Fire resistance of reinforced concrete columns with L-, T-, and +-shaped cross-sections

Xu, Yuye; Wu, Bo

doi:10.1016/j.firesaf.2009.04.002

Cited by 65 publications

(28 citation statements)

References 12 publications

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“…Two columns with "+" and "T" section were analyzed, following the same conditions of the experiments performed by Xu and Wu [2]. The tests consisted of applying a centrally compression axial load to the column, which remained constant during exposure to fire, until rupture of the structural element.…”

Section: Experiments Of Xu and Wu [2]mentioning

confidence: 99%

“…In order to obtain cross-section temperatures during the test, the authors installed thermocouples at four points in the section, as shown in Figure 7. Thus, it was possible to compare the temperatures calculated by Pisafo with the temperatures measured and calculated by Xu and Wu [2], according to Figure 8. There was a good agreement between the experimental results and those obtained by Pisafo.…”

Section: Experiments Of Xu and Wu [2]mentioning

confidence: 99%

“…To avoid further material losses and especially lives, research in the field of fire has intensified more and more. Experiments with the goal of investigating the behavior of reinforced concrete elements subjected to high temperatures [2,3,4,5], researches for the analysis of thermal and thermomechanical problems of structures [6,7,8,9], studies that have investigated and provided simplified [10,11,12,13,14] and alternative [15,16,17] methods for design and verification of reinforced concrete elements have been performed in recent times. Studies on design up to that time were limited to analyzing rectangular sections of reinforced concrete in fire situation, comprising only normal composite bending.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Computational algorithm for the verification of reinforced concrete sections in fire situation

Padre

Ribeiro

Alvarenga

et al. 2019

Rev. IBRACON Estrut. Mater.

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Reinforced concrete structures may have reduced strength due to the degradation of their mechanical properties by temperature. This can increase the risk of structural collapses. Thus, the structural design should consider its behavior at room temperature and in fire situation (ABNT NBR 14432:2001). This study presents the development of an algorithm to verify the strength of any reinforced concrete sections subjected to unsymmetrical bending at room temperature and in fire situation. For this purpose, a stress integration algorithm was implemented from the strain profile of the section according to ABNT NBR 15200:2012, linked to a finite element mesh generator and a thermal analysis algorithm. For validation of the developed program, called Pisafo, the results obtained were compared with those in the technical literature: obtained in experiments (with differences of up to 28.5%) and with recognized software solutions (with differences of up to -14.8%). The largest variations in relation to the experiments can be attributed to the differences between the thermal properties of the concrete in the experiments with those prescribed in the technical standards used by the program and the non-consideration of spalling in the computational analysis.

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Section: Experiments Of Xu and Wu [2]mentioning

confidence: 99%

Section: Experiments Of Xu and Wu [2]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computational algorithm for the verification of reinforced concrete sections in fire situation

Padre

Ribeiro

Alvarenga

et al. 2019

Rev. IBRACON Estrut. Mater.

View full text Add to dashboard Cite

show abstract

“…A fiber beam element model, which takes into account the effect of high temperature, was developed to simulate the RC beams and columns on the ground floor. Existing research has demonstrated that this type of element model can simulate fire-induced mechanical behavior of RC elements with various cross sections [34]. Using this model, only six fiber beam elements along the longitudinal direction were required to represent a beam or a column, resulting in high computational efficiency.…”

Section: Numerical Model For the Ground Floor Rc Framementioning

confidence: 99%

A Case Study on a Fire-Induced Collapse Accident of a Reinforced Concrete Frame-Supported Masonry Structure

Guan

et al. 2015

Fire Technol

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In 2003, an 8-storey reinforced concrete (RC) frame-supported masonry structure, located in Hengyang City, China, underwent a severe fire-induced collapse accident. Information on the structure and the fire scenario is presented. It includes the design data, the site observation record of the fire incident, and the laboratory material test results. Preliminary investigation reveals that about 45.9% of the bottom storey of the RC frame experienced temperatures in excess of 800°C, and its central area reached 1300°C. Such a severe fire load, of fairly high temperature and large area, is thought to be the primary cause of the progressive collapse of the entire building structure. To better understand the collapse mechanism, this study presents a coupled thermo-mechanical numerical simulation of the building collapse. The actual collapse area is well reproduced by the proposed numerical model. The simulation further demonstrates that the initial damage happened to two interior columns exposed to temperature of 1300°C. Such damage was also attributable to the large gravity load they carried, and the complicated nature of the local structural arrangements. The adjacent structural members were subsequently damaged, because they were also weakened by the fire, and were over-loaded by the redistributed load. Failure of the two interior columns and adjacent area eventually triggered a progressive collapse. Further, the effect of some critical factors on the collapse mechanism is discussed. On the basis of this numerical case study, practical design considerations on the key structural components, the fire compartments, and the structural robustness are given for the prevention of the fire-induced progressive collapse of RC frame structures.

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“…Another important thing was that the restraint on thermal elongation can be beneficial for the columns' fire performance if the surrounding structure is able to redistribute part of the load. Thirdly, Ali et al (2004), Xu and Wu (2009) concluded that increasing the loading level decreased the restraining forces and column failure times. As well as that it was also observed for normal-strength concrete that increasing the restraining degree increased the degree of spalling (Ali et al 2004) and can induce significant additional axial forces in columns ).…”

Section: Introductionmentioning

confidence: 99%

Fire Behaviour of Circular Concrete Columns with Restrained Thermal Elongation

Rodrigues

Laím

Korzen

2014

ACT

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Most of the previous studies on reinforced concrete columns with elastically restrained thermal elongation were carried out on square, rectangular or '+'-shaped cross sections. The number of fire resistance tests on circular reinforced concrete columns with elastically restrained thermal elongation is still very small. In order to examine the influence of several parameters on the behaviour in fire of this type of columns several fire resistance tests were carried out. The parameters tested were the load and restraint level, slenderness of the column and longitudinal reinforcement ratio. In the fire resistance tests the specimens were exposed to the ISO 834 standard fire curve and the critical time (fire resistance) and temperature and failure modes were determined. The test results showed that the spalling phenomenon may occur in circular columns and so reducing its fire resistance. The increasing of the load level led to a reduction while the increasing of the longitudinal reinforcement ratio or the decreasing of the slenderness of the columns led to an increasing of their fire resistance. The restraint level might not be much relevant on the fire resistance of circular reinforced concrete columns.

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Fire resistance of reinforced concrete columns with L-, T-, and +-shaped cross-sections

Cited by 65 publications

References 12 publications

Computational algorithm for the verification of reinforced concrete sections in fire situation

Computational algorithm for the verification of reinforced concrete sections in fire situation

A Case Study on a Fire-Induced Collapse Accident of a Reinforced Concrete Frame-Supported Masonry Structure

Fire Behaviour of Circular Concrete Columns with Restrained Thermal Elongation

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