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Earthquake-resisting design is almost most important in design
for building structures.At present,although the technique of
building structures is progressive ,unsureness of earthquake
often makes static and dynamic propertyof real structures
different with outset,and the difference may has influenceon
safety of structures.System identification may improve this
situation.It canhelp us to analyze the dynamic property of real
structures,and estimate the reliability of structures. In this
paper,a common transfer function model--ARX model,is used in
systemidentification in discrete-time domain.We take three steel
frame buildings inTaipei basin--Tai-Power Building(27F),Hsin-
Kwon Building(50F) and Bai-ShihBuilding(30F) that have seismic
records to analyze their natural frequency,damping ratio,mode
shape,storey drift,base shear and overturning moment,theseare
very useful in earthquake-resisting design.We can also compare
our analysiswith nowaday codes.
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