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조강표,홍성일,정명채 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3
Wind loads on buildings in realistic environments surrounded by neighboring buildings may be considerably different from those measured on isolated buildings. Wind-induced interference effects depend mainly on the geometry and arrangement of these structures, their orientation and upstream terrain conditions. The most important factor among them is the arrangement of building structures. It is examined in this study that how wind loads on a high-rise building with square section are affected by the arrangement of neighboring buildings with side ratio of 1.5 to the measured building. Wind-induced interference effects on high-rise buildings were performed by wind-tunnel tests of force balance model. Interference factor was defined as ratio of wind force on a building with interfering buildings present to wind force on an isolated building.
조강표,홍성일,조기성,정형조 한국풍공학회 2005 한국풍공학회지 Vol.9 No.2
In this paper, wind-resistance of a transmission tower was examined, using a 3-dimensional topographic model which simulates the site several transmission towers collapsed during typhoon “Maemi". The wind loads obtained from two different codes were compared with wind load considering 3-D topographic effects. Wind responses of 154kV transmission tower were also compared. The wind response with 3-D topographic effects is larger than that obtained from each code. It is observed that especially, the compressive stress in main vertical member on the corner is greater than allowable buckling stress, and greater than even allowable compressive stress. Therefore, 3-D topographic effects must be taken into account in the wind-resistant design of transmission towers when constructed in the hills. It is inferred that several transmission towers collapsed due to wind speed-up effects. 본 논문에서는 2003년 태풍 ‘매미’에 의해 붕괴된 송전철탑에 위치한 지역의 3차원 지형모형을 이용하여 송전철탑의 내풍 안전성을 검토하였다. 붕괴된 송전철탑의 위치에서 서로 다른 두 개의 풍하중 기준을 적용하여 풍하중을 산정하고, 풍동실험을 수행하여 얻은 풍속할증계수를 적용하여 얻은 풍하중과 비교하였다. 각각의 풍하중을 154kV급 규모의 송전철탑에 적용하여 풍응답 수치해석을 수행하였다. 풍동실험을 통해 얻은 풍속할증계수를 고려할 경우의 풍응답은 각각의 기준에 의해 구한 풍응답보다 수평변위, 압축응력도 등에서 훨씬 큰 응답이 나타났다. 특히 주주재에서 발생하는 압축응력도는 허용좌굴응력도를 넘어 허용압축응력도까지 초과하는 것으로 나타났다. 따라서 산악지형에 위치한 송전철탑의 풍하중을 산정할 때는 3차원 지형효과를 고려하지 않으면 안 된다. 태풍 ‘매미’에 의해 붕괴된 송전철탑도 풍속할증에 의한 과도한 풍하중에 의해 붕괴된 것으로 판단된다.
조강표,김선희,홍성일 한국풍공학회 2009 한국풍공학회지 Vol.13 No.3
The allowable acceleration test was performed using a shaking table to establish human comfort criteria of horizontal vibration of tall buildings, which are not prepared in our country, under the assumption that the first mode of tall buildings dominates. Also, buildings were classified by residential buildings and office buildings using trend lines of allowable acceleration obtained from the allowable acceleration test. Comparing with foreign standards of NBCC 1995 and ISO 10137, which estimate horizontal vibration classified by residential buildings and office buildings, curves estimating horizontal vibration suited to our country were presented. 본 논문은 현재 국내에 제정되어 있지 않은 건축물의 진동사용성 평가기준을 위한 기초자료를 확보하기 위해 초고층 건축물이 1차모드가 지배적이라는 가정하에 먼저 진동대를 이용한 허용가속도 체험실험을 실시하였다. ‘건축물의 용도’를 고려하여 허용가속도 체험실험 결과에 따른 허용가속도추세선을 이용해 주거용 건축물과 사무용 건축물로 분류하였다. 또한 국외의 기준 중 주거용 건축물과 사무용 건축물로 분류하여 진동사용성 평가를 하고 있는 ‘NBCC 2005'그리고 ‘ISO 10137’과 비교 및 분석하여 국내에 적합한 진동사용성 평가기준안을 제안하였다.
조강표,신성우,정승환,조수연,Cho, Kang-Pyo,Shin, Sung-Woo,Jeong, Seung-Hwan,Cho, Soo-Youn 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.3
본 논문에서는 진동대를 이용하여 고층 건축물의 수평진동에 대한 지각임계가속도를 측정하였다. 바람에 의한 초고층 건축물의 과도한 진동은 거주자들에게 시각차와 현기증 같은 불쾌감을 줄 수 있다. 초고층 건축물 거주자들에게 쾌적한 환경을 제공하기 위해서는 가속도를 제한할 필요가 있다. 초고층 건축물은 1차 고유주기에 지배적이다 본 연구진은 1차 고유주기를 재연하기 위해 진동대를 사용하여 사인파진동에서 실험을 수행하였다. 실험은 진동하우스를 제작하고, 건장한 40명의 피험자를 대상으로 실시하였다 40명의 피험자를 8명씩 5개조로 나누고, 특정주파수범위$(0.2Hz{\sim}1.2Hz)$에서 가속도를 증가시키면서 수평진동에 대한 인지도를 측정하였다. 수평진동실험으로 피험자들의 진동에 대한 인지도를 누적분포표로 만들고, $0{\sim}20%,\;21{\sim}40%,\;41{\sim}60%,\;61{\sim}80%,\;81{\sim}100%$의 누적분포에 대해 추세선을 그려서 성능평가곡선을 작성하였다. In this paper, acceleration threshold of perception for the horizontal vibration of tall buildings was estimated. Excessive vibration of tall buildings by wind can give displeasure, such as giddiness and visual insecurity. To provide comfortable environment to residents of tall buildings, acceleration needs to be limited. For tall buildings the first mode of vibration is dominant. To reproduce the first mode of vibration, experiments were performed by generating sine waves by a shaking table. A nitration house was made and forty persons were employed for experiments. The forty persons were organized into five experimental groups, each of which was composed of eight persons, and the threshold of perception for horizontal vibration was measured by increasing acceleration in the range of 0.2Hz through 1.2Hz of frequency, Performance curves were obtained by dividing the distribution of perception for horizontal vibration into the range of $0{\sim}20%,\;21{\sim}40%,\;41{\sim}60%,\;61{\sim}80%\;and\;81{\sim}100%$ and by fitting curves.
조강표,정승환 대한건축학회 2011 대한건축학회논문집 Vol. No.
In the paper, wind inflows to a building group affected by strong winds in urban area and wind outflows from the building group are computed by computational fluid dynamics analysis. For eight wind directions, flow rates at inlet and exit areas are computed based on the computed inflows and outflows. Also, the ratio of flow rates, which is the ratio of flow rate at exit area to that at inlet area, is evaluated according to the rate of building area to inlet area, and the effects that the wind directions and the rate of building area to inlet area have on the ratio of flow rates are investigated. It was found in the study that due to buildings, velocities at most points in the area of the building group decreased. It was also shown that the ratio of flow rates ranged from approximately 5.8% to 28.9% for the eight wind directions, and that generally the less the rate of building area to inlet area, the larger the ratio of flow rates.