the supporting beam 16 must be sized to resist the weight of the steel deck 14 the weight of the concrete 15 and the imposed construction load during the concreting operation in the buildup composite beam design of this invention the supporting beam 16 is required only to resist the weight of the steel deck without the weight of concrete while the combined strength of the supporting beam 16 and the t beam 17 is available to resist the total load during erection therefore the combined size of the supporting beam 16 and the t beam 17 is equivalent to a single supporting beam of the studded composite beam design it becomes apparent that a saving in the ceiling height equaling the height of the t beam 17 is achieved by this invention since the entire t beam 17 is buried within the depth of the floor slab for a highrise building the saving in the ceiling height of each floor will result in a significant reduction of building height segments of the t beams 17 can be strategically located at the regions of high bending moment rather than covering the entire length of the supporting beam 16 2 in a studded composite beam design the resistance against slab buckling relies on the enlarged stud head to hold down the concrete slab in the buildup composite beam design of this invention the floor slab is continuously locked under the long extended top flange 21 of the t beam 17 therefore significant improvement in the hold down capability is achieved allowing the development of high strain in the concrete slab without composite failure the common problem of longitudinal concrete cracks on top of a studded composite beam is eliminated by this invention 3.