earticle

영어

The use of steel braced frames as a retrofit method has been broadly used due to its effectiveness in terms of both light weight and short construction periods. However, the steel braced frame retrofit method is difficult to apply to the inner frames of buildings. Consequently, there have been demands for a braced frame retrofit method that can be broadly and easily applied to both inner and outer frames of buildings. In this study, a retrofit method of steel braced frames having Ductile Fiber Reinforced Cementitious Composites (DFRCCs) and steel bars at the mid-span of the steel brace member is proposed. Pre-fabricated upper and lower segments of the brace member are connected on-site with DPFRCCs, meaning that the proposed method is applicable to the inner frames of buildings as a seismic retrofit method with advantages of simple and rapid installation. The tension force is transmitted only through the steel bars and the compression force is transmitted by the prestressed bars to the DFRCCs of the joint which connect the three brace units. Results from cyclic tests of three specimens clearly showed that specimen with steel braces and suggested specimen using DFRCCs and steel bars ensure better strength and stable performance than pure RC frame. Improved construction efficiency can also be achieved with the proposed retrofit method.