성능평가를 고려한 철근콘크리트교의 경제성 분석

손용우,정영채,김종길 한국전산구조공학회 2004 한국전산구조공학회논문집 Vol.17 No.2

Recently, it is really concerned about corrosion and aging of reinforced concrete bridges. Corrosional steel reinforcing in concrete affects not only safety of bridges structure but also bending strength of reinforced concrete's member. Rate of corrosion, characteristic of bending strength, and economical evaluation aren't clear in reinforced concrete, considering performance evaluation. The purpose of study is as follows. It studies about ability of resistance's strength and cost of life cycle according to reduction of steel reinforcing's corrosion. Moreover, it shows calculating formula of bending strength with corrosion of current rate and exactly evaluates about the rest life at corrosional reinforced concrete bridges. 최근의 철근콘크리트 교량의 부식과 노후화에 대한 관심이 많다. 콘크리트 안의 부식되어진 철근은 교량구조의 안전뿐만 아니라 철근콘크리트 부재의 휨강도에도 영향을 준다. 기존의 성능평가를 고려한 철근콘크리트속의 부식율 및 휨강도 특성 경제성 분석은 명확하지 많았다. 본 연구의 목적은 철근의 부식감소에 따라서 철근콘크리트 교량의 저항강도기능과 생애주기비용을 연구하고자 한다 따라서 현재의 부식 및 휨강도 산출공식을 제시하고 부식된 철근 콘크리트 교량의 잔여수명을 정확히 평가하고자 한다.

교량기초의 신뢰성 설계규준에 관한 연구

손용우,정철원 한국전산구조공학회 1993 한국전산구조공학회논문집 Vol.6 No.1

Current Bridge foundation design is based on Working Stress Design(WSD), but Load Factor Based on Optimum Reliability(LFBOR) design method is more rational than the WSD. For this reason, this study proposes a reliability based design criteria for the bridge foundation, which is most common type of bridge foundation(Shallow, Pile and Caission), and also proposes the theoretical basis of nominal safety factors of stability analysis by introducing the reliability theory. The limit state equations of stability analysis of bridge foundation and the uncertainty measuring algorithms of each equation are also derived by Cornell's MFOSM(Mean First Order 2nd Moment Methods)using the stability analysis fourmula Highway Bridge Design Codes.

교량기초의 신뢰성 설계규준에 관한 연구

손용우,정철원 圓光大學校 環境建設硏究所 1996 環境建設論文集 Vol.5 No.-

Current Brigde foundation design is based on Working Stress Design(WSD), but Load Factor Based on Optimum Reliability(LFBOR) design method is more rational than the WSD. For this reason, this study proposes a reliability based design criteria for the bridge foundation, which is most common type of bridge foundation(Shallow, Pile and Caission), and also proposes the theoretical basis of nominal safety factors of stability analysis by introducing the reliability theory. The limit state equations of stability analysis of bridge foundation and the uncertainty measuring algorithms of each equation are also derived by Cornell's MFOSM(Mean First Order 2nd Mornent Methods)using the stability analysis fourmula Highway Bridge Design Codes.

P.S. 콘크리트 보의 비선형 최적설계

정철원,최규문,손용우 圓光大學校 1994 論文集 Vol.28 No.2

비선형 최적설계법을 개발하였다. 이 방법의 목적은 PC구조물의 극한에서 나타나는 거동을 예측하는 것이다. 그에 따른 주요결과를 제시하였고 콘크리트와 강의 실제 거동의 실험 과정에서 겪는 난점을 거론하였다. 특히 PC강선에서 이용가능한 다양한 응력-변형 관계를 비교하고 실제 특성에서 나타난 차이점을 관찰하였다. 그 관계들에 관하여 추천된 식들의 해당계수를 제시하였다. 그 결과는 PC강선의 종류와 양, 비 프리스트레스 인장과 압축철근의 양, 극한 콘크리트압축변형 등과 같은 주요 변수들의 극한 거동에서 영향이 나타난다는 것이다. 그 영향과 결과를 유도한 규준을 비교하는 데에 중점을 두었다. 이 연구에서 얻은 결과들로써 만약 추천된 규준을 사용하는 경우에 그 규준이 불안정한 설계를 유도할 가능성이 있는 부분과 또 관찰된 경향에 알맞게 규준을 수정하기 위하여 필요한 점을 지적할 수 있게 되었다. An approximate nonlinear design procedure is development. It is the aim of the procedure to predict the behavior at ultimate of prestressed and partially prestressed concrete members. We showed the main results and discussed some difficulties which we come (on in) simulating the actual behavior of concrete and steel. Especially the various available stress-strain relationships for prestressing steels are compared and variability in their actual properties is observed. Corresponding coefficients of recommended equations are given. It is the result that the influence on ultimate behavior of major variables such as type and amount of prestressing steel, the amount of nonprestressed tensile, compressive reinforcement, and the ultimate concrete compressive strain exists. Then we put an empasis on comparing the influence with code derived results. By results of this study, we could point out that if used. where the recommended code may lead to an unsafe design and what modifications may be needed to make the code suitable to the observed trends.

