Structural Engineering and Mechanics

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Response transformation factors and hysteretic energy distribution of reinforced concrete braced frames

  • Herian A. Leyva (Facultad de Ingenieria, Arquitectura y Diseno, Universidad Autonoma de Baja California) ;
  • Eden Bojorquez (Facultad de Ingenieria, Universidad Autonoma de Sinaloa) ;
  • Juan Bojorquez (Facultad de Ingenieria, Universidad Autonoma de Sinaloa) ;
  • Alfredo Reyes (Facultad de Ingenieria, Universidad Autonoma de Sinaloa) ;
  • Fabrizio Mollaioli (Department of Structural and Geotechnical Engineering, Sapienza University of Rome) ;
  • Omar Payan (Department of Mechanical and Mechatronic Engineering, Tecnologico Nacional de Mexico Campus Culiacan) ;
  • Leonardo Palemon (Departamento de Ingenieria Civil, Universidad Autonoma del Carmen) ;
  • Manual A. Barraza (Facultad de Ingenieria, Arquitectura y Diseno, Universidad Autonoma de Baja California)
  • Received : 2023.01.17
  • Accepted : 2024.04.19
  • Published : 2024.05.10
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Abstract

Most of existing buildings in Mexico City are made of reinforced concrete (RC), however, it has been shown that they are very susceptible to narrow-band long duration ground motions. In recent years, the use of dual systems composed by Buckling Restrained Braces (BRB) has increased due to its high energy dissipation capacity under reversible cyclical loads. Therefore, in this work the behavior of RC buildings with BRB is studied in order to know their performance, specifically, the energy distribution through height and response transformation factors between the RC and simplified systems are estimated. For this propose, seven RC buildings with different heights were designed according to the Mexico City Seismic Design Provisions (MCSDP), in addition, equivalent single degree of freedom (SDOF) systems were obtained. Incremental dynamic analyses on the buildings under 30 narrow-band ground motions in order to compute the relationship between normalized hysteretic energy, maximum inter-story drift and roof displacement demands were performed. The results shown that the entire structural frames participate in energy dissipation and their distribution is independent of the global ductility. The results let propose energy distribution equations through height. Finally, response transformation factors between the SDOF and multi degree of freedom (MDOF) systems were developed aimed to propose a new energy-based approach of BRB reinforced concrete buildings.

Keywords

Acknowledgement

This research was developed thanks to the economic support provided by the Consejo Nacional de Humanidades, Ciencia y Tecnologia (CONAHCYT) in Mexico, under Grant Ciencia de Frontera CF-2023-G-1636 and Ciencia Basica 287103 and for the scholarship given to the postPhD researcher. The financial support given by the Universidad Autonoma de Sinaloa under grant PROFAPI 2022 and PRODEP-SEP under project UABC-PTC-806 also are appreciated.

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