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Study on seismic damage of high-rise structure with uncertain layout of interior floors

LUO Zhonghao;WU Yi;Vincent Lee;ZHANG Chunmei;CHEN Lin;WANG Hongwei;College of Civil Engineering,Guangzhou University;University of Southern California;  
To serve different needs of clients for space or duplex apartment,increasing storey height of high-rise buildings to let clients select duplex apartments or not has become fashionable. However,uncertain layout of interior floors may likely lead to high-rise buildings with vertical irregularity,and storey yield mechanism may form under strong earthquakes. The influences of uncertain layout of interior floors of apartments on the seismic performances of( super) high-rise buildings are needed to be further investigation. A common-used high-rise wall-frame structures considering nine different layouts of interior floors were selected,static and dynamic elastic-plastic analysis by adopting Perform 3D were carried out,capacity and stiffness based redundancy indexes,structural displacement,hysteretic energy and material damage under rareearthquakes were studied,and the effects of uncertain layout of in-terior floors on seismic performances of( super) high-rise building were extensively investigated. Results show that the most unfavorable situation is removing the interior floors in lower half of structure,which will cause 37. 72%more hysteretic energy and 6% ~ 16% lower redundancy with the most serious material damages in shear walls than original structure. It was suggested that with the wide application of such tall buildings,effects of uncertainties of layout of interior floors should be included in seismic design. The quantity of interior floors of the building can be removed should be less than 50% of all. The interior floors in lower half of structure should be strengthened.
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