Some recent research from Edinburgh staff and students have found their way into academic journals.
Title: An application of the PEER performance based earthquake engineering framework to structures in fire
Journal: Engineering Structures [01/2014; Vol. 66: pgs100–115].
DOI: http://dx.doi.org/10.1016/j.engstruct.2014.01.052
Authors: David Lange (SP, Sweden), Shaun Devaney, Asif Usmani (both University of Edinburgh)
Keywords: Structures in fire; Performance based design; PEER; Fire engineering; Probabilistic analysis.
Abstract: The Pacific Earthquake Engineering Research (PEER) Center’s Performance Based Earthquake Engineering (PBEE) framework is well documented. The framework is a linear methodology which is based upon obtaining in turn output from each of the following analyses: hazard analysis; structural analysis; loss analysis, and finally decision making based on variables of interest, such as downtime or cost to repair.
The strength of the framework is in its linearity, its clear flexibility and in the consideration of uncertainty at every stage of the analysis. The framework has potential applications to other forms of extreme loading; however in order for this to be achieved the ‘mapping’ of the framework to the analysis of structures for other loading situations must be successful.
This paper illustrates one such ‘mapping’ of the framework for Performance Based Fire Engineering (PBFE) of structures. Using a combination of simple analytical techniques and codified methods as well as random sampling techniques to develop a range of response records, the PEER framework is followed to illustrate its application to structural fire engineering. The end result is a successful application of the earthquake framework to fire which highlights both the assumptions which are inherent in the performance based design framework as well as subjects of future research which will allow more confidence in the design of structures for fire using performance based techniques.
This article describes the PEER framework applied to structural earthquake design then follows the framework from start to completion applying suitable alternative tools to perform each stage of the analysis for structures in fire.
Title: Design of intumescent fire protection for concrete filled structural hollow sections
Journal: Fire Safety Journal [Vol.67; (2014); pgs 13–23]
DOI: http://dx.doi.org/10.1016/j.firesaf.2014.05.004
Authors: David Rush, Luke Bisby (both Univeristy of Edinburgh) Martin Gillie (University of Manchester), Allan Jowsey (International Paint Ltd.), Barbara Lane (Arup)
Keywords: Composite columns; Intumescent fire protection; Forensic analysis; Section factor; Limiting temperature; Design.
Abstract: Design of intumescent
protection systems for concrete filled structural steel hollow (CFS) sections in
the UK typically requires three input parameters in practice: (1) a required
fire resistance rating; (2) and ‘effective’ section factor; and (3) a limiting steel
temperature for the hollow structural section.
While the first of these inputs is generally prescribed in building
codes, the latter two require greater engineering knowledge and judgement. This paper examines results from standard
furnace tests on 26 CFS sections, 14 of which were protected with intumescent
coatings by application of current UK design guidance. The protected sections
demonstrate highly conservative fire protection under standard fire exposure, a
conservatism not typically observed for protected unfilled steel hollow
sections. The possible causes of the observed conservatism are discussed, and it
is demonstrated that the method currently used to calculate the effective
section factor for protected CFS columns is based on a false presumption that both
unprotected and protected CFS columns can be treated in the same manner. A
conservative method for determination of the steel limiting temperature for CFS
columns is proposed; this can be applied by designers to more efficiently
specify intumescent fire protection for CFS members.
