Analysis of restrained composite beams exposed to fire using a hybrid simulation approach

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Analysis of restrained composite beams exposed to fire using a hybrid simulation approach

Khan, Mustesin Ali; Jiang, Liming; Cashell, Katherine A; Usmani, Asif; (2018) Analysis of restrained composite beams exposed to fire using a hybrid simulation approach. Engineering Structures , 172 pp. 956-966. 10.1016/j.engstruct.2018.06.048. Green open access

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Abstract

Obtaining an accurate simulation of the boundary conditions is very challenging but it is essential in order to represent the true behaviour of the whole structure in fire. In recent years, hybrid simulation has been emerging as an efficient and economical method for simulating realistic boundary conditions in the field of earthquake engineering. This technique can be used to study the load redistribution that may occur in a structural system as a result of locally elevated temperatures. In this paper, the fire-exposed element will be modelled in one analysis (a 3D model) and the rest of the structure in another analysis (a 2D model). This kind of sub-structuring enables the behaviour of the structural system as a whole to be studied. A hybrid simulation (HS) approach is presented and successfully implemented using the OpenFresco and OpenSees software. This approach enables the simulation of the correct restraint provided by the cold structure to the fire affected structural element. The HS analysis of a composite beam is compared with an unrestrained or simply supported version to highlight the difference in behaviour. Finally, the Cardington restrained beam test is modelled to demonstrate the potential of HS technique. Good agreement with the test results highlights that HS approach can be an effective method for studying the behaviour of the whole structural system.

Type:	Article
Title:	Analysis of restrained composite beams exposed to fire using a hybrid simulation approach
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1016/j.engstruct.2018.06.048
Publisher version:	https://doi.org/10.1016/j.engstruct.2018.06.048
Language:	English
Additional information:	This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions
Keywords:	Structure in fire, Thermo-mechanical analysis, OpenSees, Multiple scale modelling.
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI:	https://discovery.ucl.ac.uk/id/eprint/10163365