Evaluation of Behavior Factor Provision of ES EN for RC Ductile Regular and Plan Irregular Building Structures using Nonlinear Analysis
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Date
2018-11
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Addis Ababa University
Abstract
Most recent seismic codes include response modification factors (R in US practice) or
behavior factors (q in European practice) in the definition of equivalent lateral force method
of analysis used for the design of earthquake resistant buildings. Seismic design makes use
of energy absorption and dissipation to reduce the design forces in order to achieve economy.
The behavior factor (q) or response modification factors (R) plays a central role in seismic
design process, since it is used to reduce the linear elastic design spectrum to account for the
energy dissipation capacity of the structure. In this study the evaluation of behavior factor for
regular and irregular ductile reinforced concrete structures using nonlinear analysis is
investigated. The evaluation is done by designing regular and irregular structures for different
ductility classes with the provision of our seismic code and by checking their performance
through non-linear analysis using CSI ETABS. In this paper parametric studies have been
conducted and the effects of different parameters (seismic location, ground type, number of
stories, ductility class and 3D modelling effects) on behavior factor are presented in detail.
Moreover, the evaluation of behavior factor using different models under favorable and
unfavorable conditions along with performance comparison of structures designed for
different ductility classes were done and the results are discussed and presented in this study.
Furthermore, the evaluation of behavior factor for 3D plan irregular reinforced concrete
structure under unfavorable conditions is done using non-linear dynamic analysis and the
findings are presented as well.
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Keywords
Behavior factors, Ductility class