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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.
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.
폐광의 점진적 파괴 및 뒷채움 효과에 대한 해석적 연구
이준석,방춘석,Lee, Jun-Suk,Bang, C.S. 한국터널지하공간학회 2000 터널기술 Vol.2 No.2
지하채굴작업에 의한 공동 및 폐갱 등은 지반침하 및 지표함몰현상의 주요 원인이 되며, 근접시공 지하구조물 또는 인근 구조물의 안정성 저해요소로 대두되고 있다. 이에 대한 대책방안으로 폐갱을 충진재로 채우는 보강시공을 수행하는 경우가 있으나 설계방법 및 안정성 해석방법이 미흡한 실정이다. 따라서 본 연구에서는 폐갱 등 지하공동에 의한 주변지반의 영향권을 수치적으로 분석하고 실제 수치해석 과정에서 주변 암반의 장기거동을 고려할 수 있는 방안을 제시하였다. 아울러 폐갱 인근의 구조적 안정성을 향상시키기 위하여 지하공동을 뒷채움재로 충진한 경우, 안정성 평가 및 암반의 거동을 수치적으로 분석할 수 있는 기법을 제시하였으며 불완전한 뒷채움재의 영향을 함께 고려하였다. The abandoned mines causing settlement of the surface above and collapse of the cavities are the major influencing factor on the stability of the nearby underground structures. To prevent the harmful effect, the backfill methods are commonly applied to the cavities although the design criteria and the analysis method are not properly addressed in some cases. An approximate analytical method together with the numerical technique is considered in this study to simulate the gradual deterioration of the rock masses around the cavities and, therefore, the influential zone to the underground structures passing through the cavities. Also considered in this study is the backfill effect on the stability of the rock masses around the cavities. Specifically, the incomplete backfill effect is compared with that of the idealized backfill method by adopting elasto-plastic analysis involving a strain softening material law.
이준석,방춘석,최일윤,엄주환,Lee, Jun Seok,Bang, Chun Seok,Choe, Il Yun,Eom, Ju Hwan 한국터널지하공간학회 1999 자연, 터널 그리고 지하공간 Vol.1 No.1
The Grout-reinforcement technique which is widely used during the excavation of a shallow or an endangered tunnel can be classified into a couple of groups according to the properties and injection methods of the grout. The reinforcement design will, therefore, take a different approach based on the grouting method under consideration. However, the injection procedure is mainly performed by the experience of the foreman rather than engineering judgement , specifically the permeation grouting through the rock joints and its reinforcement effect Is not fully under-stood during the design stage, In this study, the anisotropic material properties of the grout-reinforced rock masses are derived from the concept of composite materials and the effect of intact rock, vertical grouting and permeation grouting is, therefore, fully accounted for. Through the parametric studies on the characteristics of rock joints, intact rock and grouting materials, various case studies have been considered. The results, illustrated via the design charts, can be directly used during the reinforcement design.