The purpose of this paper is to clarify the rigid zone lengths for reinforced concrete members. The rigid zone lengths were calculated from the results of finite element analysis of column -beam connections. The equations to estimate a rigid zone lengths were derived to utilize those rigid zone lengths. The estimated rigid zone lengths were applied to three spans，1-9 stories reinforced concrete frames，and those frames were analized by stiffness method. The results of the analysis were very much in agreement with the results of finite elementanalysis of those frames.
水平力を受ける鉄筋コンクリートラーメン架構の剛域に関する研究
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