This technology is a floor slab structure and construction method for wall-structured apartment buildings. It involves securing steel beams between RC walls at predetermined locations of maximum deflection and around openings, then embedding these beams between the upper and lower reinforcement bars of the RC slab before pouring concrete.
In apartment buildings, heavy-weight floor impact noise is heavily dependent on the vibration characteristics of the slab itself, even when reinforced with cushioning materials or heavy-weight mortar. Increasing slab thickness leads to issues such as increased wall thickness, higher foundation material requirements, and height restrictions. Existing methods, such as adding frames or drop beams under the slab, are difficult to use in areas with insufficient height, such as recessed ceilings, or where walls are not present on all four sides. These methods also require additional slab drilling and have failed to provide quantitative evidence of noise reduction.
This technology determines the location of maximum deflection based on the length of a pair of masonry walls, the overall width and length of the wall structure, and eigenvalue analysis from numerical models. The steel beams are configured either as a single continuous unit or as a pair extending from both walls and meeting at the center. Additional pairs can be placed before and after the maximum deflection point or near openings, with beam widths determined by natural frequency and vibration scale. Applicable to new wall-structured apartment complexes, units with recessed living room ceilings, and designs meeting stricter floor noise standards, this method increases floor natural frequency by selectively enhancing stiffness without increasing slab thickness.
This invention was developed with support from the Ministry of Science and ICT’s University-Industry Linked Open-Lab Promotion Program for ICT Smart Convergence Components and Materials.
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