Energy-Based Design of Buckling-Restrained Steel Braced Frames for Concurrent Occurrences of Earthquake and Wind

This paper describes the development of a dual hazard spectrum for use in the dynamic analysis of steel frames subject to the combined effects of earthquakes and wind. The proposed spectrum is obtained by combining the power spectra of earthquakes and wind using the square root of the sum of squares...

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Bibliographic Details
Published in:CivilEng 2024-06, Vol.5 (2), p.343-377
Main Authors: Shan, Taonian, Lui, Eric M.
Format: Article
Language:English
Subjects:
Bracing
Buckling
buckling-restrained brace design
Buildings
Concrete
Design
dual hazard spectrum
Earthquakes
earthquake–wind dual hazards
Energy dissipation
Fast Fourier transformations
High rise buildings
Power spectra
Reinforced concrete
Steel frames
time-history analysis
Wind
Wind effects
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Summary:This paper describes the development of a dual hazard spectrum for use in the dynamic analysis of steel frames subject to the combined effects of earthquakes and wind. The proposed spectrum is obtained by combining the power spectra of earthquakes and wind using the square root of the sum of squares (SRSS) combination method. An equivalent time excitation function is then computed using an inverse fast Fourier transform (IFFT) and serves as input for the dynamic analysis. Using time-history analysis on the OpenSees platform, the dynamic responses expressed in terms of peak and residual inter-story and roof drifts for two multistory steel frames located in two US cities (Los Angeles and Charleston) are obtained to demonstrate that designing these buildings based on just one hazard may not be adequate. For frames that are considered under-designed, an energy-based design procedure that uses buckling-restrained braces (BRBs) to dissipate the excess energy imparted to these frames is proposed so they will satisfy the FEMA 356 recommended drift limits for the performance levels of immediate occupancy and life safety.
ISSN:2673-4109
2673-4109
DOI:10.3390/civileng5020018