Abstract:
Buildings and other structures must be designed to perform satisfactorily to
withstand earthquake, provide safety to human lives, and to minimize the
economic losses from the damages, if any. Current code-prescriptive forcebased
design intends to provide strength and ductility to structures for life
safety, but actual performance is never assessed. Structures designed with a
code-based approach experienced extensive damage leading to enormous
economic loss and high repairing costs in the past earthquakes (e.g., 1994
Northridge and 1995 Kobe earthquake). With a view to enhancing safety and
reducing damage, i.e., emphasizing the performance of structures accelerated
the development of performance-based seismic design. This study aims at
designing reinforced concrete building frames following performance-based
earthquake engineering approach. An archetype eight storied RC building has
been selected and a frame has been analyzed and designed following the
seismic design approach of the BNBC 2020. Nonlinear time history analyses
using suitable earthquake ground motion records have been performed to
assess the performance of the code designed building frame. The selected
ground motions have been matched with acceleration response spectra of
required earthquake hazard levels to check the selected performance objectives.
Story drift, an indicator of damage, has been selected as an engineering demand
parameter to quantify performance. Then, the frame has been designed using
the performance based seismic design approach meeting the selected
performance objectives. Finally, the effects of base flexibility on the responses of
the building in force-based and performance-based design approaches have
also been assessed. The present study will help designers, owners, and
stakeholders to make intelligent decisions in designing new or strengthening
existing buildings to achieve the required performance of the structures.
