TY - JOUR
T1 - Concentric tubular steel braces subjected to seismic loading
T2 - Finite element modeling
AU - Haddad, Madhar
N1 - Funding Information:
The study was made possible by financial support of the Individual Research Grant ( Seed-AE-2012/G00001044 ) of the UAE University . Many thanks to Professor Tom Brown and Brad Shaback, University of Calgary, for providing the experimental data.
Publisher Copyright:
© 2014 Elsevier Ltd. All rights reserved.
PY - 2015/1
Y1 - 2015/1
N2 - Steel buildings are susceptible to damage during earthquakes if an unreliable bracing system is used. A well-designed and detailed concentric bracing system is needed for steel buildings in a seismically active area. Failure of a concentric bracing member occurs at the mid-length plastic hinge. A refined finite element model has been developed to simulate the hysteresis behavior of bracing members under cyclic loading including fracture. The model provides similar hysteresis behavior to previous (Shaback and Brown [1]) and two new experiments (Tremblay et al. [2]). The specimens were subjected to different loading protocols. It was found that an initial imperfection affects the pre-buckling and first buckling cycles but has no effect on the following cycles. The greater the initial yield stress of the HSS, the earlier is the occurrence of local buckling. The cumulative plastic strain is greater at the outer surface than at the inner surface of the compressive corners/web of the mid-length plastic hinge where fracture initiates. Significant local rotation follows the same trend as the significant plastic strain of the same element where fracture initiates.
AB - Steel buildings are susceptible to damage during earthquakes if an unreliable bracing system is used. A well-designed and detailed concentric bracing system is needed for steel buildings in a seismically active area. Failure of a concentric bracing member occurs at the mid-length plastic hinge. A refined finite element model has been developed to simulate the hysteresis behavior of bracing members under cyclic loading including fracture. The model provides similar hysteresis behavior to previous (Shaback and Brown [1]) and two new experiments (Tremblay et al. [2]). The specimens were subjected to different loading protocols. It was found that an initial imperfection affects the pre-buckling and first buckling cycles but has no effect on the following cycles. The greater the initial yield stress of the HSS, the earlier is the occurrence of local buckling. The cumulative plastic strain is greater at the outer surface than at the inner surface of the compressive corners/web of the mid-length plastic hinge where fracture initiates. Significant local rotation follows the same trend as the significant plastic strain of the same element where fracture initiates.
KW - Concentric tabular steel braces
KW - Cumulative plastic strain
KW - Cyclic behavior
KW - Finite element model
KW - Fracture
KW - Ultra-low-cycle fatigue
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U2 - 10.1016/j.jcsr.2014.10.013
DO - 10.1016/j.jcsr.2014.10.013
M3 - Article
AN - SCOPUS:84908388807
SN - 0143-974X
VL - 104
SP - 155
EP - 166
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
ER -