Influence of design durability on concrete columns fire performance

Bolina, Fabrício Longhi; Gil, Augusto Masiero; Fernandes, Bruno; Hennemann, Guilherme Günther; Gonçalves, Jordana; Tutikian, Bernardo Fonseca

doi:10.1016/j.jmrt.2020.03.015

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…However, Kodur et al [25] noted that most studies evaluated UHPC performance solely through test bodies. This agreed with Gil et al [26], which denoted that an analysis of cylindrical test bodies was essential, but insufficient, to fully assess the behavior of the mixture in realistic structural elements.…”

Section: Introductionsupporting

confidence: 89%

Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing

Christ,

Lerner,

Ehrenbring

et al. 2023

Buildings

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Ultra-high-performance concrete (UHPC) is a material that has high compactness, low porosity, and high mechanical strength, with especially high tensile strength. Due to these characteristics, the behavior of the material when exposed to high temperatures is debatable. The high amount of fibers in the mixture, which makes UHPC present a high tensile strength, is seen as one of the arguments for the good performance of the material when exposed to high temperatures. The objective of this study was to evaluate the behaviors of ultra-high-performance concrete columns with hybrid steel and polypropylene fibers and no loose reinforcements when subjected to elevated temperatures after 180 days of curing. The exposure of concrete with a low age, less than 90 days, to high temperatures results in greater damage to the concrete due to spalling, and because of this, this study sought to evaluate the UHPC with a higher age. Two columns were manufactured with a cross-section of 250 mm × 250 mm and a height of 2800 mm. A heating regime followed the heating curve of standard ISO 834-1. The physical characteristics of the samples were evaluated during and after exposure to high temperatures with measurements of the decreases in the cross-section and surface aspect. Effects on the compressive strength, modulus of elasticity, and apparent density were evaluated with cylindrical test bodies of 100 mm in diameter and 200 mm in height. These samples were cured for 180 days, subjected to the same heating regime, and evaluated after cooling. The results showed an increase in the compressive strength with an increasing temperature up to a factor of 30% at a temperature of 400 °C. The modulus of elasticity and apparent density decreased gradually as the temperature increased, with maximum decreases of 29% and 6%, respectively. Throughout heating, audible cracks were heard from the columns because of spalling. The spalling frequency peaked at an oven temperature of 600 °C, and testing was suspended at 78 min after the complete rupture of a column section. On average, 46.5% of the column cross-sections suffered from spalling.

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Section: Introductionsupporting

confidence: 89%

Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing

Christ,

Lerner,

Ehrenbring

et al. 2023

Buildings

Self Cite

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“…For example, Dwaikat and Kodur [7] attributed the loss in fire resistance to the occurrence of spalling. Bolina et al [8] fabricated 16 concrete columns of equal dimensions with four different mix designs for strength. In each group of four, the concrete cover was varied.…”

Section: Introductionmentioning

confidence: 99%

Simple Visual Aids for Predicting Fire Response of RC Columns: Nomograms via Machine Learning

Naser,

Tapeh,

Hostetter

et al. 2023

EJCEA

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Assessing the ability of reinforced concrete (RC) columns to withstand the effects of fire is a multifaceted and intricate problem due to the various factors that influence their fire response. As such, engineers may find it challenging to precisely predict such fire resistance. While some codal provisions exist and fire testing/advanced modeling can be adopted, the same methods may suffer from poor predictivity and can be costly and/or complex. In this paper, we shift focus toward machine learning techniques (by means of Nomograms) that can produce simple visual aids to assess the fire resistance of RC columns. Our analysis shows that Nomograms can be accurate, account for a series of factors currently absent from our domain knowledge and provisions, and outperform existing methods adopted in building codes. Our analysis also infers that such Nomograms could be possible candidates for adoption in standardized settings, given their simplicity, ease of use, and lack of multi-stepped procedures.

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“…El concreto es uno de los materiales más utilizados en la industria de la construcción debido a su resistencia, durabilidad y gran disponibilidad de componentes (Talal & Arsalan, 2020), por lo tanto este es indispensable para la creación de un sinnúmero de estructuras, lo cual conlleva al desarrollo de los países (Buch & Sharma, 2019), elementos estructurales como los muros de concreto armado, vigas, columnas son muy utilizados en los edificios en general (Bolina et al, 2020), por lo que resulta de gran prioridad analizar este material frente a eventos que además de los sismos y las cargas de gravedad puedan afectarlo, como es la exposición a temperaturas elevadas teniendo en cuenta que la crecida de números de incendios en todo el planeta han aumentado considerablemente (Buch & Sharma, 2019), debido a esto las investigaciones para poder evaluar y predecir el comportamiento de este material se han visto incrementadas notoriamente (Dvorkin et al, 2018).…”

Section: Introductionunclassified

Comportamiento Térmico y Estructural del Concreto Expuesto a Altas Temperaturas: Una Revisión de la Literatura

Barboza

Monja

Pérez

2021

IRR

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ResumenLas altas temperaturas originadas por un incendio, ambientes de trabajo o uso, son conocidos por degradar gravemente a los materiales de construcción, siendo el concreto uno de los más utilizados, afectando así las propiedades mecánicas, físicas y químicas. Debido a la importancia del comportamiento del concreto a altas temperaturas, se han incrementado el estudio. Bajo este punto se revisaron 56 artículos indexados entre los años 2015 al 2020 los cuales se distribuyen de la siguiente manera: 21 artículos son de Scopus, 18 de Scielo y 17 de ScienceDirect sobre la influencia de la temperatura en parámetros como resistencia a la compresión, resistencia a la flexión, módulo de elasticidad, el desprendimiento del mismo, así como la influencia de tipos de agregados, aditivos y fibras. Concluyendo que la adición de ciertos componentes externo al concreto en la exposición a altas temperaturas puede ayudar a mejorar la resistencia a la compresión, como las fibras de acero, sin embargo, éstas no mitigan totalmente el daño en condiciones extremas.

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Influence of design durability on concrete columns fire performance

Cited by 7 publications

References 17 publications

Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing

Evaluation of Ultra-High-Performance Concrete Columns at High Temperatures after 180 Days of Curing

Simple Visual Aids for Predicting Fire Response of RC Columns: Nomograms via Machine Learning

Comportamiento Térmico y Estructural del Concreto Expuesto a Altas Temperaturas: Una Revisión de la Literatura

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