FORMED STEEL BEAM FOR STEEL-CONCRETE COMPOSITE BEAM AND SLAB

摘要

A built-up beam fabricated a plurality of profiled steel plates is disclosed. The built-up beam includes a first lower profiled steel plate including a bottom portion, a side-vertical portion bent upwardly and vertically from one lateral edge of the bottom portion, a supporting portion bent horizontally from an upper end of the side- vertical portion, and a first center- vertical portion bent vertically and upwardly from the other lateral edge of the bottom portion. A second lower profiled steel plate is arranged symmetrically about the first center- vertical portion of the first lower profiled steel plate and connected to the first lower profiled steel plate. The second lower profiled steel plate has a cross-section symmetrical or asymmetrical to the first lower profiled steel plate. The built-up beam includes a first upper profiled steel plate including a top face portion and a second center- vertical portion bent vertically and downwardly from one lateral edge of the top face portion, the first upper profiled steel plate being connected to one upper side of the first center- vertical portion of the first lower profiled steel plate. A second upper profiled steel plate is arranged symmetrically about the second center- vertical portion of the first upper profiled steel plate and connected to the other upper side of the first center- vertical portion of the second lower profiled steel plate. The second upper profiled steel plate has a cross-section symmetrical or asymmetrical to the first upper profiled steel plate. Thus, a slab can be placed within the depth to thereby reduce the story height.