This technology is a building system that connects H-beam girders, equipped with end blocks at both sides, to PC columns featuring protruding compression blocks. The girder is mounted by inserting the compression block into the block slot at the bottom of the end block, then secured by a fastening device that passes through the neutral axis to tighten the column and girder together. Both the compression blocks and end blocks are made of UHPC.
While hybrid rigid-frame structures using concrete PC columns and steel H-beams are economical, they have historically faced challenges regarding complex joint structures, performance reliability, and construction difficulty. Furthermore, using a uniform H-beam cross-section across the entire span is inefficient, as the section is typically determined by end negative moments. Additionally, the lack of composite action between the H-beam and the cast-in-place slab concrete often leads to stress separation.
In this system, the UHPC compression block handles lower compressive forces, while the upper tensile forces are managed by a fastening device consisting of steel rods, anchor plates, and nuts passing through pipes in the column and end block. A pair of L-shaped steel stiffeners is placed on the top flange to reinforce the positive and negative moment sections, with concrete filled between them to integrate the beam with the slab through holes in the vertical side plates. Suitable for logistics centers, factories, parking structures, and office buildings, this method enables rigid connections via bolting without field welding, while reducing steel usage through end-section reinforcement.
This invention was developed with support from the Ministry of Science and ICT's AI-based Smart Mega-Structure Laboratory.
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