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임준택,보거즈비엔키에비치 한국풍공학회 2014 한국풍공학회지 Vol.18 No.4
A popular modern architectural form for tall buildings is two (or more) towers which are structurally linked through such features as a shared podium or sky-bridges. The fundamental features of the wind loading and the structural links of such buildings can be studied by measuring load components on the individual unlinked towers along with their correlations. This paper describes application of dual high frequency force balance (DHFFB) in a wind tunnel study of the base wind loading exerted on generic tall twin buildings in close proximity. Light models of two identical generic tall buildings of square plan were mounted on DHFFB and the base wind loading exerted on the buildings was simultaneously acquired. The effects of the relative positions of the buildings on the correlations and coherences involving loading components on each building and on the two buildings were investigated. For some relative positions, the effects of the building proximity on the wind loading were significant and the loading was markedly different from that exerted on single buildings. In addition, the correlations between the loadings on the two buildings were high. These effects have potential to significantly impact, for example, the modally-coupled resonant responses of the buildings to the aerodynamic excitations. The presented results were not meant to be recommended for direct application in wind resistant design of tall twin buildings. They were intended to show that wind loading on tall buildings in close proximity is significantly different from that on single buildings and that it can be conveniently mapped using DHFFB.
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Wind-induced response of structurally coupled twin tall buildings
임준택,보거즈비엔키에비치 한국풍공학회 2007 Wind and Structures, An International Journal (WAS Vol.10 No.4
The paper describes a study of the effects of structural coupling on the wind-induced response of twin tall buildings connected by a skybridge. Development of a dual high-frequency force balance used in wind tunnel investigation and background information on the methodology employed in analysis are presented. Comparisons of the wind-induced building response (rooftop acceleration) of structurally coupled and uncoupled twin buildings are provided and the influence of structural coupling is assessed. It is found that the adverse aerodynamic interference effects caused by close proximity of the buildings can be significantly reduced by the coupling. Neglecting of such interactions may lead to excessively conservative estimates of the wind-induced response of the buildings. The presented findings suggest that structural coupling should be included in wind-resistant design of twin tall buildings.
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이영규,이승수,함희정,보거즈비엔키에비치 한국풍공학회 2009 한국풍공학회지 Vol.13 No.3
In the study, design wind speed is estimated for offshore structures in south-western region in Korea. The basic wind speed is evaluated by an extreme value frequency analysis with long-term wind series and a typhoon simulation using historic typhoon data. The results of both have a good agreement. For the offshore structures, they would experience the extreme winds blowing over the water surface, where the wind speed is greater than that on the land because the wind speed on the water surface is not zero but the same to water speed due to the no-slip condition. In this situation the design wind speed over the water surface may be increased by about 20% than that on the land surface. 본 연구에서, 서남해안지역, 해상구조물에 대한 설계풍속을 산정하였다. 장기 풍속 시계열을 이용한 극치빈도분석법과 태풍자료를 이용한 태풍 시뮬레이션의 두 가지 방법으로 기본풍속을 산정하였으며, 두 가지 방식 모두 일관된 기본풍속을 추정하였다. 해상구조물의 경우, 해상을 풍상측으로 하는 풍속이 불어올 수 있으며, 이런 경우 해상에서의 점착 조건에 의해서 경계면에서 풍속이 0이 아닌 해수의 흐름속도가 되어 지상풍속보다 빨라지게 된다. 이와 같은 경우의 설계풍속은 지상조건의 설계풍속보다 약 20% 크게 추정된다.
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