Estimación del riesgo en edificaciones por deslizamientos causados por lluvias y sismos en la ciudad de Medellín, empleando herramientas de la Geomática

Abstract

This article presents a risN estimation in buildings by landslides triggered by earth- quaNes and rainfall in the city of Medellin using a Geographic Information System (GIS). For this, a computer model that considers topographic, geological, geotech- nical and hydrological characteristics of the study area was implemented to deter- mine landslide hazard by evaluating the stability of slopes using pseudo static NewmarN Method, including a probabilistic approach technique based on the first order and second moment —FOSM. The approach for the assessment of physical vulnerability of buildings in the study area was conducted through structural fragili- ty indexes that consider the definition of the level of damage to buildings through event trees using a cadastral inventory data of the municipality of Medellin. The routine calculates the probability of a landslide to occur given that an earthquaNe produces a horizontal ground acceleration (Ah), considering the uncertainty of the geotechnical parameters and the conditions of soil saturation for the effect of previ- ous rainfall in the area, then multiply such values with the structural fragility index- es values in order to estimate the damage indices of buildings, which are associated with the risN when considering the relevant economic variable to the replacement value of such structures from assessed values.