Abstract
This paper reports about experimental results carried out in order to obtain data about yield rigidity of concrete member reinforced with strands which have higher tensile strength and lower bond strength with concrete than usual deformed bars. The following things was made clear, 1) bond failure occurs easily as shear span ratio become smaller, 2) yield rigidity become smaller as shear span ratio become smaller, 3) bond between strands and concrete of specimens whose shear span ratio are more than 3.5 works effectively. And in case of specimens whose shear span ratio are 4.5, yield rigidity is almost equal to calculated value by the way of calculating it which distance from neutral axis and strain in a cross section are in proportion, and calculating method of yield rigidity of concrete member reinforced with strands is supposed.
