極限强 理論에 依한 設計技法에 關한 基礎的 硏究

成基泰 忠州大學校 1985 한국교통대학교 논문집 Vol.19 No.1

This thesis is written to use step by step design procedures in accordance with the ultimate strength Design method for the design of BEAM that was being used the working stress design method. The results are as follows ; 1. Ultimate strength Design than working stress Design is (1) Coefficient of safety is more equilibrium. (2) The materials are saved. 2. It is intended for use by those having a general familiarity with ultimate strength design method. 3. If you are perfectly comprehended about the basic procedures of step by step ultimate strength design method, you can save lots of time to necessary in the design.

메트릭스 構造解析法에 關한 硏究 : 應力法을 中心으로

成基泰 忠州大學校 1989 한국교통대학교 논문집 Vol.23 No.-

The analysis of static indeterminate structure was investigated by matrix solution methods, and the results as follow. 1. The node load {P} and stress {Q} were defined and the force transformation, element flexibility matrix calculated under condition, of ∑H=0, ∑V=0, ∑M=0. 2. In this condition, the stress {Q} and the node displacement {Q} were also calculated. This method was more useful and easy than other methods.

콘크리트 비충전 강합성 바닥판의 활하중 횡분배 거동에 관한 연구

성기태,이승용 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-

Live load lateral distribution behavior of concrete unfilled composite steel grid deck which upper part of inverted T-shape steel embedded in reinforced concrete slab is analyzed. From the results of analyses, it is concluded that maximum live load lateral distribution coefficient increase and strength of concrete unfilled composite steel grid deck decrease relatively with the transverse direction stiffness increasing. Fitting equations which can predict the maximum live load lateral distribution coefficient and strength were developed from the analyzed results. The reliability of the fitting equations were evaluated by comparing with the experiment results.

저슬럼프 원심력 콘크리트의 섬유보강 효과에 관한 실험적 연구

성기태,이승용 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-

In this paper, structural performance was reviewed through a variety of experimental researches in order to develop high performance low slump spun concrete which is more durable than concrete and highly bending-resistant to an external force and whose microcrack is minimized. With the major study objectives of reviewing the difference of fiber type, fiber volume, transverse, and spiral reinforcement spacing, a basic performance test and static structure test were conducted. For a basic performance test, in order to determine the optimal fiber volume of spun concrete, various test molds with different variables were made and a compression strength test and bending test were carried out. For a static structural test, full-scale pole specimens with various variables were made based on the mix proportion determined at a basic performance test and a longitudinal compression test and transverse loading test were conducted. Through many tests, the structural performance of spun concrete depending on tie reinforcement volume, fiber type, and fiber volume are studied. The result of this study will be used as important basic data for the development of fiber reinforcement spun concrete products.

고강도 콘크리트 부재의 전단이론 고찰

성기태 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-

콘크리트 이론에서 전단이론은 휨 이론에 비하여 그 발전 속도가 느린 편이다. 그 이유는 사인장균열의 발생시기와 종류 및 균열진전에 영향을 미치는 요소가 약 20여 가지에 이르고 이들이 주는 각각의 영향과 상호관계에 대해서 정확하게 밝혀지지 못했기 때문이다. 고찰 결과를 종합하면 고강도 콘크리트 부재에 보통 강도의 콘크리트 부재의 전단강도 계산식이 그대로 적용되기에는 여러 가지 문제점이 있는 것으로 판단된다. 따라서 현재 여러 시방서에서 적용하는 것과 마찬가지로 지금까지의 실험결과가 적용될 수 있는 콘크리트의 압축강도를 그 적용의 상한선으로 하는 것이 현실적으로 사용할 수 있는 대안이라고 판단된다. 앞으로는 고강도화에 따른 균일면의 골재 맞물림 효과와 전단철근의 부착특성 등을 고려하는 이론적, 실험적 연구가 필요할 것으로 생각된다. It has been known that the shear behavior of concrete structures is less well characterized than the flexural behavior. The mechanisms of crack initiation and development under shear are very complicated. Numerous factors are involved and their interactions are not well understood yet. As indicated in this study, equations for shear for the normal strength concrete may not be applicable to the high strength concrete and therefore, an upper limit of concrete strength should better be specified for the use of the current codes in the specifications. In addition, researches should be further extended incorporating the effects of aggregate interactions and rebar-bonding characteristics of high strength concrete. 요

