Dynamic Response of Concentrically Braced Steel Frames to Pulse Period in Near-Fault Ground Motions

Authors : Zeliha TONYALI, Muhammet YURDAKUL, Hasan SESLİ

Pages : 357-373

Doi:10.55525/tjst.1113021

View : 15 | Download : 9

Publication Date : 2022-09-30

Article Type : Research Paper

Abstract :Steel braced frame systems insert ignore into journalissuearticles values(SBFs); having high stiffness and high strength are commonly utilized due to their resistance to lateral seismic forces in regions with high seismicity. In this study, concentrically braced frames insert ignore into journalissuearticles values(CBFs); having different bracing configurations are used to obtain the significance of the pulse period associated with near-fault insert ignore into journalissuearticles values(NF); ground motion by time-history dynamic analysis. Besides, far-fault insert ignore into journalissuearticles values(FF); ground motions are also used to compare with NF ground motion results according to chancing bracing configurations. To achieve dynamic responses of steel frames with different concentric bracings under NF ground motions, which especially have small, medium, and long pulse periods, 3-story and 4-span CBFs having different bracing configurations were selected as an example. 4 FF and 12 NF ground motions having different pulse durations were chosen to evaluate the dynamic response of concentrically braced frames. The results showed that peak ground acceleration insert ignore into journalissuearticles values(PGA); could be identified as a key parameter that controls the response of braced frames under FF ground motions. In addition, the ratio of the pulse duration to the first mode period is the dominant parameter when this ratio is only greater than 1.0 under the NF ground motions.
Keywords : Dynamic response, pulse period, near fault, concentric bracing, steel frames