Nasze serwisy używają informacji zapisanych w plikach cookies. Korzystając z serwisu wyrażasz zgodę na używanie plików cookies zgodnie z aktualnymi ustawieniami przeglądarki, które możesz zmienić w dowolnej chwili. Więcej informacji odnośnie plików cookies.

Obowiązek informacyjny wynikający z Ustawy z dnia 16 listopada 2012 r. o zmianie ustawy – Prawo telekomunikacyjne oraz niektórych innych ustaw.

Wyłącz komunikat

 
 

Logowanie

Logowanie za pomocą Centralnej Usługi Uwierzytelniania PRz. Po zakończeniu pracy nie zapomnij zamknąć przeglądarki.

Budownictwo i Inżynieria Środowiska

Budownictwo i Inżynieria Środowiska
2018.027, DOI: 10.7862/rb.2018.27

CRITICAL TEMPERATURE EVALUATION FOR A STEEL FRAME WITH JOINT STIFFNESS DECREASING IN FIRE

Mariusz MAŚLAK, Michał PAZDANOWSKI, Małgorzata SNELA
Submitted by: Artur Szalacha

DOI: 10.7862/rb.2018.27

Abstract

A procedure to determine the critical temperature of a selected steel frame bearing structure is presented and discussed. This temperature, in case of fully developed fire, when the temperature of the exhaust gasses enveloping the structural members is equalized within the whole fire zone, may be considered as an impartial measure of safety. The obtained result does not depend on the heating progress but only on the static scheme and the load level in the considered structure. The quantitative and qualitative evaluation of the influence the joint stiffness decreasing in fire exerts on the resultant critical temperature constitutes the basic objective of the authors. It has been shown, that proceeding according to the recommended computational procedure does not necessarily result in an estimate fully unambiguous in interpretation. The critical temperature specified in a global mode, for the whole considered frame, is usually associated with a specific component of such frame, interpreted as the so called “weakest link”. Thus local loss of bearing capacity in such element is in this approach equivalent to the total destruction of the whole bearing structure. Indication, which of the components present in the considered frame should be treated as the critical one, because of its behaviour under fire conditions, seems to be a key to the forecast safety level warranted to the users of the structure. The authors show, that this association changes depending on the selected computational method, and this in turn substantially limits the reliability of the obtained estimate.

Full text (pdf)

References

[1] EN 1993-1-1, Eurocode 3: Design of steel structures, Part 1-1: General rules and rules for buildings.

[2] Autodesk, Robot Structural Analysis 2010. User manual.

[3] EN 1993-1-2, Eurocode 3: Design of steel structures, Part 1-2: General rules – Structural fire design.

[4] EN 1990, Eurocode: Basis of structural design.

[5] Maślak M., Snela M.: Critical temperature of steel frame with joint stiffness decreasing in fire, Scientific Papers of Rzeszów University of Technoloogy, No 283, 2012, Series „Civil and Environmental Engineering”, Vol. 59 (3/12/II), pp. 241–248 (in Polish).

[6] Maślak M., Snela M.: Moment – rotation relationship in fire conditions for a steel beam-to-column joint of known pliability, Building and Architecture, 12 (2), 2013, pp. 237–244 (in Polish).

[7] Maślak M., Snela M.: Flexibility of a steel end-plate beam-to-column joint when exposed to a fire – two different, nonequivalent approaches to evaluate, Proceedings of the Eighth International Conference on Advances in Steel Structures (ICASS 2015), Lisbon, Portugal, July 21–24, 2015, paper 131, CD + pen-drive, 9 p.

[8] Maślak M., Snela M.: Influence of increasing joint flexibility on critical temperature of steel frame in fire, Zbirnik Naukowych Prac Ukrainskogo Institutu Staliewych Konstrukcij imieni W. M. Szimanowskogo, Wipusk 9/2012, Wydawnictwo “Stal”, Kiev, Ukraine, pp. 204–217.

About this Article

TITLE:
CRITICAL TEMPERATURE EVALUATION FOR A STEEL FRAME WITH JOINT STIFFNESS DECREASING IN FIRE

AUTHORS:
Mariusz MAŚLAK (1)
Michał PAZDANOWSKI (2)
Małgorzata SNELA (3)

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

SUBMITTED BY:
Artur Szalacha

JOURNAL:
Budownictwo i Inżynieria Środowiska
2018.027

KEY WORDS AND PHRASES:
steel bearing frame, fire, critical temperature, joint stiffness, moment – rotation relationship, weakest link

FULL TEXT:
http://doi.prz.edu.pl/pl/pdf/biis/1045

DOI:
10.7862/rb.2018.27

URL:
http://dx.doi.org/10.7862/rb.2018.27

COPYRIGHT:
Publishing House of Rzeszow University of Technology Powstańców Warszawy 12, 35-959 Rzeszow

POLITECHNIKA RZESZOWSKA im. Ignacego Łukasiewicza; al. Powstańców Warszawy 12, 35-959 Rzeszów
tel.: +48 17 865 11 00, fax.: +48 17 854 12 60
Administrator serwisu: