TY - JOUR
T1 - Stochastic optimisation of buckling restrained braced frames under seismic loading
AU - Xu, Jiaqi
AU - Fermandois, Gaston A.
AU - Spencer, Billie F.
AU - Lu, Xilin
N1 - Funding Information:
The financial support of National Natural Science Foundation of China (NSFC) through the Major Research Plan (grant number 51638012) is gratefully acknowledged. The first author gratefully acknowledges the support of the China Scholarship Council to allow the first author to visit the University of Illinois at Urbana-Champaign. The second author gratefully acknowledges the financial support of CONICYT-Chile through the Becas Chile Scholarship No. 72140204, and Universidad Tecnica Federico Santa Maria (Valparaiso, Chile) through the Faculty Development Program Scholarship No. 208-13.
Funding Information:
This work was supported by the National Natural Science Foundation of China (NSFC) [grant number 51638012]; CONICYT-Chile through the Becas Chile Scholarship [number 72140204]; and Universidad Tecnica Federico Santa Maria (Valparaiso, Chile) through the Faculty Development Program Scholarship [number 208-13].
Publisher Copyright:
© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2018/10/3
Y1 - 2018/10/3
N2 - A stochastic optimisation procedure is proposed for the design of low- and mid-rise buckling restrained braced frames subject to seismic loading. The seismic excitation is represented as a zero-mean nonstationary filtered white noise. The Bouc–Wen model is chosen to represent the hysteretic behaviour of the buckling restrained braces. The equivalent linearisation method is employed to determine the second-order statistics of structural responses from the non-linear system. Three seismic intensity levels are considered in this study, which are associated to earthquakes with different probability of occurrence during the building’s lifecycle. It was observed that the optimal design that minimises the maximum ductility demand produces a more uniform distribution of energy dissipation and avoids soft-storey mechanisms; therefore, this design objective is considered to be a more reasonable optimisation objective for the design of buckling restrained braced frames. For higher rise structures, buckling restrained braces may experience over-dimensioning in the top stories, which means that dissipation will not occur. Thus, an upper bound constraint for the stiffness design of the buckling restrained braces is taken into account.
AB - A stochastic optimisation procedure is proposed for the design of low- and mid-rise buckling restrained braced frames subject to seismic loading. The seismic excitation is represented as a zero-mean nonstationary filtered white noise. The Bouc–Wen model is chosen to represent the hysteretic behaviour of the buckling restrained braces. The equivalent linearisation method is employed to determine the second-order statistics of structural responses from the non-linear system. Three seismic intensity levels are considered in this study, which are associated to earthquakes with different probability of occurrence during the building’s lifecycle. It was observed that the optimal design that minimises the maximum ductility demand produces a more uniform distribution of energy dissipation and avoids soft-storey mechanisms; therefore, this design objective is considered to be a more reasonable optimisation objective for the design of buckling restrained braced frames. For higher rise structures, buckling restrained braces may experience over-dimensioning in the top stories, which means that dissipation will not occur. Thus, an upper bound constraint for the stiffness design of the buckling restrained braces is taken into account.
KW - Structural optimisation
KW - buckling restrained braced frames
KW - hysteretic behaviour
KW - seismic response
KW - stochastic seismic loading
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U2 - 10.1080/15732479.2018.1443144
DO - 10.1080/15732479.2018.1443144
M3 - Article
AN - SCOPUS:85042932510
VL - 14
SP - 1386
EP - 1401
JO - Structure and Infrastructure Engineering
JF - Structure and Infrastructure Engineering
SN - 1573-2479
IS - 10
ER -