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Seunguk Na,Inkwan Paik,Sung-ho Yun,Huu Chi Truong,Young-Sook Roh 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.2
Multi-unit dwellings, such as apartment housing, town houses, and flats, are some of the most common housing types in Korea, as well as in other countries. Such multi-unit dwellings are considered an effective means to overcome the housing problems of high-density population in urban areas, owing to their high efficiency of land utilisation. However, interlayer noise complaints, such as footsteps or dragging items in apartment housing, are an inevitable problem in apartment dwelling conditions, because each household in an apartment shares walls and ceilings with other households. This paper presents the results acquired from the field test of the floor impact sound insulation performance of a voided slab system as applied to a commercial residential-complex building in South Korea. The results have shown that adopting the voided slab system for a commercial residential-complex building increased floor impact sound insulation performance. The test results show that the sound insulation performance of the voided slab system applied in the building for lightweight and heavyweight floor impact sound reached (47 and 41) dB, respectively. Based on the results of the field tests, it is expected that the application of the voided slab systems to the slabs of the apartment dwellings would be effective, and offer outstanding sound insulation performance. Moreover, it is expected that the floor impact sound insulation performance would be further improved, if the floor finishing materials, such as carpet or other types of flooring material, would first be installed onto the floor.
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임종진,조승호,백인관,엄태성,이인오,한주연,Lim. Jongjin,Cho. Seungho,Paik. Inkwan,Um. Taesung,Lee. Inoh,Han. Juyeon 한국방재학회 2013 한국방재학회논문집 Vol.13 No.6
판형태 중공재를 사용한 중공슬래브는 중공에 의해 자중을 절감시킬 수 있어 제작 및 운송비용을 줄일 수 있다. 하지만 큰 중공률 때문에 전단저항성능이 감소될 수 있고, 중공재를 기준으로 슬래브의 상 하부 플랜지 콘크리트의 일체성에 취약할 수 있다. 본 연구에서는 판형 중공재를 사용하는 중공슬래브의 전단파괴모드와 전단강도에 대하여 연구하였다. 12개의 전단 실험체에 2점 가력을 수행하였다. 실험 변수는 중공률, 중공재 수직 위치, 수직철근(다월철근)의 설치여부 이다. 실험결과 슬래브 하부에 휨균열이 발생한 직후, 웨브 콘크리트의 상 하에서 수평균열이 발생하여 강성이 크게 저하되었다. 중공률 32.5% 이상의 슬래브 실험체는 웨브 콘크리트 수평균열로 인하여 최종파괴 되었지만, 중공률 28.9% 미만의 실험체는 일반 보에서 흔히 관찰되는 웨브 콘크리트의 대각전단파괴가 발생하였다. 중공슬래브 웨브 콘크리트의 최대 수평전단응력은 중공률이 32.5%에서 41.4%로 증가함에 따라 0.26 <TEX>$\sqrt{f_{ck}}$</TEX>에서 0.51 <TEX>$\sqrt{f_{ck}}$</TEX>로 증가하였다. 또한 수평균열과 직각으로 배근된 수직철근은 슬래브의 전단강도를 강화시켰다. Due to less weight (i.e. greater void ratio), voided concrete slabs with board-type voiding materials take advantages of easier fabrication and less transportation cost. However the shear resistance can be decreased due to the greater void ratio(or the poor integrity between concrete plates at the top and bottom of the voiding material). In the present study, the shear resistance and failure mode of the voided slabs with board-type voiding material were investigated. Two-point loading shear tests were performed for 12 slab specimens. Test parameters were the void ratio, the location of the voids, and the presence of reinforcing vertical bar (or dowel bar). Test results showed that premature horizontal cracking developed at the top and bottom of the web concrete, shortly after flexural cracking at the bottom of the slabs. The slab specimens with void ratios greater than 32.5% were ultimately showed the horizontal shear failure of the web concrete, while the specimens with the void ratios less than 28.9% showed the conventional diagonal shear failure. The maximum horizontal shear stresses of concrete at failure, increased 0.26 <TEX>$\sqrt{f_{ck}}$</TEX> to 0.51 <TEX>$\sqrt{f_{ck}}$</TEX> as the void ratio increased from 32.5 % to 41.4 %. The vertical bars of the web which were perpendicular to the horizontal cracks of the web concrete, enhanced the shear strength of the slabs.
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