퍼지집합론을 이용한 건설공사의 위험도분석 평가

손용우,이정식,박철수,이증빈 대한토목학회 1998 대한토목학회 학술발표회 논문집 Vol.1998 No.1

기존RC교량 바닥판의 유지관리를 위한 전문가 시스템 개발

손용우,이증빈,이채규,손승현,안영기 한국구조물진단유지관리학회 2002 한국구조물진단학회 학술발표회논문집 Vol.- No.-

교량기초의 변단면말뚝 수직진동에 대한 연구

손용우,정철원 圓光大學校 環境建設硏究所 1993 環境建設論文集 Vol.2 No.-

We developed differentual governing equations for non-uniform piles, the back ground is on Novak's theory for uniform piles. The equations are integrated numerically by use of an efficient two-step iterative scheme. In the proposed model, the base of the mathematical formulations employed is on the conventional idealization of circular elastic pile which is embedded in a semi-infinite, isotropic and elastic soil medium. According to expectation, for areas of practical applications, the model would play a part of an effective tool to study the influence of geometry and non-uniformity of the resonant frequency and amplitude of the pile ; factors that have an important point in the dynamic design of piles. It is demonstrated by analysing the response of tapered and two-component piles that the model would be applicable to the practices, especiallay for the case of end-bearing and floating conditions. From the study, we showed that the results are consistent with those of previously reports by using more complex models on the basis of the finite-element or finite difference techniques. With analysing the case of a uniform pile about availability of closed-form solutions, it is demonstrated that the model comes to be proved.

퍼지의사결정을 이용한 RC구조물의 건전성평가

손용우,정영채,김종길 한국전산구조공학회 2004 한국전산구조공학회논문집 Vol.17 No.2

철근콘크리트 구조물의 보수ㆍ보강 등의 유지관리를 위해서는 내구성과 내하성을 동시에 고려한 건전성평가의 의사결정기준이 절실히 요구된다. 본 논문은 CART-ANFIS을 사용하는 철근콘크리트 구조물에 대하여 효율적인 모델을 나타내었다. 철근콘크리트 구조물의 손상과 진단 등에 활용되어온 분류형 전문가시스템의 일종인 퍼지이론을 이용한 결정목 구조와 기존의 인공신경망을 이용한 결정목 구조의 건전성평가를 비교 분석한다. 손상된 철근콘크리트의 내구성 회복을 위한 보강설계 이론과 내하력 증가를 위한 보장설계 이론을 정립시켜 손상검출의 산정식을 유도하였다. 본 연구의 건전성 평가시스템 모델을 이용함으로서 보다 효율적인 철근콘크리트 유지관리 뿐만 아니라 생애주기비용 예측을 수행 할 수 있다. It really needs fuzzy decision making of integrity assessment considering about both durability and load carrying capacity for maintenance and administration, such as repairing and reinforcing. This thesis shows efficient models about reinforced concrete structure using CART-ANFIS. It compares and analyzes decision trees parts of expert system, using the theory of fuzzy, and applying damage & diagnosis at reinforced concrete structure and decision trees of integrity assessment using established artificial neural. Decided the theory of reinforcement design for recovery of durability at damaged concrete & the theory of reinforcement design for increasing load carrying capacity keep stability of damage and detection. It is more efficient maintenance and administration at reinforced concrete for using integrity assessment model of this study and can carry out predicting cost of life cycle.

교량기초의 신뢰성 설계규준에 관한 연구

손용우,정철원 한국전산구조공학회 1993 전산구조공학 Vol.6 No.1

Current Bridge foundation design is based on Working Stress Design(WSD), but Load Factor Based on Optimum Reliability(LFBOR) design method is more rational than the WSD. For this reason, this study proposes a reliability based design criteria for the bridge foundation, which is most common type of bridge foundation(Shallow, Pile and Caission), and also proposes the theoretical basis of nominal safety factors of stability analysis by introducing the reliability theory. The limit state equations of stability analysis of bridge foundation and the uncertainty measuring algorithms of each equation are also derived by Cornell's MFOSM(Mean First Order 2nd Moment Methods)using the stability analysis fourmula Highway Bridge Design Codes.

직접조사기법에 의한 강구조물의 최적설계에 관한 연구

정철원,손용우 圓光大學校 1994 論文集 Vol.28 No.2

본 연구는 구조물최적화에 있어서 가장 효과적이며 널리 사용되고 있는 직접조사기법을 사용한 강구조물의 최적비와 최소중량을 계산하는 것이다. 직접조사 반복알고리즘은 변단면 Ⅰ-형강기둥의 최소중량 값을 제시한다. 등단면기둥의 개념이 제안되며, 제안된 공식은 변단면기둥에 대한 세장비를 결정하는 공식을 제안한다. 이 조사기법은 실제설계규정에서 공식을 유용하게 사용할 수 있으며, 설계기법은 재료를 절약하는데 경제적으로 효과가 있는 것으로 평가되고 있다. This is a study on the optimum porportion of steel structures section by using direct search interation which is most efficient and widely used optimum techniques in the structure optimization. The direct search iterative algorithm is presented to find a minimum weight design of a linearly tapered Ⅰ-shaped steel column. The concepts of equivalent uniform column is defined and a predictional formular is preseted to determine the equivalent slenderness ratio for a certain linear taper of the web-depth. This search algorithm can permit the useful of the formula available in the code of design practice. A design technique is economical efficience assess the material saving.