A New method of seismic retrofitting for existing R/C
buildings is proposed by which energy dissipative braces
are attached to the building exterior. Followings are
results of the experiment; (1) The method shows better
damping effect. The torsional deformation at the beam
end has a large effect on the seismic performance. (2)
An effective factor for local torsional deformation is
specified by identifying failure mode at the beam end. An
evaluation formula for the connecting beam is verified
by the experimental result. Finally, prediction model the
required strength of the braces is proposed.
