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방춘석(Bang Choon-seok),이준석(Lee Jun S),이희업(Lee hee-up),고동춘(Go Dong-choon) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, anisotopic yield function is proposed for the numerical analysis of reinforced tunnel ground with grouting. For this, material properties of the reinforced ground both by equilibrium as well as kinematic condition along the interface and by the mean field theory of Eshelby (1957} and Zhao (1990) are compared with each other and, as a result, the advantage/disadvantage of the proposed models are summarized. Finally, reinforced ground around tunnel with grouting is analyzed numerically. A new anisotropic yield function model is shown to be more reliable than the previous one and the predicted result is agreeable with the experimental data available.
방춘석(Bang Choon-seok),이준석(Lee Jun S.) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Long term measurement data on the bridge response caused by moving loads are fundamental ingredient to the development or improvement of the new bridge design. In addition, proper establishment of the systematic analysis and diagnosis together with the maintenance system become the essential procedure to the effective repair/reinforcement/retrofit of not only the high speed but also the conventional railway bridges. Therefore, the real time health monitoring system on the important railway bridges should be enhancing the proper maintenance of the structures. The main objective of this study is, therefore, to develop a monitoring device including Weigh-In-Motion (WIM) function and the emphasis is place on the easy and economic installation of the developed system in the field condition.
긴장력 조절이 가능한 PSC철도교량의 동적성능에 관한 연구
방춘석(Bang Choon Seok),정원석(Jung Won Seok),김현민(Kim Hyun Min),이종관(Lee Jong Kwan) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, there has been growing recognition of new-type bridges in the railway bridge engineering community in Korea. The new technology gives a more flexible possibility in terms of longer span and lower height of the girder. Under this circumstance, many new-type bridges are expected to be constructed and replaced existent railway bridges. Among aforementioned bridges, this study investigates the dynamic performance of a detensionable & retensionable prestressed concrete (DRPC) girder bridge. The basic concept of the DRPC is based on the conventional prestressed concrete girder bridge but is able to control prestressing force by introducing the secondary prestressing. A full scale DRPC specimen was constructed and modal tests were conducted to obtain the natural frequency and damping ratio of the specimen. Numerical analyses are the carried out at different constant speeds based on the measured dynamic properties. The results show that the dynamic response of DRPC bridge is well within the dynamic ranges specified in the specifications.
방춘석(Bang Choon-seok),이준석(Lee Jun S),최일윤(Choi Il-Yoon),이희업(Lee Hee-Up),김연태(Kim Yun Tae) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, two damage detection techniques are applied to the railway tunnel liner based on the static deformation data. Models based on uniform reduction of stiffness and smeared crack concept are both employed, and the efficiency and relative advantage are compared with each other. Numerical analyses arc performed on the idealized tunnel structure and the effect of white noise, common in most measurement data, is also investigated to better understand the suitability of the proposed models. As a result, model 1 based on uniform stiffness reduction method is shown to be relatively insensitive to the noise, while model 2 with the smeared crack concept is proven to be easily applied to the field situation since the effect of stiffness reduction is rather small. Finally, real deformation data of a rail tunnel in which health monitoring system is in operation are introduced to find the possible damage and it is shown that the prediction shows quite satisfactory result.
김이현(Lee Hyeon Kim),방춘석(Choon Seok Bang),신승교(Seung Kyo Shin) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
최근 철도교량은 비용절감을 위한 장지간화 및 긴장방식의 효율화를 이용한 신기술이 적용되어 다양한 형태로 시공되고 있다. 지간이40m 이내인 경우 경제성을 고려하여 주로 프리스트레스 콘크리트 거더 형식(PSC Girder)으로 개발되고 있다. 본 연구에서는 기존에 PSC거더교의 2차긴장 방식을 개선하여 개별 긴장방법을 사용하였으며 플랫덕트(flat duct)를 활용하여 정착방법을 간소화 하는 방안을 제안하였다. 대상 교량은 30m 지간의 철도교량을 대상으로 하였으며 이에 대한 동적거동을 해석적으로 분석하였다. 하중모델은 실제 운행되고 있는 KTX, EMU열차를 사용하여 최대속도까지 10km/h씩 증속하면서 수행하였다. 해석결과 제안한 형식의 철도교량은 열차주행에 대한 동적설계기준을 모두 만족함을 알 수 있었다. Recently, railway bridges are variously constructed with new technologies using long span for cost down and efficiency of prestress method. In case of below 40m span, they have been mainly applied with prestressed concrete (PSC) girder type considering economic efficiency. In this study, Individual prestress method is used improving conventional secondary prestress of PSC girder. And it is suggested simplification of anchorage using Flat duct. And dynamic characteristics of it are analyzed for 30m span railway bridges. It was performed by speed up incrementally every 10km/hr. to maximum speed of KTX, EMU train load which is actually on operation in commercial lines. It is founded that the suggesting railway bridge type is substantially satisfied with dynamic design criteria.