Thesis.
Autors: Celi C.
Buildings based on structural frame systems are predominant in our country's cities. Typically, these structural systems are calculated using a linear analysis of the resistant system, primarily drawing on the theoretical strengths of the materials that constitute the system. However, this linear analysis, which is regulated by linear displacements and extrapolated to inelastic displacements through factors accounting for the structure's ductility, has its limitations. Although this linear method has demonstrated satisfactory outcomes, its constraints necessitated the exploration of alternative analysis methods in this thesis. Two methods were adopted for the Nonlinear Static Analysis (NSP): the assumed plastic zones method and the fibers method. These analyses offer a more comprehensive understanding of the building's state during seismic events. In a frame comprising 4 spans and 5 stories, 200 combinations were tested for the plastic zones method and 90 for the fibers method. These combinations are tailored to how each method interprets the primary properties of materials and the structural configuration involved in the non-linearity of energy dissipation mechanisms. The criteria, proposed by various scholars, regarding the representation of materials used to describe the structural system are outlined.For the fibers method, combinations based on the frame of 4 spans and 5 stories were assessed, considering the contributions from flexure, shear, and strain penetration. Regarding the plastic zones method, the modeling procedure for the structure's basic combinations is delineated. A manual analysis, drawing from ATC40 [4] and ASPD [3] recommendations, was briefly undertaken to derive the structure's capacity curve. The statistical foundation was built upon specific calculation routines and processes developed for this thesis, and the tendencies of the statistical results for both methods (plastic and fiber zones) were analyzed. In conclusion, a comparative study between the two methods was conducted, highlighting the performance point of the structure for each model.