bachelorThesis
Evaluación del comportamiento sísmico y aceleraciones de piso en pórticos de acero resistentes a momento, bajo la asignación de distintos factores de importancia
Fecha
2021-03-11Autor
Cepeda Loja, Jhon Marcelo
Vintimilla Ulloa, Jorge Eduardo
Institución
Resumen
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.