Construcción de curvas de fragilidad al colapso del Parqueadero del Mercado Central de Ambato

Abstract

Ambato is located in a geographical region with a high risk of seismic activity, which represents a danger for its inhabitants; this research focused on the estimation of the probability of damage of the Ambato Central Market parking lot using the time-history analysis method by obtaining collapse fragility curves from the generation of IDA curves, in addition, the structure was subjected to 7 site seismic records, each one with its 2 pairs of records duly scaled and corrected. In this research it was necessary to follow the guidelines of ASCE 41-17, FEMA and NEC 2015. In the model analysis it was visualized: torsional distortion and absence of non-precalibrated connections. The results showed that the analyzed structure reached the immediate occupancy level (IO) and did not reach the life safety level (LS) since the structure collapsed. It was determined that the parking lot is more vulnerable in the Y direction presenting the following damage probabilities: 24.67 percent with no damage to the structure, 38.10 percent at an IO level and 37.23 percent at a Total Collapse in an Occasional seismic event with maximum spectral acceleration of 0. 85 g; for a Rare seismic event the following probabilities were evidenced: 0.78 percent with no damage to the structure, 14.64 percent at an IO level and 84.57 percent for Total Collapse at maximum spectral acceleration of 1.19 g. A total of 271 nonlinear time-history dynamic simulations were performed. The high frequency of earthquakes in Ecuador requires the development of more advanced structural analyses for a more accurate evaluation of the behavior of buildings. This research promotes the application of collapse fragility curves as a more accurate alternative to take preventive measures to reduce human and economic losses.