Analysis of the Reinforcement of a Steel Structure With Concentric Diagonals. Manta UVC Case

The Pedernales earthquake in 2016 affected several structures, an example is the UVC in the city of Manta, in which a post-earthquake reinforcement with inverted V-shaped diagonals was performed. This paper presents an analysis of the structure without reinforcement and with longitudinal reinforcement, using functions of the CEINCI-LAB Computational System to determine displacements, drifts, and floor shear, in a seismic analysis with the spectral and static equivalent modal method using the spectrum of Manta 2016. In addition, the demand is determined according to the NEC-15 load combinations, using the live, dead and earthquake load states; for the verification of the axial capacity of columns, the effect of the earthquake is used, considering the over-resistance. After that, a design by capacity is carried out in the structure without reinforcement, based on the capacity of the beams, and in the case of reinforcement, an analysis is carried out based on the capacity of the diagonals. It is observed that both the original structure and the reinforcement do not comply with the earthquake resistant philosophy, and it is likely that an earthquake will be affected in a future.