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Simplified, performance-based seismic evaluation of one-story and multistory irregular existing buildings with
rigid diaphragms, parallel framing systems, firm and regular foundations is introduced considering impulse
responses in addition to damage concentration responses using shear and torsion strength capacity ratios to the
corresponding linear shear forces and torsion moments in the x- and y-directions, respectively, in high seismic
urban areas. Maximum nonlinear story drift response of each story of buildings can be obtained based on the
shear and torsion strength capacity ratio, energy constant and return period concepts considering not only
positive slopes but also negative slopes of the skeleton curves in the yielding frames of structures. Allowable or
working stress design is not necessary in this method. However, effects of aftershocks are still uncertain. The
paper: RECOMMENDATIONS FOR SIMPLIFIED, PERFORMANCE-BASED SEISMIC DESIGN OF
BUILDINGS WITH IRREGULARITIES AND DESIGN EXAMPLES presented to 11th US-JAPAN workshop
at KOBE, Oct. 17-19, 2006 is much improved in this paper
05-01-0289.pdf
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