Evaluación comparativa del grado de vulnerabilidad sísmica entre la NEC 24 y ASCE 7- 22 de la estructura metálica del centro comercial Ferroviario de la ciudad de Ambato

Abstract

Ambato is located in a geographical region with a high risk of seismic activity, which represents a danger to its inhabitants; this research focused on estimating the probability of damage from the consultancy received by the Municipality of Ambato for the construction of the Railway Commercial Center of the city of Ambato using the time-history analysis method by obtaining collapse fragility curves from the generation of IDA curves, in addition, the structure was subjected to 3 site seismic records, each with its 2 pairs of records duly scaled and corrected. This investigation required adherence to the guidelines of ASCE 7-22, FEMA, and NEC 2024. The model analysis defined the following: Conservatism in seismic engineering is primarily measured by a standard's ability to minimize the probability of collapse (CP) and life-threatening damage (LS). In this case, the NEC 24 proposal estimates significantly higher probabilities for these limiting performance levels, particularly in the north-south direction. This implies that the NEC 24 proposal is more stringent or cautious in its assessment, considering the greater risk of severe structural damage. A total of 271 nonlinear time-history dynamic simulations were performed. The high frequency of earthquakes in Ecuador necessitates the development of more advanced structural analyses for a more accurate assessment of building behavior. This research promotes the application of collapse fragility curves as a more precise alternative for implementing preventative measures to reduce human and economic losses.