Resilience-based design spectra for seismic design of school buildings in Mexico City

Contemporary communities increasingly rely on critical infrastructure, roads, telecommunication structures, and buildings. These infrastructures are essential for daily activities, particularly in post-disaster scenarios. Nevertheless, long post-earthquake downtimes and poor functionality can have a significant negative impact on urban areas and modern lifestyle. To address this, resilience-based seismic design aims to create structures that are less susceptible to disruption. However, currently there is no well-defined methodology to integrate resilience concepts with seismic design methods. This paper proposes an approach to obtain seismic demands that align with the principles of resilient infrastructure. The methodology involves a probabilistic study of seismic hazard, specifically, the magnitude exceedance rate definition. It also includes the examination of the structural response of a large family of single-degree-of-freedom oscillators, representing the behavior of multiple degree of freedom systems, subjected to dynamic seismic loads. From the statistical analysis of the results of these systems, the downtime, functionality loss, and resilience can be estimated, leading to the creation of design spectra. The proposed approach considers both structural and non-structural components, as well as factors that may delay post-earthquake repair activities. Design spectra are developed for reinforced concrete and steel buildings with typologies commonly found in Mexico City. The results showed that the spectral ordinates from resilience-based spectra often differ from those found in past and current Mexican codes. This finding highlights the need to create spectra tailored to specific building groups, allowing for better control of structural performance within a resilience context.