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Integration of Structural Engineering into Fire Engineering Design LEUNG Siu-man Chief Structural Engineer Buildings Department. Building (Construction) Regulation 90 – Fire Resisting Construction. Every building shall be designed and constructed so as to –
LEUNG Siu-manChief Structural EngineerBuildings Department
Every building shall be designed and constructed so as to –
In other words, every building shall be designed and constructed so
as to provide adequate resistance to spread of fireand smoke and
to maintain its stability.
Practice Note for AP & RSE 204 issued in 1998 :
Active Fire Services Installation
Passive Fire Design
Fire Safety Management System
Total Fire Safety in Buildings
Fire hazard chart
Three dominant criteria to ensure that the fire resistant compartment is maintained so as to allow sufficient time for safe evacuation and rescue operation – The “Fire Resistance Period” concept
The 3m high concrete compartment partition wall, which is
constructed of d=100mm thick and restrained both at the top by a
fire protected steel beam and the bottom by the concrete floor slab,
is subjected to a natural fire condition with the fire exposed wall
surface at a temperature T0 higher than the fire unexposed wall
restraints, the restrained bow (or lateral thermal displacement) yR 
2 HT0 gap
For T0 = 900 C ; = 9.0 x 10-6 /C; E = 20,000 N/mm2
H = 3000mm ; the gap at the top of compartment wall = 10mm
yR = 132mm
The restraint stress R
E ( T0 gap )
R = 95 MPa
(i.e. which is much greater than the crushing strength of partition wall of 20 MPa)
 O’Connor D J, Structural Engineering design for fire safety in buildings. The Structural Engineer/ Volume 73/ No. 4, 21 February 1995
The forces taken by each steel rod at fire limit state calculated by using a finite element program SAFE, the structural capacities of steel rods at ambient temperature provided by the manufactures, the calculated load ratio of the steel rods, and the respective limiting temperatures derived by interpolation of Table 1 are as follow:
The platform is supported by hanger rods which can
only take tensile loads. Excessive relative elongation
of individual rods heated up under fire may render
these affected rods losing their supporting action (i.e.
no longer in tension). This will cause a load
redistribution and increase the load on the other
remaining hanger rods jeopardizing their original fire
limit state designed for.
(a) The selected fire cases should be critically reviewed to ascertain if they generally
cover the worst scenario.
(b) The derivation of the fire load should be conversant with the local condition rather
than simply refer to overseas fire load data.
Q & A