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Budownictwo i Inżynieria Środowiska

Budownictwo i Inżynieria Środowiska
2018.021, DOI: 10.7862/rb.2018.21

TEMPERATURE DISTRIBUTION IN A STEEL BEAM-TO-COLUMN JOINT WHEN EXPOSED TO FIRE. PART 1: END-PLATE JOINT

Mariusz MAŚLAK, Maciej SUCHODOŁA, Piotr WOŹNICZKA
Submitted by: Artur Szalacha

DOI: 10.7862/rb.2018.21

Abstract

Temperature distribution usually observed in steel beam-to-column end-plate joint after 15 minutes of its standard fire exposure is presented and discussed in detail. Two types of joints are analysed for comparative purposes. The first one is a pure steel connection while the other is covered by a reinforced concrete slab. Numerical simulation of the considered joint heating scenario was performed using the 3D model in the ANSYS environment. Some results were additionally verified by simpler calculations carried out on 2D models using the SAFIR computer program. It is emphasized that due to the local accumulation of many massive steel plates the representative temperature values identified in particular joint components are significantly lower than those which at the same time are measured in beam and column outside the connection. This means that the classic assumption of even temperature over the entire length of all the structural elements of a frame load-bearing structure exposed to fire at any time during such fire, without distinguishing in the formal model any cooler nodal elements, is always safe but very conservative. In addition, as the fire develops the differentiation between the temperature values relating to the beam web and to the beam flanges becomes more visible. This effect is particularly significant in the presence of a massive floor slab adjacent the upper flange of a frame I-beam which effectively cools it.

Full text (pdf)

References

[1] Franssen J.-M., Gernay T.: Modelling structures in fire with SAFIR®: Theoretical background and capabilities, Journal of Structural Fire Engineering, 8(3), 2017, pp. 300–323.

[2] Kohnke P. (Ed.): ANSYS®: Theory reference. Release 5.6. Canonsburg, PA, USA, November 1999.

[3] Maślak M., Pazdanowski M., Snela M.: Redistribution of internal forces generated in a steel frame structure with flexible joints when exposed to a fire, in: Giżejowski M., Kozłowski A., Marcinowski J., Ziółko J. (Eds.) – Recent progress in steel and composite structures, Proceedings of the 13th International Conference on Metal Structures (ICMS 2016), Zielona Góra, Poland, June 15-17, 2016, CRC Press/Balkema, Leiden, The Netherlands, abstract pp. 136-137, paper CD, pp. 315–322.

[4] Maślak M., Pazdanowski M., Woźniczka P.: Influence of joint stiffness on the behaviour of steel bearing frame under fire conditions, Ce/Papers, The Online Collection for Conference Papers in Civil Engineering, Ernst & Sohn, A Wiley Brand, 1 (2017), No. 2 & 3, pp. 2811–2820.

About this Article

TITLE:
TEMPERATURE DISTRIBUTION IN A STEEL BEAM-TO-COLUMN JOINT WHEN EXPOSED TO FIRE. PART 1: END-PLATE JOINT

AUTHORS:
Mariusz MAŚLAK (1)
Maciej SUCHODOŁA (2)
Piotr WOŹNICZKA (3)

AUTHORS AFFILIATIONS:
(1) Cracow University of Technology
(2) Cracow University of Technology
(3) Cracow University of Technology

SUBMITTED BY:
Artur Szalacha

JOURNAL:
Budownictwo i Inżynieria Środowiska
2018.021

KEY WORDS AND PHRASES:
beam-to-column steel end-plate joint, fire, temperature distribution, joint components, numerical simulation

FULL TEXT:
http://doi.prz.edu.pl/pl/pdf/biis/1036

DOI:
10.7862/rb.2018.21

URL:
http://dx.doi.org/10.7862/rb.2018.21

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