The present invention relates to a built-up of steel beams and relates to a composite beam with the deck plate, the deck plate is coupled in more detail in the form suspended in the built-up steel beams can reduce the story height composite beam.
According to a preferred embodiment of the invention, the floor member, with an abutment, one end extends perpendicular to the web portion and the web portion one end perpendicularly extending upper flange portion at the junction to be bonded to the bottom member to the top surface of the bottom member to each other built-up steel beams are combined at a distance consisting of the U-shaped member of a pair of concrete to form a receiving space therein; A plurality of fixing members that are coupled such that a predetermined length is protruded in a perpendicular direction to the width at regular intervals in a longitudinal direction on the upper flange of the built-up steel beam length direction; It has a bottom surface and, extending from the both ends in the width direction of the bottom surface 2 side, and the cross-sectional shape consists of an extension connected to an end on one side open to the respective side end of the floor to the protruded portions of the fixing member a plurality of deck plate that is surface-mounted installation is hanging on both sides in a width direction perpendicular to the longitudinal direction of the built-up steel beams connected to each other by a connection end portion over the entire length of the assembled steel beam; And a composite beam by the beam-assembled steel consisting of U-shaped member is provided inside of the built-up of steel beams and the deck is poured on top of the plate and comprises a concrete to form the beam and the slab as those in Synthesis integrally.