Modelación elasto-plástica y análisis no lineal de una estructura especial de acero utilizando OpenSees

Abstract

The need for structures to resist seismic events, to preserve the safety of their occupants, has been highlighted by historic and recent earthquakes. For the seismic analysis, is proposed the analysis of performance of a structure with steel moment frames, whose geometry and loading conditions are given by the FEMA P-695 document. The structure is modeled using the OpenSees software as a concentrated plasticity model with the capacity to form elasto-plastic hinges and is validated by comparing it with a more detailed model that includes degradation, achieving similar period, overstrength and ductility results. The analysis is performed at three levels of performance and its behavior is verified according to the limits of maximum drifts given by FEMA 356. At the levels of design and prevention of collapse MCE an adequate performance is obtained, although too close to the limits; while at the service level the acceptability criteria are not met, causing a negative response from the structure. Within the different analyzes, the influence of P-Delta effects and axial reduction in columns on the response of the system is studied, determining that its inclusion within the model is essential since they generate considerable changes in it. Finally, this project is aimed at studying the influence of modeling on the performance of structural and non-structural components at different levels of seismic risk.