TY - JOUR
T1 - Simplified energy-based robustness assessment for steel-composite car parks under vehicle fire
AU - Fang, C.
AU - Izzuddin, B. A.
AU - Elghazouli, A. Y.
AU - Nethercot, D. A.
N1 - Funding Information:
The authors acknowledge the financial support of the Research Fund for Coal and Steel of the European Community within project ROBUSTFIRE: “Robustness of Car Parks against Localised Fire”, Grant No RFSR-CT-2008-00036. The related discussions and input of our collaborators from the University of Liège, University of Coimbra, CSTB, Greisch Ingénierie, and CTICM are gratefully acknowledged.
PY - 2013/4
Y1 - 2013/4
N2 - Due to a considerable number of reported car park fire accidents over the last few decades, robustness of these structures against localised fire is receiving increasing attention. Although a detailed analysis including fire modelling, heat-transfer analysis, and structural analysis may lead to a sound evaluation of structural robustness, it is too computationally demanding in practical design. In this respect, this paper proposes a simplified energy-based robustness assessment approach, namely, a Temperature-Independent Approach (TIA), in the sense that the maximum temperature is assumed to be unknown, thus adopting a similar basis to typical robustness provisions where event-independent local damage scenarios are employed. The new approach is inspired by the idea of 'sudden column loss' which is typically employed for blast loading, but is modified to enable its applicability to localised fire scenarios. Through considering degraded fire affected floor performance and energy balance during column buckling, the dynamic ductility demand after column buckling can be estimated from static ambient analysis. Through comparisons against the ductility supply, which is governed by the elasto-plastic joint response, the structural robustness can be assessed. Through comparisons with more sophisticated elevated temperature analysis, this simplified approach is shown to be both reliable and conservative.
AB - Due to a considerable number of reported car park fire accidents over the last few decades, robustness of these structures against localised fire is receiving increasing attention. Although a detailed analysis including fire modelling, heat-transfer analysis, and structural analysis may lead to a sound evaluation of structural robustness, it is too computationally demanding in practical design. In this respect, this paper proposes a simplified energy-based robustness assessment approach, namely, a Temperature-Independent Approach (TIA), in the sense that the maximum temperature is assumed to be unknown, thus adopting a similar basis to typical robustness provisions where event-independent local damage scenarios are employed. The new approach is inspired by the idea of 'sudden column loss' which is typically employed for blast loading, but is modified to enable its applicability to localised fire scenarios. Through considering degraded fire affected floor performance and energy balance during column buckling, the dynamic ductility demand after column buckling can be estimated from static ambient analysis. Through comparisons against the ductility supply, which is governed by the elasto-plastic joint response, the structural robustness can be assessed. Through comparisons with more sophisticated elevated temperature analysis, this simplified approach is shown to be both reliable and conservative.
KW - Design-oriented assessment
KW - Progressive collapse
KW - Robustness
KW - Steel-composite car parks
KW - Vehicle fire
UR - http://www.scopus.com/inward/record.url?scp=84873198735&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2012.12.036
DO - 10.1016/j.engstruct.2012.12.036
M3 - Journal article
AN - SCOPUS:84873198735
SN - 0141-0296
VL - 49
SP - 719
EP - 732
JO - Engineering Structures
JF - Engineering Structures
ER -