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풍하중을 받는 평면 막구조물의 동적불안정 판정에 관한 연구
한상을,후효무,Han, Sung-Eul,Hou, Xiao-Wu 한국전산구조공학회 2009 한국전산구조공학회논문집 Vol.22 No.2
본 논문에서는 풍하중을 받는 평면 막구조물의 동적불안정 판정을 규명하였다. 풍하중을 받는 막구조물의 지배방정식을 정식화할 경우 가장 중요한 것은 막 표면의 공기 압력을 합리적으로 산정하는 것이다. 베르누이 윈리에 의하여 유체 압력은 속도 퍼텐셜과 관계를 가지며 않은 날개 원리에 의해 막 표면 공기의 움직임을 일련의 와류로 간주하고 속도 퍼텐셜을 구할 수 있다. 이 논문에서는 가장 많이 쓰이는 3 절점 삼각형 막요소를 이용하여 가중 잔여치 갤러킨법을 적용한 안정 평가의 판별식을 유도하였다. 수치해석 모델로는 정사각형과 직사각형의 막구조물을 채택하였고 임계 풍속에 대한 초기인장력과 풍방향의 영향을 분석하였다. In this paper, dynamic instability of plane membrane structures under wind action has been studied. The key to solving the governing equations of membrane structures under wind action is how to obtain the air pressure on membrane. Based on Bernoulli's theorem, fluid pressure has a certain relationship with velocity potential. Velocity potential could be solved according to thin aerofoil theory, where air around the membrane is regarded as a sheet of vortices. In this paper, we take advantage of the most commonly used three-node triangular membrane element and weighted residual-Galerkin method to obtain the determining equation for stability evaluation. Square and rectangular membrane structures are studied. The influence of initial prestressing force and wind direction towards critical wind velocity are also analyzed in this paper.
중간 면진층을 가지는 래티스 돔 구조물의 병렬 다질점계 등가모델을 이용한 동적 거동 특성에 관한 연구
한상을,이상주,김민식,Han Sang-Eul,Lee Sang-Ju,Kim Min-Sik 한국전산구조공학회 2006 한국전산구조공학회논문집 Vol.19 No.2
일반적으로 구조물이 지진하중에 저항하기 위해서는 충분한 강성과 연성을 확보하여야 한다. 본 연구에서는 대공간 구조시스템의 지붕 구조와 하부 구조 사이에 면진 장치를 도입하는 방법을 사용하여 동적 거동 특성을 규명한다. 하부 구조의 강성과 질량의 크기에 대한 영향을 고려한 대공간 구조 시스템의 동적 거동 특성 규명 및 해석 과정 단순화를 위해 병렬 다질점계 등가모델을 도입한 본 논문은 향후 대공간 구조물의 성능 설계를 위한 기초적인 연구가 될 것이다. Generally, earthquake-resistant structural systems have to ensure the sufficient stiffness and ductility for stability In this paper, the spatial structures are applied an isolation system to boundary parts between roof systems and sub-structures. So, it is necessary to examine the characteristics of dynamic behaviors of spatial structures governed by higher modes rather than lower modes different from the cases of high-rise buildings. The objectives of this paper are to develop the equivalent lumped mass model to simplify an analytical processes and to investigate the dynamic behaviors of roof systems according to the mass and stiffness of sub-structures as a fundamental study of performance design for the spatial structures.
한상인,오수일 江原大學校附設體育科學硏究所 1994 江原大學校附設體育科學硏究所論文集 Vol.- No.18
Making a subject of study with middle school, high school boys and girls 59 pistol shooters, 59 rifle shooters and 55 general students (compared group) total 1973 students. In order to find out factors with exert influence upon pistol shooter and rifle shooter. Analyzing correlation shooting score, physique and physical fitness factor, and multiple regression analysis come to a conclusion as follow. 1) As physique factors are influenced on pistol shooter's shooting score. They seem to be standing height, chest circumference, upper limb length, upper arm circumference and index of finger length. Physical fitness factors seem to be strength of upper arm, balance, fIexibiligy and cardiorespiratory endurance. 2) In rifle shooters, factors are influenced on shooting score ate as follows; Physique factors seem to be standing height, weight, chest circumference, upper arm circumference, olwer limb circumference, index of finger length, Physical fitness factors seem to b strength of lower extremities, muscular endurance, flexbility and balance. 3) comparing pistol shooter with rifle shooter, Flexibility and balance seem to be common factors. However in pistol strength of upper arm and cardiorespriatory endurance seem to be important factors, in rifle strength lower extremities seems to be an important factor. 4) Between middle school shooter and ghigh school shooter. Physique and Physical fitness factors show to influence more on middle shcool shooter's shooting score than high school shooter's.