수직 경사풍을 받는 송전철탑의 풍하중 측정
Wind Tunnel Measurement of Aerodynamic Forces Acting on Transmission Tower Under Tilted Wind
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초록
산악 지역에 설치된 송전탑은 경사를 따라 부는 바람을 받으므로 수평방향 풍하중뿐만 아니라 수직방향 풍하중을 동시에 받 는다. 이에 본 연구에서는 1:25 축척 모델을 사용한 풍동 실험을 통하여 수직 경사풍에서의 송전 철탑의 풍하중을 측정하였다. 풍동실 험 결과를 보면, 수직력과 경사각 사이에 선형적인 관계인 것으로 나타났다. 수직 경사각이 ±30°일 때 수평 공기력은 7% 감소했지만 수직 공기력은 39% 증가하였다. 기존 IEC-60826 설계 기준은 수평풍에 의한 공기력 측정 결과와 잘 일치하였지만, 수직 경사풍 효과 를 효과적으로 반영하지 못하는 한계가 있다. 본 연구의 결과에서 산악 지형의 송전철탑 내풍 설계시에 수평풍 뿐만 아니라 경사풍의 영향도 고려할 필요가 있는 것으로 나타났다.
Abstract
Transmission towers in mountainous areas are subject to both horizontal and vertical wind loads because they receive wind blowing along the mountain slope. Therefore, in this study, the wind forces acting on transmission towers in vertically tilted wind was measured through wind tunnel tests using a 1:25 scale model. The results of the wind tunnel test showed that there was a linear relationship between the vertical aerodynamic force and the tilt angle. When the vertical tilt angle was ±30°, the horizontal aerodynamic force decreased by 7%, but the vertical aerodynamic force increased by 39%. The existing IEC-60826 design code was in good agreement with he measured aerodynamic force due to horizontal wind, but it had the limitation of not effectively reflecting the vertical tilted wind effect. The results of this study showed that it is necessary to consider the effects of not only horizontal wind but also tilted wind when designing the transmission towers in mountainous terrain.
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