The present document explains the evaluation of the seismic safety of an internally reinforced masonry dwelling through the probabilistic approach of Fragility Functions. A very commonly structural plan for a two-story family dwelling was chosen as the target structure. For modeling the non-linear properties of the structure, a comparison was made between the Takeda Slip model and the Takeda Standard model to experimental results of a structural testing of masonry walls, conducted in the Large Structures Laboratory of Universidad Centro Americana “José Simeón Cañas”. The variable for selecting the best fitting model was the equivalent viscous damping. For predicting the skeleton curve of the masonry walls of the structure two approaches were taken. First, a set of empirical equations were proposed for predicting the elastic, post-cracking and post yielding stiffness and cracking, yielding and ultimate strength of masonry walls. The equations area a function of the inverse of the aspect ratio and the percentage of steel in the gross sectional area of a wall. Those equations were compared with the elastic stiffness obtained by following Tomaževič (1999), the equations used by Kikuchi and Kuroki (2017) for the rest of the aforementioned stiffness parameters and finally, the equations proposed by Matsumura (1988) for the cracking and ultimate strength of the walls. The fragility curves obtained by those methods were compared and finally the most appropriate was chosen to evaluate the seismic safety of the target structure. The expected damage was evaluated for the maximum acceleration level indicated in the Salvadoran Seismic Design Code (NTDS) and the maximum recorded PGA in El Salvador (October 10, 1986 San Salvador Earthquake).
Keywords: Equivalent Viscous Damping, Fragility Functions, Reinforced masonry, Takeda Model, Takeda-Slip Model