Abstract
In this study seismic performance of reinforced concrete staggered wall system structures were investigated and their behavior factors such as overstrength factors, ductility factors, and the response modification factors were evaluated from the overstrength and ductility factors. To this end, 5, 9, 15, and 25-story staggered wall system (SWS) structures were designed and were analyzed by nonlinear static and dynamic analyses to obtain their nonlinear force–displacement relationships. The response modification factors were computed based on the overstrength and the ductility capacities obtained from capacity envelopes. The analysis results showed that the 5- and 9-story SWS structures failed due to yielding of columns and walls located in the lower stories, whereas in the 15- and 25-story structures plastic hinges were more widely distributed throughout the stories. The computed response modification factors increased as the number of stories decreased, and the mean value turned out to be larger than the value specified in the design code.
Highlights
Reinforce concrete (RC) shear walls are key elements to resist both gravity and lateral loads in building structures, and the seismic performance and analysis modeling of RC shear wall structures have been widely investigated by many researchers (e.g., Wallace 2012)
The overstrength factors of the structures designed with medium-level seismic load turned out to be smaller than those of the structures designed with low-level seismic load
One of the main obstacles to be overcome for application of staggered wall systems is to ensure the seismic safety of the systems and to provide valid seismic design coefficients
Summary
Reinforce concrete (RC) shear walls are key elements to resist both gravity and lateral loads in building structures, and the seismic performance and analysis modeling of RC shear wall structures have been widely investigated by many researchers (e.g., Wallace 2012). In this regard the apartment buildings with vertical walls placed at alternate levels have advantage for their enhanced spatial flexibility Such a structural system has already been widely applied in steel residential buildings, which is typically called a staggered truss system. In this study the behavior factors such as overstrength factors, ductility factors, and the response modification factors of reinforced concrete staggered wall system (SWS) structures were evaluated following the procedure recommended in the ATC 19 (1995). To this end, 5, 9, 15, and 25-story SWS structural models were designed and were analyzed by nonlinear static and dynamic analyses to obtain their force–displacement relationship up to failure. The response modification factors were computed based on the overstrength and the ductility capacities obtained from the capacity envelopes
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