鋼纖維 補强 Concrete의 强度特性에 關한 硏究 : (Crack과 Deflection을 中心으로)

成基泰 忠州大學校 1986 한국교통대학교 논문집 Vol.20 No.1

The role of steel fiber reinforcement in controlling cracking and deformation in plain concrete and conventional reinforced members is illustrated by three series of tests. The conclusions derived from these tests are given below. 1. Even a small amount of fiber reinforcement redues the suddenness of failure of the unreinforced matrix, it imparts ductility to the composite. With fiber volumes of about 1 percent , the stability of crack propagation extends over a wide range of loading, and the three stages of crack initiation, subcritical crack growh and unstable crack propagation can be clearly identified. 2. When used in conventional reinforced concrete beams, steel fiber reinforcement (up to 1.2 percent) mobilizes the tension zone much more effectively to resist the extermal load. 3. The stiffness of the beams at service loads is increased by 50 to 70 percent resulting in substantial reductions of deflection, steel stram, rotation and curvature. 4. In conventionally reinforced flat plates, the addition of fiber reinforcements produced substantial reductions in deflection and steel at all stages of loading. 5. With a fiber volume of 1.2 percent, the increase in the punching shear strenght was 42 percent. 6. The fiber reinforcement not only controlled the slab deformation at all stages of loading, but also imparted a higher residual load capacity after failure.

고원식교차로 조립블록의 구조성능에 관한 실험적 연구

성기태 韓國交通大學校 1967 한국교통대학교 논문집 Vol.51 No.-

This paper was performed to verify the structural performance of the dark red prefabricated blocks used in the raised intersection. The prefabricated blocks can replace the conventional dark red pavement in the intersection, and has the advantage of construction convenience. To determine the structural performance of the prefabricated blocks, the bending test, shear test and fatigue test were conducted. From the results, the dark red prefabricated blocks has sufficient structural performance, and it can be appropriately used as raised intersection facilities.

土木工事의 工程表에 關한 硏究

成基泰 忠州大學校 1985 한국교통대학교 논문집 Vol.18 No.2

This part civil engineering works planning, scheduling, and progress reporting by the program evaluation and review technique (P.E.R.T) or critical path method (CPM) A diagrammatic representation or the sequence of accomplishment and interdependency of events and activities in a multi-event offort. The particular sequence of activities in a network that comprises the longest time duration through the network from start to finish. The path with the smallest amount of positive slack or the largest amount of negative slack.

FCM 工法으로 架設되는 P.C 橋梁에 鋼線配置의 最適設計

成基泰 충주대학교 1990 한국교통대학교 논문집 Vol.24 No.-

This paper deals with the optimization problem in P.C bridges, built by the progressive contilever method. Since structural system is changed according to the construction steps under the contilever method of construction, it is required to consider simultaneously stress constraints in the following tw cases: 1. Cantilever members under where construction stage, the first prostreeing is applied 2. Continuous beam under Service loads, the Second prestressing is applied. By the method, Some application problems such as span continuous P,C beams built in catilever method of construction, can be solved. Various combinations of object funetion are tried to check the cost sensitivity of design variables.

양생온도에 따른 콘크리트의 강도발현 특성

성기태,홍창우 충주대 산업과학기술연구소 1998 産業科學論文集 Vol.6 No.-

The maturity concept was adopted to predict the strength of concrete, which was subjected to same temperature conditions and variable curing conditions. Penetration test and compressive test were conducted to measure the initial and final setting time and the compressible strength of concrete specimen, respectively. Also, the temperature and time were recorded at some intervals of time for calculating the maturity. The initial and final setting were delayed as the w/c ratio increased and curing temperature decreased. The activation energy decreased as the w/c ratio increased. The relationships at the relative strength and the equivalent age were proposed at different w/c ratio for the same temperature curing condition, and these were applied for the variable curing conditions.