BOX FRAME TYPE COMBINATION BEAM STRUCTURE

PROBLEM TO BE SOLVED: To improve spatial availability and design value by accomplishing a large span structure and eliminating a column type or a beam type and to reduce seismic power by making a building lightweight.SOLUTION: A box frame type combination beam structure is provided which comprises a reinforced concrete wall 2 and a composite beam 3 in which a plurality of beam steel frames 4 arrayed at intervals in a crossbeam row direction Y and a floor slab 5 are provided integrally. One-side end portions 4a and other-side end portions 4b of the plurality of beam steel frames 4 in the composite beam 3 are buried and connected, and a terminal reinforced concrete part 6 constituting a flat plate which extends along the crossbeam row direction Y is joined to the reinforced concrete wall 2.