Redundancy Factors for the Seismic Design of Ductile Reinforced Concrete Chevron Braced Frames

Abstract

In this paper the authors summarize the results of a study devoted to assess, using nonlinear static analyses, the impact of increasing the structural redundancy in ductile moment-resisting reinforced concrete concentric braced frames structures (RC-MRCBFs). Among the studied variables were the number of stories and the number of bays. Results obtained were compared with the currently proposed values in the Manual of Civil Structures (MOC-08), a model code of Mexico. The studied frames have 4, 8, 12 and 16-story with a story height h=3.5 m. and a fixed length L=12 m., where 1, 2, 3 or 4 bays have to be located. RC-MRCBFs were assumed to be located in soft soil conditions in Mexico City and were designed using a capacity design methodology adapted to general requirements of the seismic, reinforced concrete and steel guidelines of Mexican Codes. From the results obtained in this study it is possible to conclude that a different effect is observed in overstrength redundancy factors respect to ductility redundancy factors due to an increase of the bay number considered. Also, the structural redundancy factors obtained for this particular structural system varies respect to the currently proposed in MOC-08.

Linear and Nonlinear Dynamic Analysis of Reinforced Concrete Building with V Shape Steel Bracing

“…In the previous research Godínez and Tena, 2010 and 2016 [3], [4]; Godínez et al, 2012 [5], they were focused on pushover and dynamic analysis of RC/MRCBFs using the chevron SB and applied MFDC-04 codes. Eskandari R. et al (2017) investigated the diagonal steel bracing in concrete frame structure and analysis based on the Iranian Seismic Design Code.…”