Double steel pipe structural member

摘要: A double steel pipe structural member comprises an external and internal pipe. The is provided with a thin part thick parts formed at each of the ends part. thickness 1.5 to 1.7 times disposed so as overlap not only but behaves bending resistant against that may deform plastically in longitudinal direction thereof after axial compressive force exceeds yield strength deformation axially symmetrical along outer surface truss structure including pipe, prevented from immediately collapsing when building having encounters big earthquake or like.