• 한국구조물진단유지관리공학회 논문집
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• 제24권1호
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• pp.8-15
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• 2020

이 논문에서는 최근 사회적인 이슈로 대두된 바닥충격음 중 특히 중량충격음을 저감시키기 위한 방법의 일환으로, 바닥슬래브의 두께를 증가시키는 기존의 방식과는 달리 평판형 슬래브에 장선을 설치하여 바닥슬래브의 강성을 증가시킴으로써 고유진동수의 이동을 통한 중량충격음의 저감 효과를 기대할 수 있는 장선바닥슬래브를 제안하고, 장선의 춤과 간격에 따른 중량충격음 특성을 해석적으로 분석하였다. 해석결과, 장선슬래브의 슬래브 두께가 증가할수록 음압레벨이 감소하는 경향을 나타내었으나 일정 두께 이상에서는 큰 차이를 보이지 않아 바닥두께 증가로 인한 중량충격음 차단 기대효과에는 임계치가 있을 것으로 판단된다. 또한 장선 춤의 증가와 간격 감소에 따른 바닥강성의 증가는 일관된 중량충격음 차단성능의 증가로 이어지지 않아 최적의 중량충격음 차단성능을 기대하기 위해서는 주택의 유형별로 각기 다른 장선 춤과 간격이 적용되어야 할 것으로 판단되며, 100mm 정도 장선 춤의 증가나 간격 감소로 약 1dB~2dB정도의 중량충격음 감소효과를 얻을 수 있을 것으로 기대된다.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2006년도 추계학술발표대회 논문집
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• pp.208-211
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• 2006

This study was to find out contemporary planning trends of rural houses in Na-po Munhwa village by analyzing their floor plan shapes and space relations & elements. There were built 240 houses in that village, but it were possible to collect housing data, floor plans & general building records of 120 houses, from house register. By analyzing those data, findings were as follows : 1) Floor plan shapes of rural houses had a tendency to 'ㅋ' shape type than simple box or transformed box types, and Room-Living-Room arrangement of centered living were very strong trends in those plans. 2) Public spaces, L.D.K

• 토지주택연구
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• 제5권2호
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• pp.81-89
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• 2014

이 논문에서는 최근 관심을 모으고 있는 강재프레임 모듈러주택의 건식 바닥시스템을 대상으로 바닥충격음 차단성능을 확보하기 위하여 시도된 다양한 바닥구조의 실험결과에 대하여 제시하고 있다. 실험결과, 단위모듈 건식온돌 바닥구조는 완충구조로서 액체몰을 사용한 바닥구조 D31(D32)를 사용하는 조건에서 경량충격음의 경우 주택건설기준 등에 관한 규정에서 정하고 있는 바닥충격음 차단성능의 1등급 수준의 확보가 가능하고, 중량충격음의 경우는 바닥충격음 차단성능의 최저등급이기는 하나 기본적인 성능의 확보가 가능한 것으로 평가되었다.

• 한국소음진동공학회논문집
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• 제21권9호
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• pp.805-812
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• 2011

This study investigated the characteristics of heavy-weight floor impact sounds of box-frame type structure using 1:10 scale model. Ten types of floor structures(bare slabs and floating floors) were evaluated in terms of dynamic stiffness and loss factor. Floor vibrations and radiated sounds generated by simulated impact source were also measured. The results showed that the bakelite was appropriate for simulating concrete slab in the 1:10 scale model, and surface velocity and sound pressure level of concrete slab measured from the scale model showed similar tendencies with the results from in-situ in frequency domain. It was also found that dynamic behaviors of layered floor structures in the 1:10 scale model were similar to those in a real scale. Therefore, the use of 1:10 scale model would be useful for evaluating the heavy-weight floor impact sound insulation of layered floor structures when the frequency-dependent dynamic properties of each material are known.

• 한국소음진동공학회논문집
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• 제24권9호
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• pp.731-740
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• 2014

Occupants induced floor vertical vibrations may cause other occupant's annoyance and lead to social loss. To help control such floor vibrations, several criteria have been developed mostly based on human perception tests and floor vibration tests. Floor vibration is evaluated by comparison with criteria and vibration parameters of subject floor, such as frequency, damping ratio, acceleration value, vibration duration time and occurrence frequency. Three acceleration value parameters are used in criteria; peak acceleration, rms acceleration and VDV, when a floor vibration serviceability is evaluated. Meanwhile rms acceleration and peak acceleration are adopted as vibration limit value in criteria and researches of human perception for vibration. Occupants induced floor vibration is transient rather than steady state. However, rms acceleration is not reliable parameter for evaluating transient vibration. The objective of this study is to investigate the characters of human perception level according to acceleration value parameters for vibration induced by heel impacts and walking activities.

