Evaluación del comportamiento sísmico y aceleraciones de piso en pórticos de acero resistentes a momento, bajo la asignación de distintos factores de importancia

Abstract

The research is based on the analysis of steel special moment frames (SMF); for this purpose, two models are defined with the implementation of the seismic response spectrum of the ASCE / SEI 7-16 standard, designed with importance factors (I) of 1.0 and 1.5. The study analyzes the behavior of non-structural components (CNEs) sensitive to floor accelerations, which are affected by the variation of seismic design forces. The analysis considers that an increase in the (I) value causes bigger steel sections of the structural system, modifying the dynamic behavior of the building that affects CNEs included in the study models. Damage to CNEs causes economic and material losses, as well as possible obstruction of escape routes during a seismic event. This study uses a base model to establish the geometry and design live loads, according to the SEAOC IBC document (2012). With the geometry established in each study model, service design criteria are performed implementing the considerations of the ASCE / SEI 7- 16 standard, which defines the required steel sections of structural elements. Resistance checking and capacity-based design of structural elements are verified through ANSI / AISC code. With verified models, the PFA and FRS method is applied for checking the behavior of CNEs present on each floor of the building. The research results establish that CNEs have a more critical behavior in the model designed with a bigger (I) value; since the increase of this parameter causes greater floor accelerations, being evident in those zones where the CNE period equals the period of one of the structure's vibration modes.