual moment capacity of HSC beam was decreased with the increasing fire duration. The decrease rate of the reliability index became lower and kept constant when the section height–width ratio was beyond 2.75 and the longitudinal reinforcement ratio was higher than 1.43%. As the load effect ratio was increased, the decrease rate of the reliability index was reduced regardless of the section size, the height–width ratio, and the reinforcement ratio.

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Section: Research Significancementioning

confidence: 99%

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Xie

2020

Structural Concrete

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“…Load bearing elements of typical structures can be calculated using the so-called tabulated data [12]. In more demanding cases, fire resistance of structures can be determined by simple analyses in which the fire is regarded as an emergency event and it is on this basis that ultimate bearing capacity values can be checked [12,13]. Tabulated data offer a recognisable calculation-based solution for fire exposure lasting no more than 240 minutes.…”

Section: Study Of Fire Effect In Reinforced-concrete Elementsmentioning

confidence: 99%

Overview of research on fire effects in RC elements and assessment of RC structures after fire

Lakušić¹

2021

JCE

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Procedures for estimating damage and remaining bearing capacity of RC structures after fire are presented in the paper. The paper describes the effect of fire on structures, the danger it poses for the loss of human lives, and financial losses it may generate. The damage to structural RC elements of a column, beam, slab, wall, and connection details, is presented in the paper. Although RC elements are generally considered to be fire resistant, their physical and mechanical characteristics are greatly influenced by temperature, while the bearing capacity before and after fire can be determined through a number of different methods that are presented in the paper. An overview of condition assessment for RC structures after fire is proposed, and methodology for taking further action is presented.

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“…Furthermore, concrete structures are typically resilient, allowing them to tolerate localized damage without compromising the ultimate structural strength. However, the literature with actual fires indicates that a detailed comprehension of concrete behaviour and structural mechanics is still required to be studied to enhance fire resistance [1].…”

Section: Introductionmentioning

confidence: 99%

Determination of structural reliability of a reinforced concrete slab under fire Load

et al. 2022

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Four reinforced concrete rooms are used in this study, with varying floor areas, openings, and fuel loads. These rooms are office, Classroom, computer, and chemical laboratories of institutional buildings. The time versus Eurocode (EC) parametric fire relationship is determined and compared with ISO 834 and ASTM 119. The performance of the slab is evaluated based on the EC target reliability index of 3.8 for 50 years design period using the First Order Reliability Method (FORM). The probability of failure and structural reliability of each fire compartment at different fire duration is determined. Variables used were concrete compressive strength, a reduction factor of concrete compressive strength, steel yield strength, concrete cover, slab depth, unit width, and area of steel reinforcement provided. The reliability is determined at each 30 minutes fire duration for all fire compartments. The starting point is ambient temperature, then after every thirty minutes until the time when the maximum gas temperature is reached. The fire compartments were able to show fire resistance for two hours and then started to drop over time. Yield strength reduction factor, concrete cover, and area of reinforcement respectively were the most significant variables to determine the reliability index. The structure was able to withhold fire until two hours with a reliability of more than 3.8after that, the slab reliability was less than the target reliability and will need a repair.

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fib Bulletin 46. Fire design of concrete structures – structural behaviour and assessment

Cited by 19 publications

References 0 publications

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Reliability analysis of the residual moment capacity of high‐strength concrete beams after elevated temperatures

Overview of research on fire effects in RC elements and assessment of RC structures after fire

Determination of structural reliability of a reinforced concrete slab under fire Load

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