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오병환 ( Oh Byung Hwan ),이두화 ( Lee Doo Hwa ),정원기 ( Jung Won Gi ),김지영 ( Kim Ji Young ),김승익 ( Kim Beung Ik ),박종범 ( Park Jong Bum ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
Recently, prestressed concrete box-girder bridges have been increasingly constructed in many countries. Therefore, the effective management of the bridges and the assurance of safety and serviceability is required. The conventional method considers seperately the condition assessment based on the visual inspection and the load-carrying capacity based on structural analysis without considering the degree of deterioration of the structures. To improve the current condition assessment and safety evaluation system of PSC box girder bridges, an improved performance assessment of PSC box girder briges has been proposed in this study. The proposed method considers not only inspection results but also structural performance based on degree of deterioration in order to assess the overall condition of PSC bridges.
매스 콘크리트 구조물의 연속 분할타설시의 합리적인 수화열 해석
오병환 ( Oh Byung-hwan ),전세진 ( Jeon Se-jin ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
The mass concrete structures are generally constructed in an incremental manner by deviding the whole structures by a series of many blocks. The temperature and stress distributions of any specific block are continuously affected by the blocks placed before and after the specific block. For an accurate analysis of mass concrete structures, the sequence of all the blocks must be accordingly considered including the change of material properties with time for those blocks considered. The purpose of this study is to propose a realistic and efficient analysis method which can take into account not only the influence of the sequence, time interval and size of concrete block placement on the temperatures and stresses, but also the change of material properties with time by the minimum number of blocks.
내부그라우팅으로 미세균열이 보수된 철근콘크리트 시공이음부의 역학적 특성에 관한 연구
오병환 ( Oh Byung-hwan ),김세훈 ( Kim Se-hoon ),이근희 ( Lee Keun-hee ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.1
Grouting internally with grout materials can repair the micro-cracks and micro-voids of construction joints more efficiently than injecting grouts from the surface of cracks. A new internal grouting method using perforated bundled-cables was developed in this study to enhance the structural integrity of the construction joints. The extensive experiments were performed to examine the mechanical behavior of construction joints which are repaired internally by the developed method. The tests were conducted for rectangular-shaped box wall structures and straight wall structures. The strength and permeability tests at grouted construction joints were conducted to evaluate the structural behavior of repaired construction joints. The present study indicates that the internal grouting method developed in this study enhances greatly the performance of construction joints and may be efficiently used for the leak-tight integrity of construction joints in concrete structures.
초음파 펄스를 이용한 철근콘크리트 구조물의 균열 깊이 측정에 관한 연구
오병환 ( Oh Byung-hwan ),김지상 ( Kim Zi-sang ),김세훈 ( Kim Se-hoon ),백낙승 ( Paek Nak-seung ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
Ultrasonic pulse velocity method is employed for evaluation of crack depth in concrete structures. Due to the heterogeneous nature of concrete and the indirect transmission arrangement for the transit time measurement through the surface-opening cracks in concrete structures, ultrasonic pulse velocity has so many variations as crack depths and transmission length vary. In this study, ultrasonic pulse velocity method is investigated to evaluate the surface-opening crack depth of concrete slabs, reinforced concrete slabs, reinforced concrete flexural members. A resonable method is presented to detect the crack depth of concrete structures.
편심을 가진 연속강선으로 보강된 프리플렉스 거더교량의 해석 및 실험 연구
오병환 ( Oh Byung-hwan ),정효정 ( Jung Hyo-jung ),진남희 ( Jin Nam-hui ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
In 1980s, the preflexed composite bridges were introduced in Korea and have been applied widely, then in mid 1990s, the new construction technology, RPF(Re-prestressed Preflex) composite bridges were developed because of the cracks in existed PF bridges due to the prestress loss at the support and the increased height of cross-section. The RPF bridges are composed with the high strength concrete and unbonded PS strands properly in especially upper part of the structures to improve these defeats of PF bridges. We propose the recommendable construction method of continuous RPF bridge within this research. This research involves experimental tests performed in the real bridge applied by the continuous RPF method, and the tests were conducted from the first stage of construction to the service load stage. Through the tests we could verify the developed continuous RPF bridge construction method.
풀스팬 프리캐스트 세그먼트 교량의 해석 및 장기거동 해석
오병환(Oh Byung-Hwan),채성태(Chae Seong-Tae),정상화(Jung Sang-Hwa),박지언(Park Ji-Eon) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
The newly proposed Precast Segmental Method (PSM), which makes use of precast elements for election, is relatively new, efficient and fast method for the construction of prestressed box girder bridges. A precast segment of 25 m long pretensioned in the fabrication yard is transported by a special trailer and a launching truss to its final position. The segments are then connected in the site by post-tensioning to make a continuous prestressed concrete box girder bridges. The purpose of this paper is to analyze and evaluate the design of precast prestressed concrete box girder bridges. The detailed analyses including time-dependent behavior of PSM bridges are conducted. The major results and findings, which have been obtained from finite element analysis of PSM bridge, are discussed in this paper and these results will be a good base for the design and analysis of a new precast bridges.
고강도 콘크리트 및 고강도 철근을 사용한 고교각의 거동에 관한 실험적 연구
오병환 ( Oh Byung Hwan ),조근호 ( Cho Keun Ho ),박대균 ( Park Dae Kyun ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
The purpose of this study is to investigate the behavior of RC high-pier using the high-strength concrete and the high-strength rebar. Six RC piers(45×45×350cm) were tested under constant axial load and cyclically reversed horizontal load. The parameter of the test were concrete compressive strength and steel strength. The concrete strength varied from 24 to 60 MPa and the reinforcement of SD300, SD400 and SD500 steel rebars were used. All specimens were designed on the current seismic design code. The test results indicate that RC pier of the high-strength concrete and high-strength rebar exhibited ductile behavior enough to satisfy the current code provisions for seismic performance.