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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.
오병환 ( Oh Byung-hwan ),유영 ( Lew Young ),최영철 ( Choi Young-chul ),이준혁 ( Lee Jun-hyuk ),김광수 ( Kim Kwang Soo ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
An effective live load model for analyzing probable maximum live load effects such as moment and shear in transverse direction was developed. The main procedure of this live load model is composed of four parts, i.e., firstly, determination of the appropriate influence lines in longitudinal direction, secondly, application of the characteristics of vehicles and traffic patterns in longitudinal direction, thirdly, determination of the appropriate influence lines in transverse direction, and fourthly, application of the characteristics of vehicles and traffic patterns in transverse direction. Through this procedure, the probabilistic distributions of maximum probable load effects are deduced in the form of probability density function (PDF) and/or cumulative density function (CDF). This live load model is able to consider local or global deterioration of bridges in the structural analysis.
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.
동적(動的) 인장하중(引張荷重)을 받는 콘크리트의 실제적(實際的)인 모델
오병환,Oh, Byung Hwan 대한토목학회 1985 대한토목학회논문집 Vol.5 No.2
동적(動的) 인장하중(引張荷重) 받는 콘크리트의 거동(擧動) 모델화(化)하기 위한 비선형(非線型) 구성이론(構成理論)이 제안(提案)되었다. 콘크리트의 정적(靜的) 인장거동(引張擧動)은 징세균열면처리론(徵細龜裂面處理論)에 의(依)하여 모델하고, 동적(動的) 인장하중(引張荷重)으로 인한 변형율속도효과(變形率速度效果)를 고려하기 위하여 유사변환을 이용(利用)하였다. 본(本) 모델의 결과(結果)를 현존하는 여러 동적(動的) 인장실험자료(引張實驗資料)와 비교하였다. 또한, 동적(動的) 인장하중(引張荷重)으로 인한 인장강도의 증가현상을 예측하기 위한 공식(公式)이 제안되었다. 본(本) 모델은 콘크리트구조물(構造物)의 좀 더 실제적인 동적(動的) 유한요소해석(有限要素解析)을 가능케 한다. Presented is a nonlinear constitutive theory which can model the behavior of concrete under dynamic tensile loads. The microcrack plane theory is introduced to describe the static tensile behavior of concrete. The affinity transformation is then employed to include the effects of strain rate due to the dynamic tensile loads. The comparisons are made with the dynamic tensile test data available in the literature. An equation is proposed to predict the strength gain due to the dynamic tensile loads. The theory allows more realistic dynamic finite element analysis of concrete structures.
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.