TY - GEN
T1 - Comparisons of fire resistance of RC beams from different codes of practice
AU - Dwaikat, M. B.
AU - Kodur, V. K.R.
PY - 2008
Y1 - 2008
N2 - The fire resistance of reinforced concrete beams, computed as per three codes, namely, ACI 216.1, Eurocode 2, and AS 3600, is compared with that predicted from finite element analysis. A macroscopic finite element model, capable of tracing the behavior of restrained reinforced concrete beams from pre-fire stage to collapse, is used in the analysis. The model accounts for high temperature material properties, fire-induced strains (thermal, transient, and creep strains in addition to mechanical strain) and restraint effects as a result of fire exposure. Since restraint has a significant effect on fire resistance of reinforced concrete beams, the comparison is carried out for four cases of reinforced concrete beams with different boundary conditions. The first case represents a simply supported beam, while the other three cases represent axially restrained, rotationally restrained, and axially and rotationally restrained beams, respectively. Through the results of the case studies, it is shown that there is a large variation in the fire resistance predictions from the three codes, with Eurocode 2 being the most conservative and ACI 216.1 being the least conservative. It is also shown that the degree of axial restraint, rotational restraint, and type of failure criteria have significant influence on the fire resistance of reinforced concrete beams.
AB - The fire resistance of reinforced concrete beams, computed as per three codes, namely, ACI 216.1, Eurocode 2, and AS 3600, is compared with that predicted from finite element analysis. A macroscopic finite element model, capable of tracing the behavior of restrained reinforced concrete beams from pre-fire stage to collapse, is used in the analysis. The model accounts for high temperature material properties, fire-induced strains (thermal, transient, and creep strains in addition to mechanical strain) and restraint effects as a result of fire exposure. Since restraint has a significant effect on fire resistance of reinforced concrete beams, the comparison is carried out for four cases of reinforced concrete beams with different boundary conditions. The first case represents a simply supported beam, while the other three cases represent axially restrained, rotationally restrained, and axially and rotationally restrained beams, respectively. Through the results of the case studies, it is shown that there is a large variation in the fire resistance predictions from the three codes, with Eurocode 2 being the most conservative and ACI 216.1 being the least conservative. It is also shown that the degree of axial restraint, rotational restraint, and type of failure criteria have significant influence on the fire resistance of reinforced concrete beams.
KW - Design codes
KW - Fire resistance
KW - Fire resistance standards
KW - High temperature
KW - Reinforced concrete beams
KW - Restraint effect
UR - http://www.scopus.com/inward/record.url?scp=70349126342&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:70349126342
SN - 9781605607238
T3 - American Concrete Institute, ACI Special Publication
SP - 122
EP - 142
BT - American Concrete Institute - Designing Concrete Structures for Fire Safety Session at the ACI Spring Convention 2007
T2 - Designing Concrete Structures for Fire Safety - ACI Spring Convention 2007
Y2 - 22 April 2007 through 26 April 2007
ER -