Edinburgh Research Archive >
Engineering, School of >
BRE Centre for Fire Safety Engineering >
BRE thesis and dissertation collection >
Please use this identifier to cite or link to this item:
|Title: ||Risk and Performance Based Fire Safety Design of Steel and Composite Structures|
|Authors: ||Lange, David|
|Supervisor(s): ||Usmani, Asif|
Torero, Jose L
|Issue Date: ||2009|
|Publisher: ||The University of Edinburgh|
|Abstract: ||For the development of performance based design on a proper scientific basis
the use of the concept of risk is inevitable. However, the application of this
concept to actual structural design is not simple because of the large ranges
of probability and consequences of events which exist. This is compounded
by a plethora of different actions that can be taken to reduce the probabilities
of the events and also the magnitude of the consequences. It is the reduction
in the magnitude of these consequences which is essentially the goal of design.
This work aims to address the challenges posed by the application of the
concepts of performance based design for structures in fire. Simple methodologies have been developed for the assessment of the consequences of an
extreme event. These methodologies are based upon fundamental behaviour
of structures in fire.
A methodology has been developed which can be used to assess the capacity/deflection behaviour through the complete thermal deflection of floor
slabs. This takes into account positive effects on the capacity of floor slabs of
the membrane stress at the slabs boundaries at low deflections as well as the
final capacity provided by the tensile membrane action of the reinforcement
mesh at high deflections.
For vertical stability of structures in fire, analytical equations to describe
the behaviour of floor systems at the perimeter of a building are developed.
From these equations, the resulting pull-in forces on external columns can
be calculated as well as the resulting horizontal load applied to the column.
From this, a simple stability assessment is proposed which can be used to assess the consequences of multiple floor fires on tall buildings.
These analytical methodologies are brought together in a risk based frame-
work for structural design which can be used to identify areas in a building
or structural components which pose a high residual risk. These elements
can be qualitatively ’ranked’ according to their relative risk and appropriate
measures taken to reduce the risk to an acceptable level. The framework is
illustrated via 2 case studies. The first is of a typical small office building,
and the second is of a prestige office development.|
|Sponsor(s): ||Corus Group plc. and EPSRC|
|Appears in Collections:||BRE thesis and dissertation collection|
This item is licensed under a Creative Commons License
Items in ERA are protected by copyright, with all rights reserved, unless otherwise indicated.