관통형과 단부형 필로티 천장부의 피크풍압계수 특성 분석

유장열,김근호,채명진,김영문,유기표,You, Jang-Youl,Kim, Geun-Ho,Chae, Myung-Jin,Kim, Young-Moon,You, Ki-Pyo 한국공간구조학회 2018 한국공간구조학회지 Vol.18 No.2

Various pilotis are installed in the lower part of high rise buildings. Strong winds can generate sudden airflow around the pilotis, which can cause unexpected internal airflow changes and may cause damage to the exterior of the piloti ceiling. The present study investigates the characteristics of peak wind pressure coefficient for the design of piloti ceiling exteriors by conducting wind pressure tests on high rise buildings equipped with penetration-type and end-type pilotis in urban and suburban areas. The minimum peak wind pressure coefficient for penetration-type piloti ceilings ranges from -2.0 to -3.3. Minimum peak wind pressure coefficient in urban areas was 30% larger than in suburban areas. In end-type piloti ceilings, maximum peak wind-pressure coefficient ranges from 0.5 to 1.9, and minimum peak wind-pressure coefficient ranges from -1.3 to -3.6. With changes in building height, peak wind pressure coefficient decreases as the aspect ratio increases. Peak wind-pressure coefficient increases with taller pilotis. On the other hand, when piloti height decreases, the absolute value of the minimum peak wind pressure coefficient increases.

쌍곡선포물선 대공간 구조물의 측벽개구율에 따른 지붕의 풍압특성

유장열,유기표,You, Jang-Youl,You, Ki-Pyo 한국공간구조학회 2013 한국공간구조학회지 Vol.13 No.1

There can be diverse causes in the destruction of a large space structure by strong wind such as characteristics of construction materials and changes in internal and external wind pressure of the structure. To evaluate the wind pressure of roof against the large space structure, wind pressure experiment is performed. However, in this wind pressure experiment, peak internal pressure coefficient is set according to the opening of the roof in Korea wind code. In this article, it was tried to identify the change of internal pressure coefficient and the characteristics of wind pressure coefficient acting on the roof by two kinds of opening on the side of the structure with Hyperbolic Paraboloid Spatial Structures roof. When analyzing internal pressure coefficient according to roof shape, it was found that minimum (52%) and maximum (30%~80%) overestimation was made comparing to partial opening type proposed in the current wind load. It is judged that evaluation according to the opening rate of the structure should be made to evaluate the internal pressure coefficient according to load.

도로시설물(암거) 설치에 따른 주변 기류흐름특성 분석

유장열(You, Jang-Youl),백선영(Paek, Sun-Young),유기표(You, Ki-Pyo),김영문(Kim, Young-Moon) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.12

The start of the freeway era in Korea has led to a dramatic increase in the demand for road traffic between cities, and the following damages have been emerging. Examples include sunshine and ventilation disturbance emerging from the construction of roads, bridges, and tunnels which have led to crop damages. The ventilation disturbance damages due to the wind resulting from freeway facilities (noise barrier, road embankment) are continuously on the increase. Accordingly, the purpose of this study is to use an culvert to research methods which can promote wind movements which have been modified from road mounding, perform wind tunnel test from different wind speed, compare changes in the overall air current conditions following the number and form of culvert, and discover the ventilation effects which promote smooth wind flow.

형상변화에 따른 고층건물의 풍응답 평가

유장열(You, Jang-Youl),유기표(You, Gi-Pyo),김영문(Kim, Young-Moon) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.7

High-rise buildings constructed in large cities are thin and long in their shape, and are both unconventional and light-weight. As the height of the building increases, it obtains more flexibility and less damping ratio. In case of dynamic loads such as wind load and earthquake load, high-rise buildings are extremely disadvantaged. They are very sensitive to dynamic loads and experience vibration response. In some cases, resonance my cause damages and destruction of structures. In addition, vibrations resulting from dynamic loads may also inflict severe problems for the safety of residents or the serviceability safety of the building. Since acceleration response from wind load is the cause of problems in serviceability safety. The purpose of this study is to reduce the wind vibration response of high-rise buildings(unconventional) under the influence of wind load. Therefore, as a means to change the external shape of high-rise buildings, the flat Y-type form generally applied in domestic high-rise buildings was selected for examination. Wind tunnel tests will be conducted on 12 high-rise buildings, composed of three different Y-type shapes such as basic square forms with square cross sections and unconventional forms, in a suburban area (α=0.15) with a turbulence intensity of 10% and an urban area (α=0.33) with a turbulence intensity of 15%.

진동대를 이용한 TLCD의 진동성능실험

유장열(You Jang-Youl),송창현(Song Chang-Hyun),유기표(You Ki-Pyo),김영문(Kim Young-Moon) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)

Tuned liquid column damper is kind of passive mechanical damper which relies on the sloshing of liquid in a rigid tank for suppressing structural vibration. TLCD is attributable to several potential advantages low cost; easy to install in existing structures. The shaking table experiments were conducted to investigate the characteristics of water sloshing motion in TLCD. The parameter obtained from the experiments was wave height. The shaking table experiments show that the liquid sloshing relies on excitation amplitude of shaking table and frequency of device(TLCD). As mentioned above, The purpose of this study was to experimental study on mitigation of structural vibration for structural control applications using TLCD.

