PRECAST REINFORCED CONCRETE COLUMN USING LAP SPRICES

Abstract

New construction methods have been developed to save labor and wood resources at construction sites and shorten construction periods of reinforced concrete buildings. The joint method is a type of lap splice, in which main bars are butted together at the midheight of the column and reinforced with small-diameter splint bars. These splint bars are contained in a precast concrete shell form (PCa-shell) for columns. The results of structural experiments on reinforced concrete members which have been designed by this method are explained in this paper. It appeared that the tie bars, which were installed in the PCa-shell, improved structural performance and that shear and flexural strengths were the same as with non-spliced PCa-shell members. Bond design methods for this joint type are further proposed.