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This paper proposes a seismic retrofitting technique for exlsting R ／ C buildings by atIaching steel bracing frames しo the col − umns projected from the exterior walls of buildings ・ Two types ofthe experimental parameters were focussed in this paper ． One is the joint technique between 巳he retrofittin ． g steel columns ( beam )and the RIC celumn ( beam ) ． The other is whether or not to anchor the base ofthe steel columns to the foundations ofR 〆 C frames ． The cyclic lateral loads were applied tQ the model specimens ， which were about l13 the size ofRIC frames in schQol buildings under a constant axial load in the experlments ． The experiments and the analyses leaded the following conclusion ． The full lateral load carrying capacity was developed in an the speCimens regardless of the joint techniques be 【ween the steel frames and the R 〆 C frames ifthe bases ofthe steel frames were anchored Io the foundations Qf RIC frames ． However ， the RIC colurnns failed in shear ifthey were noI anchored 、

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