Fire resistance analysis of steel structures

Проанализирована взаимосвязь разброса значений пределов огнестойкости стальных конструкций со вспучивающимися огнезащитными покрытиями и соответствующего этому разбросу интервала толщины огнезащитного покрытия. Предложена методика, на основании которой может быть осуществлен выбор необходимой толщины огнезащитного покрытия в зависимости от заданных значений дисперсии предела огнестойкости и приведенной толщины конструкции при заданной доверительной вероятности.An analysis of a relationship between fire resistance limits scatter for steel structures coated with intumescent fire retardant coating and an appropriate interval of thicknesses of the coating was carried out. A methodology for the determination of this relationship was proposed. This methodology was tested on a practical example. A steel structure with a reduced thickness of 6 mm was considered. A typical dependence of the required thickness of the structure was taken into account. A ratio of a mean square deviation of the fire resistance limit to this limit was accepted to be equal 0.1. Using these values an appropriated interval of the thicknesses of the intumescent fire retardant coating was determined. This interval can be calculated for any given confidence level. Boundaries of this interval can be not symmetric in relation to the value of the normative thickness of the fire retardant coating. The proposed methodology can be used for the determination of the required thicknesses of the intumescent fire retardant coatings on steel structures for the given r value, reduced thickness of the structure and the confidence level.

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Performance-Based Analysis of Single-Layer Cylindrical Steel Reticulated Shells in Fire

Applied Sciences ◽

10.3390/app10093099 ◽

2020 ◽

Vol 10 (9) ◽

pp. 3099

Author(s):

Zhiwei Yu ◽

Chen Lu ◽

Yiqin Zhong

Keyword(s):

Fire Resistance ◽

Rapid Development ◽

Single Layer ◽

Steel Structures ◽

Temperature Fields ◽

Fe Model ◽

Fire Dynamics ◽

Interior Space ◽

Coating Materials ◽

Fire Scenarios

With the rapid development of architectural technology, long-span structures have been widely used due to their vast interior space and beautiful architectural composition. Due to the characteristics and high costs of coating materials on large steel structures, fire resistance designs for these kinds of structures have become more and more important. This paper presents comprehensive case analyses of the fire performance of single-layer cylindrical reticulated shells. Nonuniform fire temperature fields of single-layer cylindrical reticulated shells in different fire scenarios were generated using a Fire Dynamics Simulator (FDS). The influences of different parameters on the air temperature field during a fire in a reticulated shell structure were analyzed. A Finite Element (FE) model was developed using the FE software ABAQUS to model the structural behavior of single-layer cylindrical reticulated shells in different fire scenarios. The effects of various parameters on the responses of single-layer cylindrical reticulated shells during a fire were investigated. Using the results from the performance-based analysis in this research, we propose some recommendations for fire resistance designs for single-layer cylindrical reticulated shells.

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Research on Fire Resistance Performance of Pre-Stressed Suspended Steel Reticulated Shell

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.790 ◽

2010 ◽

Vol 163-167 ◽

pp. 790-794

Author(s):

Feng Bo Yu ◽

Xin Tang Wang ◽

Ming Zhou ◽

Wan Zhen Wang

Keyword(s):

High Temperature ◽

Fire Resistance ◽

Steel Structure ◽

Steel Structures ◽

Space Structure ◽

International Standards ◽

Large Space ◽

Finite Element Software ◽

Large Space Structure ◽

Fire Scene

Pre-stressed steel structures with large space are widely used in stadium, exhibition hall, theater and other buildings today. In order to study the fire-resistance behavior of suspended steel lattice shell of a stadium, the method of performance-based fire resistance design is used. First of all, the stadium physical model is established and the software FDS is used to determine the heating curves of the measuring points of the large space structure for two fire scenes. Compared with international standards heating curve, the heating curves of the large space structure obtained here has characteristic of local high-temperature. The finite element software MSC.MARC is further used to simulate the fire behavior of the pre-stressed steel structure with large space, in which the fire scene with 10MW design power of fire source and 30 minutes duration of fire are considered and two loading ways that overall non-uniform temperature field loading and the local high temperature components loading are accepted. The results show that the pre-stressed steel structure with large space has good fire resistance behavior, and the overall failure will not take place for the fire scene suggested here during 30 minutes duration of fire.

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Design Study of Steel Structure Fire-Retardant Coatings under High Temperature (Fire) Conditions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.594-597.849 ◽

2012 ◽

Vol 594-597 ◽

pp. 849-859

Author(s):

Man Li Ou ◽

Wei Jun Cao ◽

Long Min Jiang ◽

Hui Cao

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Fire Resistance ◽

Fire Protection ◽

Structural Damage ◽

Fire Retardant ◽

Steel Structure ◽

Steel Structures ◽

Strength And Stiffness ◽

Fire Conditions

As the result of great changes occurring to mechanical properties under high temperature (fire) conditions, steel structures will soon lose the strength and stiffness and lead to structural damage. Through analysis of the steel structure fire resistance design methods under the conditions of high temperature (fire), this article explores the most used fire protection methods in steel structures—brushing or painting fire-resistant coatings, studies the fire-resistance theory of steel structure under fire conditions; in addition, the author proposes the reasonable thickness of the steel structure fire retardant coating of fire-resistant design through design examples.

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Analysis of Mechanics Characteristics of Prestressed Steel Column in High Temperature (Fire) Condition

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.351-352.505 ◽

2013 ◽

Vol 351-352 ◽

pp. 505-509

Author(s):

Qiang Sun ◽

Yan Hu ◽

Ding Tang Wang

Keyword(s):

High Temperature ◽

Fire Resistance ◽

Steel Structures ◽

Prestressing Steel ◽

Fire Condition ◽

Steel Column ◽

Practical Engineering ◽

Column Design ◽

High Temperature Condition ◽

Mechanics Characteristics

According to the requirements of fire scientific theory and the fire resistance design of structures, and combined with the practical engineering and based on the building damage situations that may occur, this paper analyzes the characteristics of mechanical behavior of prestressed steel column in high temperature condition (fire). It puts forward that how to consider the effects of high temperature parameters and prestressed loss on the structural bearing capacity in prestressing steel column design, and may provide reference values for the fire resistance design of steel structures.

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Behaviour of steel frames under fire conditions

Canadian Journal of Civil Engineering ◽

10.1139/l98-056 ◽

1999 ◽

Vol 26 (2) ◽

pp. 156-167 ◽

Cited By ~ 5

Author(s):

D I Nwosu ◽

VKR Kodur

Keyword(s):

Fire Resistance ◽

Steel Frames ◽

Load Ratio ◽

Steel Structures ◽

Point Of View ◽

Frame Structures ◽

Structural Behaviour ◽

Analysis And Design ◽

In Fire ◽

Fire Conditions

A state-of-the-art review of the behaviour of steel frame structures in fire is presented. Results from different studies indicate that the behaviour of a complete structure is different from that of a single structural member under fire conditions from the point of view of fire resistance. Earlier studies also show that analysis and design of steel structures against fire based on their overall behaviour could lead to a reduction or the elimination of applied fire protection to certain structural members. The effects of continuity, restraint conditions, and load ratio on the fire resistance of frame structures are discussed. The beneficial aspects derived from considering overall structural rather than single-member behaviour in fire are illustrated through the analysis on two one-bay, one-storey, unprotected steel portal frames, a column, and a beam. Also comparison is made between the performance of a beam with different end restraints in fire. Results from the analyses indicate that the fire resistance of a member is increased when it is considered as part of a structure compared with when it is considered as a single member.Key words: steel, frames, fire resistance, buckling, loads, overall structural behaviour.

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