Abstract
Concentrically braced frame is an effective and prevalent seismic force resisting system which is commonly used in low-rise buildings. This type of structural system utilizes steel braces to provide the stiffness and strength needed to dissipate earthquake energy. Several bracing configurations have been proposed in different building codes worldwide. These codes provide detailed design requirements for the structural members and connections, but no guidance is provided in selecting the best bracing configuration for the design. In this study, the impact of the bracing configuration on the seismic response of a five-story prototype office building located in Vancouver, Canada, is systematically examined. Five different bracing configurations were designed according to the National Building Code of Canada and CSA S16 standard. Detailed structural responses, initial costs, and life cycle costs of the prototype building with five different bracing configurations were systematically compared. The results show that the different bracing configurations play an important role in sizing the structural members, which impacts the initial material usage and the overall life cycle cost of the building.
Highlights
Steel concentrically braced frame (CBF) is a seismic force resisting system (SFRS) commonly used in seismic zones around the world
The results show that the different bracing configurations play an important role in sizing the structural members, which impacts the initial material usage and the overall life cycle cost of the building
The moderate ductile concentrically braced frame (MD-CBF) is targeted to be used in high seismic zones, where the SFRS is designed to have enhanced ductility through yielding of the steel braces, while the beams and columns are capacity designed to resist the maximum load produced by the braces
Summary
Steel concentrically braced frame (CBF) is a seismic force resisting system (SFRS) commonly used in seismic zones around the world. To prevent the structure from losing total stiffness, the Abbreviations: CBF, Concentrically Braced Frame; SFRS, Seismic Force Resisting System; MD-CBF, Moderate Ductile Concentrically Braced Frame; LD-CBF, Limited Ductile Concentrically Braced Frame; I-VBF, Inverted V-braced Frame; VBF, V-braced Frame; XBF, X-braced Frame; M-XBF, Multistory-X-braced Frame; SZBF, Suspended Zipper Braced Frame; ISD, Peak Inter Story Drift ratio; FA, peak Floor Acceleration; Std, Standard Deviations; PBEE, Performance-Based Earthquake Engineering; EDP, Engineering Demand Parameter; DS, Damage State; PG, Performance Group; Min_Qty, Minimum Quantities; Max_Qty, Maximum Quantities; MAL, Mean Annualized Loss. To quantify the seismic performance of the prototype building with different bracing configurations, the performance-based earthquake engineering (PBEE) method developed by Yang et al (2009a) was used.
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