Resilient seismic design of steel frames with hysteretic fuses in a code-oriented format

Mexico City during and after the September 19, 2017 earthquake: Assessment of seismic resilience and ongoing recovery process

“…In the particular case of Mexico City, considering also the large extent of damage observed in buildings designed with collapse-prevention codes when subjected to spectral accelerations below those assumed in their design (1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004) codes, e.g. [28], it is clear to the authors that to improve seismic resilience in the future: (a) it should be mandatory to use resilient-based concepts for the seismic retrofit and upgrading of existing structures (damaged or apparently undamaged), (b) new buildings should be designed using resilient-based design procedures (e.g., [26] and performance-based procedures directed to achieve operational performance objectives, (c) city authorities should start working in developing, publishing and promoting the use of a new resilient-based seismic design code in the near future, (d) the role of local city authorities (each one of Mexico City´s political and administrative Districts) would be crucial in enforcing and assuring an acceptable minimum of resilience in the construction of new structures and the retrofitting of new ones, and e) coordinated programs for the structural health monitoring of typical representative buildings for the city (including old, retrofit and new buildings) should be implemented and the gathered information used to detect and correct potential structural deficiencies on time before the next strong earthquake may strike. In addition, complementary detailed vulnerability studies should be done to screen and prioritize the types of building construction and sectors of the city which should be attended first to improve their seismic resilience with well-planned, programmed retrofit, strengthen or replacement projects (midterm and long-term coordinated projects), where information gathered in structural health monitoring of buildings is of paramount importance.…”

“…In this section, the authors want to do the following reflections: (a) how resilient was the built environment in Mexico City before the September 19, 2017 earthquake?, (b) so far, how has been the seismic recovery process of the built environment in Mexico City after the earthquake and, (c) how could the seismic resilience of the built environment be improved before the next strong earthquake strikes Mexico City? As resilience may have different definitions depending on the focus of interest, the authors would discuss it in terms of definitions more related to structural systems from the earthquake engineering viewpoint [4,7,26]. Mexico City is an old city with a large inventory of structures (buildings and houses or dwellings) with the following characteristics and shortcomings [25,27,28].…”

Optimization and Effectiveness of The Placement of Energy Dissipators In Rc Frame Structures 

“…Across the world, several buildings have been equipped with this class of device, experiencing strong seismic demands and performing satisfactorily; for example, the Titanium Building (La Portada) in Santiago, Chile, behaved properly under the Maule earthquake of 8.8 degrees in 2010. In Chile, due to its great seismicity, there have been previous investigations on the use of energy dissipators (Bin 1995;Ou and Wu 2001;Tena-Colunga and Hernández-Ramírez 2020).…”