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제주지역 감귤재배용 단일피복 무가온하우스의 구조안전성 분석
염성현(Sung Hyun Yum),김학주(Hak Joo Kim),전희(Hee Chun),이시영(Si Young Lee),강윤임(Yun Im Kang),김영효(Young Hyo Kim),김용호(Yong Ho Kim) (사)한국생물환경조절학회 2005 생물환경조절학회지 Vol.14 No.3
길이 40m, 폭 5.5 m의 단일피복 구조의 8연동 무가온하우스 상단부에 설계적설심 19.1 ㎝의 눈이 쌓인다는 조건과 시설 측면으로 설계풍속 36.6 mㆍs?¹의 바람이 분다는 조건 그리고 참고자료로 활용하기 위해 적용한 최대적설심 37.8 ㎝의 눈이 쌓인다는 조건과 순간최대풍속 60.0mㆍs?¹의 강풍이 분다는 조건에서 유동 및 구조강도 해석을 수행하였다. 적설하중 조건에서는 설계적설심 19.1 ㎝와 최대적설심 37.8 ㎝에서 파이프에 걸리는 최대응력이 각각 53.8Nㆍ㎜?²과 107Nㆍ㎜?²으로 재료의 허용응력 보다 작은 것으로 나타나 안전한 것으로 분석되었으나, 설계풍속 36.6 mㆍs?¹와 순간최대풍속 60.0 mㆍs?¹의 풍하중 조건에서는 파이프에 걸리는 최대응력이 각각 250Nㆍ㎜?²과 672Nㆍ㎜?²으로 재료의 허용응력을 모두 초과하여 플라스틱하우스가 불안전한 것으로 분석되었다. This study was carried out to evaluate the structural stability in a non-heating greenhouse with a single cover for Citrus cultivation which was built up in Jeju on the basis of the drawing designed by Jejudo Agricultural Research & Extension Services and also to make use of the data for developing a standardized non-heating greenhouse in Jeju. The analysis of a structural stability was conducted by using CFX-5.7 and ANSYS under the design condition of a maximum accumulated snow-depth of 19.1 ㎝ as well as an instantaneous maximum wind velocity of 36.6 mㆍs?¹ which was set up on the basis of meteorological statistics in Jeju. As a result, the maximum von-Mises stress applied on pipes under the wind velocity of 36.6 mㆍs?¹ showed a value of 250 Nㆍ㎜?² which was greater than the allowable stress of the pipe with a value of 235.4 Nㆍ㎜?² (=2,400 ㎏ㆍ㎝?²) and also 53.8 Nㆍ㎜?² under the snow-depth of 19.1 ㎝, respectively. This result suggested that the greenhouse be unstable under the design condition of an instantaneous wind velocity of 36.6 mㆍs?¹ so that it was necessary for the greenhouse to be reinforced to secure the structural stability.
산광성 직조필름 피복 시설 내 환경 및 풋고추 군락생산성
전희(Hee Chun),염성현(Sung-Hyun Yum),강윤임(Yun-Im Kang),김학주(Hark-Ju Kim),이시영(Si-Young Lee) 한국원예학회 2005 원예과학기술지 Vol.23 No.4
The canopy productivity of green pepper in the greenhouse was promoted by using a light-diffused woven (LD) film having high anti-drop and light diffusion rate. The dry matter of green pepper under LD film was larger than that of green pepper under polyethylene film except from 90 to 120 ㎝ in plant height. The leaves of main stem below the first node were removed for their oldness and disease, thereby the light transmittance from bottom to 30 ㎝ was higher than that from 30 to 90 ㎝ plant height. The fruit setting and yield of green pepper under LD film were higher by 10.9% and 12% than those of green pepper under polyethylene film.