초록 ▼

Ⅳ. 연구개발결과
○ (제1세부과제) 수입 유통목재의 수종별 강도를 분석하고 목재인삼재배시설 규격을 15종으로 세분화하였음
- 기존 아피톤의 휨강도인 1,210 kgf/㎠에 비해 SG는 1,198, GG는 872, MG는 666으로 55～99%의 강도를 갖는 것으로 나타남
- 수종별, 인삼재배시설 모델별 안전적설심을 제시하고, 또 기둥간격을 조정함에 따른 안전적설심 변화를 제시하여 지역별 최적의 내재해 규격 모델을 선택하여 설치할 수 있도록 하였음
○ (제2세부과제) 철재인삼재배시설의 풍하중에 대한 골조와 기초

Ⅳ. 연구개발결과
○ (제1세부과제) 수입 유통목재의 수종별 강도를 분석하고 목재인삼재배시설 규격을 15종으로 세분화하였음
- 기존 아피톤의 휨강도인 1,210 kgf/㎠에 비해 SG는 1,198, GG는 872, MG는 666으로 55～99%의 강도를 갖는 것으로 나타남
- 수종별, 인삼재배시설 모델별 안전적설심을 제시하고, 또 기둥간격을 조정함에 따른 안전적설심 변화를 제시하여 지역별 최적의 내재해 규격 모델을 선택하여 설치할 수 있도록 하였음
○ (제2세부과제) 철재인삼재배시설의 풍하중에 대한 골조와 기초의 안전성 제시
- 철재인삼재배시설의 A형과 A-1형의 파이프 규격과 설치간격별 안전풍속은 11∼19㎧ (순간최대풍속 기준으로는 19∼31㎧) 수준임
- 나선말뚝기초를 적용한 철재인삼재배시설 A형과 A-2형의 적설내력 재하시험에서 지반침하가 발생하지 않아 나선말뚝기초의 안전성이 확보됨
○ (제1협동과제) 인삼재배시설 축소모형을 통한 풍력계수를 제시하고 및 풍하중을 산정함
- 관행식·후주연결식 인삼재배시설 해가림 막 지붕 및 벽의 순압력계수 산정
- 인삼재배시설의 풍하중 구성인자(가스트영향계수, 재현기간환산계수, 풍속고도분포계수, 풍속할증계수 등) 산정
- 방풍펜스 설치 효과 : (관행식) 설치 전 대비 풍속감소율 0.83∼0.84, (후주연결식) 0.81∼0.82
○ (제2협동과제) 차광 피복재가 같으면 관행 및 풍하중고려 해가림시설 내 미기상 및 인삼생육 차이 없음
- 차광재별 온도 : 4중직>차광지+흑2>은박지+흑2
- 차광재별 습도 : 차광지+흑2>4중직>은박지+흑2
- 차광재별 광투과율 : 차광지+흑2>은박지+흑2>4중직
- 차광재별 인삼생육 : 차광지+흑2>은박지+흑2=4중직

Abstract ▼

Due to a heavy snowfall in winter and a strong wind like a typhoon in July to September in South Korea sometimes stroke, there have been strong needs to develop anti-disaster agricultural facilities including ginseng-cultivated structures.
In this study, investment on recent distribution of squar

Due to a heavy snowfall in winter and a strong wind like a typhoon in July to September in South Korea sometimes stroke, there have been strong needs to develop anti-disaster agricultural facilities including ginseng-cultivated structures.
In this study, investment on recent distribution of square lumbers for ginseng cultivation structures was conducted. So the dimension, species of trees and cost of present distributing square lumbers were investigated. And bending test for the species of trees by using universal test machine(UTM) was conducted. Then structural analysis on snow loads was conducted to structure models and species oftrees. With the results, the improved standard for ginseng cultivation facilities was proposed to reflect a change of species of trees. In the investment result on dimension of the section for imported square lumbers, they had larger size than standard dimensions-30×36 mm. Also section modulus, Z that is important sectional property to structural analysis was bigger than existing standard, 6,480 ㎣ and dimension of present distributing square lumbers was adequate. In result of bending strength test, SG type was 1,198 and GG type was 872 and MG type was 666 kg/㎠. This was 55~99% lower than bending strength of apiton(existing material), 1,210 kg/㎠. Therefore new measures need to be worked out to secure the structural safety of ginseng cultivation facilities when these species of trees was used as a structural element. And safety snow depths according to species of trees, models of ginseng cultivation facilities was presented. In addition to, safety snow depths according to columns interval of the structures was presented and user could select an adequate model for their’s region and condition.
Evaluation of structural stabilities for some types of steel-framed facilities to cultivate ginseng was carried out. In the previous work, structural evaluations for the facilities such as which parts were the weakest there and accordingly how to reinforce them were mainly discussed. Nevertheless, there was much less computational and experimental information available. So, the present study attempted to provide a comprehensive view of the structural stability through structural analyses by using finite element analysis as well as field measurements by way of snow load tests. The structural analyses for the wind and snow load were conducted and then the experiments were accomplished by applying the equivalent load of the safety snow-depth predicted in FEA to steel frames of the facility so that the facility installed with adequate spiral piles could be investigated whether the pillar has subsided or not. For the facility predicted to be with a safety snow-depth of 53cm in structural analysis, the experiment showed that the permanent deformation at main rafters and columns was little tiny and hence negligible. Although there was a slight discrepancy between FEA predictions and experimental measurements, it made sure that the FEA calculations seemed to be credible. For all that, it should be mentioned that more several load tests are necessary to secure the safety of the other facilities predicted in this study.
Ginseng is a semi-shade perennial plant cultivated in sloping, sun-shaded areas in Korea. Recently, owing to frequent wind damage, ginseng cultivation structures considering wind loads were complemented and came into request for field demonstration test about growth stability. Studies show that there were no different between existing and developing facilities and large significant among shading materials in many ways.
The wind loads standards on current resistant disaster standards for horticulture facility is poor when designing the ginseng facilities, so the purpose of this study was to propose the wind loads standards(plan) for estimating wind loads acting on a ginseng facilities. The estimating method of wind loads should be established major factor in order to estimate the wind loads acting on a ginseng facilities. This study was utilized the Korean building code as the background. Because the maintenance period of a ginseng facilities is different from the buildings, studies on the more rational design were carried out. The results of this study are summarized as follows:1) The estimating method of wind loads acting on the ginseng facilities was established. If it is judged that the specific factors presented in Korea building code can be utilized for ginseng facilities, Korean building code was quoted. And the parts that require modification are proposed by utilizing the result of this study, 2) The basic wind speed map was drawn up a return period of 30 years, because the maintenance period of a ginseng facilities is different from those of building, 3) The wind pressure acting on ginseng facilities was measured using a wind tunnel test. As a result, net pressure coefficient was proposed according to installation type and position, 4) The wind speed-up factors on the topographies as the valleys which could occur to topographic funneling effect were proposed, 5) If the windbreak was installed around the ginseng facilities, the wind loads reduction effect is occurring. The wind loads reduction effect through wind tunnel test was proposed to assess quantitatively. By the result of the above, the wind loads standards(plan) of ginseng facilities were proposed to the policy. Consequently, the wind loads acting on ginseng facilities was estimated quantitatively and it is shown that there would be a safer design.