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<p>This study evaluates the structural reliability and seismic performance of reinforced concrete buildings with two different lateral load-resisting systems: (1) conventional moment-resisting frames (MRF) and (2) dual systems combining MRF with buckling-restrained braces (BRB). Both structures are assumed to be located on soft soil deposits within the lake-bed zone of Mexico City. Nonlinear dynamic analyses were performed using a suite of ground motion records representative of the local seismic hazard. The reliability assessment included the development of fragility curves and the estimation of the mean annual frequency of exceedance for key engineering demand parameters. Furthermore, the seismic performance of the building models was quantified in terms of expected economic losses using the methodology included in FEMA P-58. Results demonstrate that the incorporation of BRB significantly enhances structural reliability and reduces expected annual losses compared to the conventional MRF system. Specifically, the dual MRF–BRB building exhibited an Expected Annual Loss (EAL) of 0.43% of its Total Replacement Cost (TRC), approximately 60% lower than that of the MRF building (1.07% of TRC). These findings highlight the potential of BRB as an effective energy dissipation system for improving the seismic resilience and economic efficiency of buildings located in high-seismicity regions such as Mexico City.</p>

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Structural reliability and expected economic losses in reinforced concrete dual MRF-BRB buildings

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Federico Valenzuela-Beltrán,
  • Alfredo Félix-Soto,
  • Mario D. Llanes-Tizoc,
  • Edmundo Amaya,
  • Indira Inzunza,
  • Alfredo Reyes-Salazar

摘要

This study evaluates the structural reliability and seismic performance of reinforced concrete buildings with two different lateral load-resisting systems: (1) conventional moment-resisting frames (MRF) and (2) dual systems combining MRF with buckling-restrained braces (BRB). Both structures are assumed to be located on soft soil deposits within the lake-bed zone of Mexico City. Nonlinear dynamic analyses were performed using a suite of ground motion records representative of the local seismic hazard. The reliability assessment included the development of fragility curves and the estimation of the mean annual frequency of exceedance for key engineering demand parameters. Furthermore, the seismic performance of the building models was quantified in terms of expected economic losses using the methodology included in FEMA P-58. Results demonstrate that the incorporation of BRB significantly enhances structural reliability and reduces expected annual losses compared to the conventional MRF system. Specifically, the dual MRF–BRB building exhibited an Expected Annual Loss (EAL) of 0.43% of its Total Replacement Cost (TRC), approximately 60% lower than that of the MRF building (1.07% of TRC). These findings highlight the potential of BRB as an effective energy dissipation system for improving the seismic resilience and economic efficiency of buildings located in high-seismicity regions such as Mexico City.