Interaction diagrams for fire-exposed reinforced concrete sections

El-Fitiany, Salah El-Din F.; Youssef, Maged A.

doi:10.1016/j.engstruct.2014.03.029

Cited by 34 publications

(26 citation statements)

References 6 publications

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“…Figure shows the percentages of residual compressive strength for the different kinds of concrete and cooling system. Figure displays some stress–strain curves obtained during compression tests …”

Section: Resultsmentioning

confidence: 99%

“…Figure 3 displays some stressstrain curves obtained during compression tests. 20 The results for splitting tensile strength f 0 t , carbonation depth d, absorption capacity C, and water sorptivity S are given in Table 2, and density ρ, absorption A, and porosity P in Table 3 for all concrete qualities and temperature ranges studied. These tests were run 90 days after casting and after the proper heating cycle.…”

Section: Physical and Mechanical Propertiesmentioning

confidence: 99%

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Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems

et al. 2017

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Over their lifetime, concrete structures can suffer from different pathologies, one of them is exposure to high temperatures, which diminishes their load‐bearing capacity. This study describes how different concrete types were exposed to high temperatures. To simulate fire extinction, where the temperature of the overheated concrete descends suddenly, different cooling systems were applied: slowly cooling in the open air and fast cooling by spraying different water volumes. Several physical–mechanical characteristics were analyzed such as compressive strength, splitting tensile strength, porosity, capillary suction, and carbonation depth. Ultrasound nondestructive tests were conducted to quantify deterioration. A petrographic study using a stereomicroscope and microscopy of polarization was performed on thin sections to evaluate aggregate composition and concrete characteristics, focusing on interface areas. Physical and mechanical properties were affected by the increase in temperature, with damage worsening through the appearance of cracks and microcracks when water is used as a cooling system.

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Section: Resultsmentioning

confidence: 99%

Section: Physical and Mechanical Propertiesmentioning

confidence: 99%

Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems

et al. 2017

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“…Most of the studies available in the literature deal with the fire problem analytically or numerically due to the difficulty of carrying out experiments in this area. They are mainly dedicated to assess the behavior under fire conditions of columns (Ali et al, 2010;El-Fitiany and Youssef, 2014;Buch and Sharma, 2017;Buch and Sharma, 2019;Gernay 2019) or beams (Han et al, 2010;Han et al, 2013;Gao et al, 2013;Sun et al 2018). Ribeiro (2004) evaluated for reinforced concrete slabs and columns, the accuracy of the procedures suggested by Brazilian standards.…”

Section: Introductionmentioning

confidence: 99%

A limit analysis approach to the stability assessment of reinforced concrete panels in fire conditions

Machado

Dutra

Maghous

2020

Lat. Am. j. solids struct.

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The present study investigates the stability conditions of reinforced concrete panels subjected to fire loading within the framework of limit analysis theory. The method relies in a first step upon the preliminary determination of the temperature dependent interaction diagrams of the structural element. Interaction diagrams derived from the static approach are shown to depend on the geometry of panel cross-section as well as on the strength properties of the constituents, which degrade continuously as fire proceeds. The second step of the method consists in determining the deformed configuration of panel from the analysis of thermo-elastic equilibrium of the structure. The stability analysis and design of the panel in its deformed geometry are then carried out by comparing the distribution of internal efforts to its reduced strength capacities expressed by means of the associated interaction diagrams evaluated in the first step. Several numerical examples are presented to assess the effect of relevant parameters on the overall fire safety of the structure, emphasizing the effectiveness of the approach for design purposes.

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“…To this aim, it is well known that Finite Element (FE) numerical models can be used to realistically predict the thermo or mechanical (and even combined) behavior of concrete (or other general materials in fire conditions). Reliable modelling strategies for concrete in fire are reported in [24,25]. In this paper, with the support of the ABAQUS /Standard computer software [33], the attention is focused on the thermal boundaries and expected predictions for the tested cubic specimens, showing the potential and limits of the FE method (Section 3).…”

Section: Introductionmentioning

confidence: 99%

Study on the Compressive Behaviour of Sustainable Cement-Based Composites Under 1-Hour Direct Flame Exposure

Vedrtnam¹,

Bedon²,

Barluenga³

2020

Preprint

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Fire is a significant threat to human life and civil infrastructures. Builders and architects are hankering for safer and sustainable alternatives of concrete that do not compromise with their design intent or fire safety requirements. The aim of the present work is to improve the residual compressive performance of concrete in the post-fire exposure, by incorporating by-products from urban residues. Based on sustainability and circular economy motivations, the attention is focused on rubber tire fly ash, aged brick powder, and plastic (PET) bottle residuals used as partial sand replacement. The selected by-products from urban residues are used for the preparation of Cement-Based Composites (CBCs) in two different proportions (10 % and 15 %). The thermal CBC behaviour is thus investigated under realistic fire scenarios (i.e., Direct Flame (DF) for 1 hour (1h)), by following the ISO 834 standard provisions, but necessarily resulting in non-uniform thermal exposure for the cubic specimens. The actual thermal exposure is further explored with a Finite Element (FE) model, giving evidence of thermal boundaries effects. The post-fire residual compressive strength of heated concrete and CBC samples is hence experimentally derived, and compared to unheated specimens in ambient conditions. From the experimental study, the enhanced post-fire performance of CBCs with PET bottle residual is generally found superior to other CBCs or concrete. The structure-property relation is also established, with the support of Scanning Electron Microscopy (SEM) micrographs. Based on existing empirical models of literature for the prediction of the compressive or residual compressive strength of standard concrete, newly developed empirical relations for both concrete and CBCs are assessed.

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Interaction diagrams for fire-exposed reinforced concrete sections

Cited by 34 publications

References 6 publications

Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems

Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems

A limit analysis approach to the stability assessment of reinforced concrete panels in fire conditions

Study on the Compressive Behaviour of Sustainable Cement-Based Composites Under 1-Hour Direct Flame Exposure

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