Análisis y diseño sismo resistente de edificios de acero con marcos a momento, considerando columnas cruciformes y tubulares huecas

Abstract

This document details the design and analysis based on the seismic performance of four steel structures. Two structural systems are proposed, each with 3-story and 6- story models. Two of them will be special moment frames (SMF) with cruciform columns and the other two will be intermediate moment frames (IMF) with tubular columns. The study starts with a Modal-Spectral Seismic Analysis based on the provisions established in the NEC-SE-DS/AC/CG and AISC 360/341-16 standards. Followed by a Nonlinear Static Pushover Analysis, making use of the recommendations given by ASCE 41-13 and FEMA 356. In order to determine the performance point of the structures, through the application of two methods: the capacity spectrum method (ATC-40, FEMA 440); and the coefficient method (FEMA 440, ASCE 41-13). As a check, a nonlinear dynamic analysis (Time-History) was performed with a synthetic seismic record compatible with the Seismic Demand Spectrum, to ensure that the performance points obtained by the nonlinear static analysis do not differ from each other. The research made use of SAP2000 commercial software to develop the mentioned analysis methods. In addition, the procedures to be followed in the program can be evidenced by means of screenshots. Finally, the evaluation of the seismic performance of the modeled structures is presented, according to the performance objectives recommended by the ATC40 and the NEC-SE-DS.