우리나라 강풍의 발생성인별 계속시간 추정
Estimation of Wind-Duration According to the Origin of Occurrence of Strong Wind in Korea
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초록
강풍으로 인한 구조물의 파괴는 한계상태 이상의 풍하중으로 인한 파괴와 한계상태 보다 레벨은 낮지만 반복적인 풍하중에 의한 피로파괴로 나눌 수 있다. 한계상태설계 파괴에 대한 연구는 많이 이루어져 있으나, 강풍에 의한 피로파괴에 관한 연구는 드물다. 본 논문은 강풍에 의한 피로파괴 해석 시 사용할 수 있는 풍속의 계속시간에 관한 모델을 기상관측소로부터 획득한 자료를 사용하여 확률통계방법에 의하여 제시한 것이다. 강풍의 발생성인은 한국의 기상 특성에 따라 태풍, 전선풍, 계절풍으로 나누었고, 년최대풍 속자료에 대한 통계적인 처리는 극치Ⅰ형 누적분포함수를 사용하였다. 1회 강풍이 불었을 때 어떤 레벨에서 풍속의 계속시간은 풍속의 확률밀도함수와 최대풍속값에 의해 일반화된 누적신간의 곱으로 각 강풍의 발생성인에 따라 주어진다.
Abstract
In general, structural failures due to strong wind shall be divided into two categories, the one is failure by limit state wind loadings, the other is the cumulative fatigue failure under repeated wind loadings which have values less than that of limit state wind loadings. Various research results for limit state design were provided to engineers, however a study on the cumulative fatigue failure of structures under strong winds was rare. This paper aims at providing empirical models for wind-duration of strong wind to those who estimate fatigue damage of structures. The empirical models for wind-duration of strong wind were suggested by probabilistic analysis of meteorological wind speed data. The origin of occurrence of strong winds were divided into three types, Typhoon, Frontal system storm and Monsoon, due to the characteristics of climatical conditions in Korean. The statistical analysis on annual extreme wind speed data was investigated by cumulative density function of Type I. Empirical models of wind-duration of arbitrary wind speed level attacked one strong wind were constituted to the product of cumulative time generalized by maximum wind speed and probabilistic density function of wind speed in according to the origin of occurrence.
참고문헌 (7)
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