The present invention focuses on the fact that the value of the bending moment varies depending on the fixed state of the end of the building, so that it naturally adapts to the structural stresses. Part of the conventional H-beam (Confucius, 2) with uniform end and center cross sections is provided. This invention relates to a Wanggongja (王 工 字, 1) beam to which a T-beam (or a cross-section T-beam) is attached. If the beam subjected to the uniform load is rigidly welded to the column, the fixed end bending moment at the end is twice the center bending moment, and in the simple support, the center bending moment is maximum while the end value is zero. The reciprocating beam is a kind of sectional material, and the beam is placed in the horizontal direction on the symmetrical beam without T-shaped steel (or lateral surface T-shaped steel) to be a continuous beam. In other words, the concrete slab is constructed by placing the deck plate 7 on the beam 5 to use the space of the beam height provided between the Confucius beam and the upper slab in the Y-direction duct pipe and the X-direction duct from the bottom of the beam to the ceiling. Can be piped.;In addition, if the concrete slab is constructed by placing a deep deck plate (7) or a high iron truss directly on the Confucius beam (H-beam) of Wanggongbo instead of the beam (5), the upper T-beam (or section T-beam) The deck plate or steel truss can be placed 50mm above the height of the deck plate or steel truss to place the deck plate or steel truss on top of the center of the Wanggongbo, that is, under the T-beam (or cross-section T-beam) of the royal beam, and then install the slab concrete. .
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