• Geomechanics and Engineering
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• 제14권5호
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• pp.429-437
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• 2018

In order to reduce deformation of roadway floor heave in deep underground soft rockmass, four support design patterns were analyzed using the Fast Lagrangian Analysis of Continua (FLAC)3D, including the traditional bolting (Design 1), the bolting with the backbreak in floor (Design 2), the full anchorage bolting with the backbreak in floor (Design 3) and the full anchorage bolting with the bolt-grouting backbreak in floor (Design 4). Results show that the design pattern 4, the full anchorage bolting with the bolt-grouting backbreak in floor, was the best one to reduce the deformation and failure of the roadway, the floor deformation was reduced at 88.38% than the design 1, and these parameters, maximum vertical stress, maximum horizontal displacement and maximum horizontal stress, were greater than 1.69%, 5.96% and 9.97%. However, it was perfectly acceptable with the floor heave results. The optimized design pattern 4 provided a meaningful and reliable support for the roadway in deep underground coal mine.

• 한국조경학회지
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• 제35권3호
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• pp.62-70
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• 2007

The purpose of this research is to suggest an improved method of how to apply and operate an average floor height system to rebuilt or redeveloped apartment buildings in general residential areas of Seoul. This research suggested two research findings by a computer simulation study for analyzing the difference between the average floor height of apartment buildings in experimental sites and the average of floors of buildings near experimental sites. The first finding is that an average floor height system should be applied to apartment buildings with a limitation of maximum height at sites larger than $12,000m^2$ in order to control the difference of the maximum height of buildings between apartment sites and their surroundings. The second finding is that the average floor height system should be operated by an appropriate average floor height ratio at sites greater than $50,000m^2$ in order to harmonize rebuilt or redeveloped apartment buildings with their surroundings.

• 한국주거학회논문집
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• 제16권5호
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• pp.91-98
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• 2005

The purpose of this study is to analysis of propagation characteristics for floor impact noise in attendance upon investigating standard of insulation performance, measurement and evaluation, understanding characteristics of a measuring factor for floor impact noise in apartment houses. Four cases which was before occupied apartment in Daegu was selected for experiment. Floor impact noise of measurement and evaluation method which are specified in the Korea Standard 2810-1, 2810-2, 2863-1 and 2863-2 was selected for this study. As the result of this study, 1) Especially, there is not a difference for apartment size, but the apartment of 40py type is lower than 30py's about $1\~2\;dB$ for light-weighted and heavy weighted impact sound. 2) The floor impact sound insulation performance is similar about measurement location of the same floor structure. 3) The floor impact sound insulation performance is not a difference about the slab area.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2008년 추계학술발표대회 논문집
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• pp.278-283
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• 2008

This paper aims to clarify physical characteristic of empty house and vacant floor in historic district on Cheongju. First, most empty houses are the timbered houses of 1 story, and it will be built before the 1969. And the building of a vacant floor has a common non-residential buildings of 4 stories, and there are many buildings of RC structure built in the 1980s. Second, when the situation of an empty house and a vacant floor was seen, there was most the second floor only by the number of room, but when seen from the ratio of the whole number of rooms, there were most the third floor and the fourth floor. Third, when the situation of a vacant floor and a vacant room was seen from use, there were most store, shop and office. Relevance with this as close as reduction of the population in the center of Cheongju is seen. Moreover, the grope of a method which can utilize this is required.

• Structural Engineering and Mechanics
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• 제47권6호
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• pp.791-818
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• 2013

The seismic performance of reinforced concrete (RC) frame structures with irregularities leading to soft first floor is studied using capacity assessment procedures. The soft first story effect is investigated for the cases: (i) slab-column connections without beams at the first floor, (ii) tall first story height and (iii) pilotis type building (open ground story). The effects of the first floor irregularity on the RC frame structure performance stages at global and local level (limit states) are investigated. Assessment based on the Capacity Spectrum Method (ATC-40) and on the Coefficient Method (FEMA 356) is also examined. Results in terms of failure modes, capacity curves, interstory drifts, ductility requirements and infills behaviour are presented. From the results it can be deduced that the global capacity of the structures is decreased due to the considered first floor morphology irregularities in comparison to the capacities of the regular structure. An increase of the demands for interstory drift is observed at the first floor level due to the considered irregularities while the open ground floor structure (pilotis type) led to even higher values of interstory drift demands at the first story. In the cases of tall first story and slab-column connections without beams soft-story mechanisms have also been observed at the first floor. Rotational criteria (EC8-part3) showed that the structure with slab-column connections without beams exhibited the most critical response.