A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Re-examination of steel frame office buildings in preventing collapse when subject to intense fires
The purpose of the paper is to investigate the extent to which present-day design of steel framed buildings is susceptible to total collapse when subjected to extreme fire events. We select a 50 storey structure in which 2 and 4 adjacent storeys located at different above-ground heights are, in separate scenarios engulfed in raging fires. A total of 8 scenarios are analyzed, employing Newtonian mechanics and realistic energy dissipating properties of H-shaped columns and normal concrete floor slabs possessing secondary (shrinkage and temperature) reinforcement alone. While the present Canadian building code is the basis for our column designs, other standards provide very similar specifications. Although fire proofing is required in virtually all high rise building construction, we are excluding such materials in order to simplify the analyses, but clearly do not advocate its omission – quite the opposite in fact. As well, attributes such as floor beams, partitions and furnishings of every description, all of which would in practice participate in absorbing the kinetic energy of a crush-down upper block are excluded. Despite such a vast array of conservative assumptions, it is shown that partial collapse may occur during crush-down, however, in no case will total collapse be the consequence. These results should provide some comfort to code writers that their requirements should indeed prevent the most catastrophic of failures due to fires.
Re-examination of steel frame office buildings in preventing collapse when subject to intense fires
The purpose of the paper is to investigate the extent to which present-day design of steel framed buildings is susceptible to total collapse when subjected to extreme fire events. We select a 50 storey structure in which 2 and 4 adjacent storeys located at different above-ground heights are, in separate scenarios engulfed in raging fires. A total of 8 scenarios are analyzed, employing Newtonian mechanics and realistic energy dissipating properties of H-shaped columns and normal concrete floor slabs possessing secondary (shrinkage and temperature) reinforcement alone. While the present Canadian building code is the basis for our column designs, other standards provide very similar specifications. Although fire proofing is required in virtually all high rise building construction, we are excluding such materials in order to simplify the analyses, but clearly do not advocate its omission – quite the opposite in fact. As well, attributes such as floor beams, partitions and furnishings of every description, all of which would in practice participate in absorbing the kinetic energy of a crush-down upper block are excluded. Despite such a vast array of conservative assumptions, it is shown that partial collapse may occur during crush-down, however, in no case will total collapse be the consequence. These results should provide some comfort to code writers that their requirements should indeed prevent the most catastrophic of failures due to fires.
Re-examination of steel frame office buildings in preventing collapse when subject to intense fires
Korol, Robert Mathews (author) / Sivakumaran, Ken S. (author) / Heerema, Paul (author) / McMaster University
2018-09-04
doi:10.20528/cjsmec.2018.03.001
Challenge Journal of Structural Mechanics; Vol 4, No 3 (2018); 82-88 ; 2149-8024
Article (Journal)
Electronic Resource
English
DDC:
690
Severity of fires in steel-frame buildings
| Engineering Index Backfile | 1967
Collapse Resistance Mechanisms in Steel Frame Buildings
| British Library Conference Proceedings | 2013
Collapse Resistance Mechanisms in Steel Frame Buildings
| ASCE | 2013
Progressive Collapse of Moment Resisting Steel Frame Buildings
| British Library Conference Proceedings | 2005
Seismic collapse prevention system for steel-frame buildings
| British Library Online Contents | 2016