풍동실험을 이용한 전주시 풍속변화에 대한 연구

유장열(You Jang-Youl),유기표(You Gi-Pyo),김영문(Kim Young-Moon) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1

Rapid progress in urbanization has resulted in a change of the micro climate, especially in the urban area. In order to investigate the phenomenon of the heat island in the residential micro climate, a field survey was carried out by 4 sets of the residential type in Jeonju under typical winter synoptic condition. As analytic methode, it is used the comparison on the relation of the Land-to-Coverage Rate to Heat Island and Oxygen Concentration. And as a key question it is asked how stable characteristics of the micro climate will result from the survey of the Heat Island and the Oxygen Concentration, used as indicator. To ensure the trustworthy result of research, it is calculated the critical influence of the wind velocity and the Land-to-Coverage Rate. As a result of comparative analysis, it could be confirmed that the local temperatures in all sets of the residential type were higher than the average temperature in Jeon-Ju. But the housing type A "exclusive use for housing zone" has relatively the most stable and best living condition. On the contrary the residential type Band D has the worst toward the oxygen concentration in the time zone 9-12 a.m which didn't reach the minimum of the oxygen concentration 20.5%. It means that the higer the development and population density is, the worse is the situation of the Quality of Life in the residential types in accordance with the heat island and oxygon concentration.

공력탄성모형의 PTMD를 이용한 고층건물의 횡방향 풍진동 제어

유장열(You, Jang-Youl),김두기(Kim, Doo-Kie),김영문(Kim, Young-Moon),유기표(You, Ki-Pyo) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.1

As tall buildings become increasingly light and detailed, they tend to have a very low natural frequency and damping ratio. This leads them to become sensitive to the wind-induced vibrations. As such, an aeroelastic model equipped with PTMD was used to conduct an experiment on wind-induced vibration control of tall buildings. By manufacturing a PMD where the 1% of the weight of 1000g which is the weight of the aeroelastic model is 10g, five types of wind velocity was measured. The decrease in Across-Wind Wind-Induced Vibration Response was approximately 11% at a wind velocity of 1m/s, 19% at a wind velocity of 2m/s, approximately 15% at 3m/s, approximately 12% at 4m/s and approximately 10% at 5m/s. The more wind velocity in creased, the more the decrease in wind-induced vibration was greater.

풍동실험과 전산유체해석을 통한 저층 건물군 내에 세워진 고층건물 주변의 빌딩풍에 대한 보행자 풍환경평가 비교

유장열(You, Jang-Youl),박민우(Park, Min-Woo),남병희(Nam, Byung-Hee),유기표(You, Ki-Pyo) 대한건축학회 2023 대한건축학회논문집 Vol.39 No.12

Wind tunnel experiments and CFD were conducted to evaluate the pedestrian wind environment for strong winds generated around the building when a large high-rise building was built in the center of a low-rise building group among various types of urban areas. In order to verify the results of the wind tunnel test in this paper, it was compared and verified with the verified wind tunnel test results provided by the Architectural Institute of Japan(AIJ). As a result of the comparison, the correlation coefficient was distributed at 0.84-0.91, which was very similar to each other. CFD corrected wind velocity through turbulence energy and compared it with wind tunnel test results through the RNG k-ε model. The evaluation of pedestrian wind environment was conducted using Murakmi and Lawsons criteria. The correlation coefficient of the exceedance probability for each measurement point according to the wind speed ratio of the wind tunnel experiment and the computational fluid analysis was 0.9 or more, confirming a very high correlation. In addition, Murakmi and Lawson wind environment evaluation results showed almost the same trend, although there were differences in evaluation time.

돌출 간판의 이격거리에 따른 풍압계수 분포

유장열(You, Jang-Youl),남병희(Nam, Byung-Hee),김영문(Kim, Young-Moon) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2

Recently, with the increase of occurrence of typhoons and strong wind caused by global warming, many damages on outdoor facilities and outdoor advertizing signs take place. In particular, outdoor advertizing structures attached to the outsides of buildings are frequently destroyed. Protruding signboards on the outside wall of building cause more damages. Based on guidelines on protruding signboards determined by Seoul city, this study examined the effect of separation distances from building and signboard on the distribution of wind pressure coefficients and signboards. In both of the two cases, maximum and minimum wind pressure coefficients were similar, and they had similar distributions. However, Case 2 whose separation distance was shorter had smaller coefficient values than Case 1. It proves that the shorter separation distance is, the less protruding signboard is affected by wind.

건물 옥상에 설치되는 옥상 간판의 피크풍압 분포에 대한 연구

남병희,유장열,이남훈,유기표,Nam, Byung-Hee,You, Jang-Youl,Lee, Nam-Hun,You, Ki-Pyo 한국공간구조학회 2018 한국공간구조학회지 Vol.18 No.2

Unlike other types of outdoor advertisements, rooftop signboards are installed on the roofs of buildings, rather than on their outer walls. This means that the area of a rooftop signboard is commonly larger than that of a general outdoor signboard. Moreover, as such signboards are greatly influenced by the wind, they can suffer a lot of damage from typhoons and strong winds every year. However, there is no wind load specification for rooftop signboards. In this study, wind pressure experiments were conducted to investigate the peak wind pressure on each side of rooftop signboards installed on the roofs of 5-15 story buildings in a city center. The minimum peak wind pressure coefficient was -3.0 at the bottom edges of the front and back of the rooftop signboards and -2.0 along the entire length of the sides. As the height of the rooftop signboard increased with the increasing height of the buildings, the peak value was found to be larger than the absolute peak value for the minimum peak wind pressure coefficient. The maximum and minimum peak wind pressure distributions of the rooftop outdoor signboards were influenced by the position of the signboard and the wind angle.