Construction with Hollow Steel Sections - Design guide for structural hollow section columns exposed to fire

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Construction with Hollow Steel Sections - Design guide for structural hollow section columns exposed to fire
http://forum.civilea.com/Thread-cons...on-with-hollow
Author: L. Twilt, R. Hass, W. Klingsch, M. Edwards, D. Dutta | Size: 4.37 MB | Format: PDF | Publisher: CIDECT | Year: 1995 | pages: 95 | ISBN: 3824901714

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Rectangular or circular hollow steel sections are often used in construction because of their structural efficiency and also because of their shape, when a visible architectural expression is required. The surface and profile of hollow steel sections are attractive and their high load bearing capacity leads to slim, economic and elegant constructions with large spans. Unprotected structural hollow sections (SHS) have an inherent fire resistance of some 15 to 30 minutes. Traditionally, it has been assumed that unprotected steel members fail when they reach temperatures of about 450 to 550OC. However, the temperature at which a steel member reaches ultimate limit state, is dependent on the massivity of the section and the actual load level. If the service load level of a column is less than 50°/o of its resistance, the critical temperature rises to more than 650°C, which means for bare steel an increase In failure time of more than 20%. When hollow steel sections are required to withstand extended periods in fire, additional measures, such as the following have to be taken to delay the rise in steel temperature.

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