Building steel tensile strength test device and test method

The invention discloses a building steel tensile strength test device and a test method. According to the technical scheme, the building steel tensile strength test device is characterized in that the building steel tensile strength test device comprises two tensile seats, and the distance between the two tensile seats can be relatively adjusted in a sliding mode; coaxial supporting cylinders are arranged on the two stretching seats; one end of the supporting cylinder is fixedly connected with the stretching base, the other end of the supporting cylinder is suspended, through holes are formed in the axis position of the supporting cylinder, and the inner peripheries of the two through holes are of conical structures and gradually expand towards the opposite sides; the clamping device further comprises a clamping sleeve set used for clamping the steel strand, the clamping sleeve set comprises a plurality of fan-shaped ring pieces which are annularly and evenly distributed, the inner circumference of the fan-sh