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In this paper, the stress analysis of four kinds of slab systems - two-way slaba with beam, flat slabs, ribbed slabs and waffle slabs - was applied "Direct Design Method" In the ACI 318-77. After quantity of materials has been estimated, the coat estimation was done, and them compared with each system for economics. As the results of that, we got the following conclusions. 1. Flat slab system is comparatively an economical slab system for many kinds of live loads.(light or heavy loads) 2. The greater in live loads, the waffle slab system is the less than the other slab system in reinforcement. 3. In case that we are not concerned of form, we can get that the most economical slab system is the ribbed slab system. 4. Flat slab system can have not only the more efficient space but also the economical quantity of reinforcement and concrete than two-way slab system.
In this paper, dealt with the slabs that affected largly cost of building materials.The depth of slab is important in economical side compared with the other structures because slabs are two - dimensional structure and the lesser quantity of concrete in slabs, the lesser dead and the element of structure that can support the design load in lesser materials quantity. In this study, designed the flat slab, flat-plate slab and the two-way slab with beams that is appied to change the span the live load, and then calculated concrete quantity, reinforcement area and form area. By utilizing table, readers can calculate the cost of slab, and then we can find the more economic slab system of them. The method of slab design was applied Direct Design Method in ACI 318-77, and didn't consider the pattern loading and shearing reinforcement. Reinforcement area could be got to multipy the value in table by 3/3.24 because as a result that calculate the reinforcement area of the flat-plate slab I could got that it needed 3t. By reason of increasing dead load, didn't consider in case that slab thickness exceeded 30 cm.
This paper deals with the flat-plate slab system of the reinforced concrete slab sys tem. In reinforced concrete buildings, the flat-plate slab system bas more stories than other slab system in equal building height because that is able to have the same net story height in less story height than the other. Though this has the week point that is be in need of the construction's accuracy, form area is less than the other slab systen and construction is simple. By reason of that in our country this slab system has a good view that will be the frequent use in the future. On the occasion of using the flat-plate slab system in reinforced concrete building, I have designed the slabs of the 3×3 bay-reinforced concrete building in order to aim. And then compared with slab thickeness and span and live load, and reinforcement area in maximum bay area per unit area.
이 論文에서는 슬래브의 應力解析方法을 ACI 318-77의 D.D.M.을 적용해서 材料의 量을 算定한 후 單價算定을 하고 各 슬래브 形式의 經濟性에 對해 比較했다. In this paper, the stress analysis method of slabs was applied "Direct Design Method" in the ACI 318-77. After guantity of materials had been estimated, the cost estimation was done. and then compared with each system for economics.
This study had been carried out during june 1988 and june 1989 when 2.767 trees of Diospyros kaki cultivars were investigated. Fruit setted tree rate persontage was 63.3 of the 2.762 trees but productivity was reached to 37.429 Kg(240.436 pieces). This result was 70 times as much as previours year 1987. Consequently, investigated environmental conditions of this year were affording it's result as well as additional technical supports. It is pity to find out that which Factors were leading es not clear to decide which leave us for further study of it. Certain Environmental condition in Altitudinal boundary fo 200 meter of north side of Jeju Island was Excellently favoroble for teh test year 1988. A. NO below than 0℃ date was found. B. No Hurricane date was found in Jeju island Hurricane preavialing month is September. C. No detactible windy days were on flowering month of June. D. Soil condition was not in abnormallity stated as follows : pH : 5.75 O.M. : 3.75 P₂??: 11.5ppm K : 0.305(Me/100g) C.E.C : 15.6(Me/100g) Fe : 1.61% Mn : 163.5ppm Zn : 0.49ppm Cu : 0.275ppm Respective solubility in 0.1N Hcl solution