A composite open web beam-joist includes a cambered beam-joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam-joist portion. The plate includes a distal end having a flange and a recess.

A composite open web beam-joist includes a cambered beam-joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam-joist portion. The plate includes a distal end having a flange and a recess.

A composite open web beam joist includes a cambered beam joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam joist portion. The plate includes a distal end having a flange and a recess.

A composite open web beam joist includes a cambered beam joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam joist portion. The plate includes a distal end having a flange and a recess.

A composite open web beam joist includes a cambered beam joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam joist portion. The plate includes a distal end having a flange and a recess.

A composite open web beam joist includes a cambered beam joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam joist portion. The plate includes a distal end having a flange and a recess.

Provided is a flanged member that has a tubular shape and includes a flange portion, the flanged member including: a cross-section changing portion of which a cross-sectional shape changes along an axial direction of the flanged member, in which in any two cross-sections in the cross-section changing portion, a perimeter of one cross-section is 1.25 times or less a perimeter of the other cross-section.

The present invention relates to a method for forming a reinforcement structure, and the reinforcement structure. The method for forming a reinforcement structure according to the present invention may include: a first forming step of bending an edge of a steel plate in a first direction to form a side flange, which forms a flange angle with the bottom surface of the steel plate; a second forming step of bending the steel plate in a second direction to form a pair of side wall flanges, and bending at least a portion of the side flange in a direction opposite the first direction; and a third forming step of bending the side flange in the first direction.

The present invention relates to a method for forming a reinforcement structure, and the reinforcement structure. The method for forming a reinforcement structure according to the present invention may include: a first forming step of bending an edge of a steel plate in a first direction to form a side flange, which forms a flange angle with the bottom surface of the steel plate; a second forming step of bending the steel plate in a second direction to form a pair of side wall flanges, and bending at least a portion of the side flange in a direction opposite the first direction; and a third forming step of bending the side flange in the first direction.

Provided are a body frame member capable of suppressing deformation due to springback, and a method for manufacturing the same. The body frame member 1 of the present invention is formed in a substantially U shape by a web 2 extending in a front-rear direction of a vehicle body, an upper flange 3 extending inward in a vehicle width direction from an upper end of the web 2 and a lower flange 4 extending inward in the vehicle width direction from a lower end of the web 2, and comprises a kick-up portion 5 bent in the vertical direction of the vehicle body, and a convex portion 21 protruding outward or inward in the vehicle width direction is integrally formed from the upper end to the lower end of the web 2 at a portion of the web 2 where the kick-up portion 5 is provided.