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.

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.

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.

퍼지집합론을 이용한 건설공사의 위험도분석 평가

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

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.

북한의 정상국가화를 위한 우리의 안보전략

손용우 한반도선진화재단 2014 선진화 정책시리즈 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.

교량케이슨기초의 최적신뢰성 설계규준

손용우,신형우,이증빈,정철원 圓光大學校 環境建設硏究所 1992 環境建設論文集 Vol.1 No.-

This study is directed to propose a stability and Design Criteria for Bridge Caisson For Bridge Caisson foundations, with Could possibly replace the traditionals W.S.D provsions of the Current Code, based on the LFBOR (Load Factors Base on Reliability). The optimum reliability indices(Verticial bearing Capacity: β_opt=3.19, Lateral bearing Capacity: β_opt=3.15(ordinary), β_opt=2.93(earthquake), Shearing resistance Capacity: β=2.87) are Selected as optimal Values Considering our practice base on the Calibration with the current Bridge Caisson foundation design Safety provisions, Load and Resistance Factors are measure by using the proposed uncertainties and selected optimum reliability indies. Furthermore, a set of nominal safety factors are proposed for the U.S.D design provisions

2021년 경남지역 소바이러스성설사 바이러스(BVDV) 감염실태 조사

손용우,조성희,지정민,조재규,방상영,최유정,김철호,김우현,Son, Yongwoo,Cho, Seonghee,Ji, Jeong-Min,Cho, Jae-Kyu,Bang, Sang-Young,Choi, Yu-Jeong,Kim, Cheol-Ho,Kim, Woo Hyun The Korean Society of Veterinary Service 2022 韓國家畜衛生學會誌 Vol.45 No.3

Bovine viral diarrhea (BVD) is one of the problematic wasting diseases in cattle leading to huge economic losses. This study was conducted to investigate the prevalence of BVD including transient and persistent infection from cattle farms in Gyeongsangnam-do. A total of 2,667 blood samples from 24 farms were collected and the sera were subjected to ELISA to detect BVD virus (BVDV) antigen, E^rns. 5' untranslated region (5'-UTR) of BVDV-positive samples was sequenced to identify the genotype, and compared with isolates previously reported elsewhere. There were fourteen BVDV-positive calves from 2,667 samples (positive rate: 0.52%) from first ELISA testing followed by eight persistently infected out of eleven BVDV-positive samples (72.73%) in secondary ELISA that was conducted in at least four weeks suggesting the circulation of BVDV in the area. Sequencing analysis exhibited that thirteen BVDV-positive samples were identified as BVDV-1b and one sample was BVDV-2a. Phylogenetic analysis revealed that the BVDV-1b-positive samples showed the highest homology in nucleotide sequence to Korean isolates collected from Sancheong, Gyeongsangnam-do, while the BVDV-2a-positive sample (21GN7) was more similar to reference strains collected outside South Korea. This study will provide the recent fundamental data on BVD prevalence in Gyeongsangnam-do to be referred in developing strategies to prevent BVDV in South Korea.