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A platform for research: civil engineering, architecture and urbanism
Comparison of the Seismic Performance of Steel Moment-Resisting Frames and Moment-Resisting Knee Braced Frames
Ductile steel moment-resisting frame (MRF) structures offer an ideal solution to resist seismic loads in high seismic regions due to their reliable yielding mechanism and architectural versatility. Despite their large ductility capacity under seismic loading, lower lateral stiffness and prohibitively complex beam-to-column connections have been the motivations to use knee braces with the intension of bracing the storeys while beams are moment-connected to beam stubs. This paper aims to compare and contrast the seismic response of conventional Type D (Ductile) MRFs and new moment-resisting knee braced frames (MRKBFs). The lateral load-resisting system of a five-storey office building located in Vancouver, Canada was designed once using MRFs and then using MRKBFs. A numerical model of both frames accounting for material and geometric nonlinearities was then developed. The frames were analysed under gravity and seismic loads. The results obtained from the design and numerical analyses of the frames were used to evaluate the economy and seismic response, including lateral stiffness, drift demands and load-carrying capacity, of the selected frames. The results suggest that although a higher lateral stiffness can be expected from MRKBFs compared to MRFs, additional connections required in MRKBFs can negatively affect the cost-efficiency of MRKBFs over MRFs.
Comparison of the Seismic Performance of Steel Moment-Resisting Frames and Moment-Resisting Knee Braced Frames
Ductile steel moment-resisting frame (MRF) structures offer an ideal solution to resist seismic loads in high seismic regions due to their reliable yielding mechanism and architectural versatility. Despite their large ductility capacity under seismic loading, lower lateral stiffness and prohibitively complex beam-to-column connections have been the motivations to use knee braces with the intension of bracing the storeys while beams are moment-connected to beam stubs. This paper aims to compare and contrast the seismic response of conventional Type D (Ductile) MRFs and new moment-resisting knee braced frames (MRKBFs). The lateral load-resisting system of a five-storey office building located in Vancouver, Canada was designed once using MRFs and then using MRKBFs. A numerical model of both frames accounting for material and geometric nonlinearities was then developed. The frames were analysed under gravity and seismic loads. The results obtained from the design and numerical analyses of the frames were used to evaluate the economy and seismic response, including lateral stiffness, drift demands and load-carrying capacity, of the selected frames. The results suggest that although a higher lateral stiffness can be expected from MRKBFs compared to MRFs, additional connections required in MRKBFs can negatively affect the cost-efficiency of MRKBFs over MRFs.
Comparison of the Seismic Performance of Steel Moment-Resisting Frames and Moment-Resisting Knee Braced Frames
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / el Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Mokhtari, Mahdi (author) / Islam, Abrar (author) / Imanpour, Ali (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 25 ; 265-270
2022-05-18
6 pages
Article/Chapter (Book)
Electronic Resource
English
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