Método alternativo de diseño sismo-resistente con espectros de periodo de retorno bajo, para edificios de 20 pisos.

Abstract

A comparison is made between two types of design, which is made based on an earthquake with an assigned return period. For the first, a 20-story building is modeled and analyzed based on the guidelines of the NEC (2015) for an earthquake (Tr = 475 years), following the design details for special frames provided by the ACI (2019). For the second, it is proposed to design and analyze the building based on the level of forces corresponding to the service earthquake (Tr = 43 years), without a response modification factor "R". Both designs follow the details for special frames given by the ACI (2019) and following the guidelines of the NEC (2015) for adequate seismic performance, establishing for the proposed method to limit drifts to 0.5%. Once the analysis and design of both methodologies has been carried out, the performance of the structures is evaluated using the opensees software following the provisions of ASCE 41-13 for different levels of expected threats, comparing the structural behavior between both designs. As a final step, quantities of steel and concrete used in both designs are calculated to see the feasibility of the proposed method in relation to the conventional one commonly used. Finally, it was found that the proposed design is not feasible due to the excessive cost of the structure. However, in terms of comparison with seismic protection systems, it results in a fairer comparison, since it is a structure that would have an expected performance very similar to a protected structure, structurally speaking.