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양신추,윤정방,Yang, Sin Chu,Yun, Chung Bang 대한토목학회 1991 대한토목학회논문집 Vol.11 No.3
본 논문에서는 무한요소를 이용한 지반-구조물 상호작용 해석에 대하여 연구하였다. 적층지반(Layered Soil)과 같이 여러 가지 응력파가 동시에 전파되는 탄성지반의 외부영역을 효과적으로 모형화할 수 있는 동적무한요소를 개발하였으며, 요소행렬 구성시 수반되는 무한대 방향으로의 적분을 효과적으로 수행하기 위하여 Gauss-Laguerre 적분방법을 기초로 하여 새로이 고안된 적분방법을 제시하였다. 이 방법의 타당성은 반무한 탄성지반과 적층된 반무한 탄성지반 위에 놓여 있는 원형강판의 임피던스(Impedance) 함수를 구하여 해석적으로 구한 값들과 비교함으로써 검토하였다. This paper presents dynamic infinite elements for soil-structure interaction analysis. In order to discretize the far field of the unbounded soil media, axisymmetric infinite elements which are capable of propagating multi-waves are proposed. An efficient numerical integration scheme for constructing the element characteristic matrices of the infinite elements in developed based on Gauss-Laguerre quadrature. The efficiency of the infinite elements is demonstrated by comparing the computed impedances of rigid circular footings on an elastic half space and on a layered half spaces with those obtained analytically.
양신추(Yang Sin-Chu),신정렬(Shin Jeong-Ryol),정우진(Chung Woo-Jin) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
With speed-up of existing railway, a greater attention is paid to the riding safety and the comfort of the passengers. They are combined to some technical factors related to track such as alignment, derailment coefficient, and track bearing capacity. A quantitative analysis method for those technical factors is presented in this study. Calculating the allowable transit speed, the technical reviews of speed-up of Janghang-Line(Chunan~Janghang) are conducted. And the alternatives for improving train speed in existing railway are proposed.
현장계측 및 시뮬레이션 조합에 의한 철도지반진동예측기법 개발
양신추(Sin Chu Yang),황성호(Sung Ho Hwang),장승엽(Seung Yup Jang),김은(Eun Kim) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.4
Considering a countermeasure against vibration along the existing line, in many cases, it may be the most efficient method to replace existing fasteners with high resilient fasteners because of the restriction of the construction of a new track type. There are many types of high resilient fasteners which are different in price and performance. Therefore it is important to choose the high resilient fastener which has best vibration-proof performance per price. In this study, a prediction method which can exactly evaluate the performance of a fastener in the reduction the ground borne noise in the existing line is presented, which is constructed based on the combination of the measurement and the simulation. A numerical example using the presented method is introduced to evaluate the vibration-proof performance for the solution of the vibration problem in the existing line.
장대교량 신축부에서 침목간격 확대가 차량의 주행안전성 및 궤도의 구조안정성에 미치는 영향
양신추(Sin-Chu Yang) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.9
Long continuous bridge deck can become contracted considerably as temperature drops, which can lead to a large expansion of sleeper span at the end of it. Since this huge sleeper span then can cause problems both with safety of train operation and structural stability of tracks, it is necessary to take the issue into consideration systematically in the designing process of the bridge. In this paper, an evaluation process through the analysis of train-track interaction was presented which can basically review the effects of the expansion of sleeper span at the end of long continuous bridge deck on the safety of the train and the structural stability of the track. The analyses of the interaction between the light rail train and tracks were carried out targeting the sleeper span as a main parameter. The safety of train operation and structural stability of tracks in a light rail system due to the expansion of the sleeper span were evaluated by comparing the numerical results with the related criteria.
양신추(Yang sin-chu),이진욱(Lee Jin-Wook),나성훈(Na Sung-Hoon) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper investigates about the prediction of rail bending fatigue lifes for the purpose of the effective maintenance of surface irregularities of rail welded parts. The rail bending stresses are calculated using a track dynamic analysis program. The rail surface irregularities measured in situ are given as inputs in the analyses. On the other hand, the S-N curves are derived based on the results of bending fatigue tests. Using data found so far, rail fatigue lifes are estimated adopting a modified Miner"s rule. The useful guides for maintenance of rail welded part are proposed in terms of grinding period and grinding depth of rail surface irregularities.
양신추(Yang Sin-Chu),김은(Kim Eun) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In order to guarantee the economical efficiency in railway track, it is very important to determine the fastener stiffness which is capable of minimizing the total cost which consists of the cost of electric energy dissipated due to traction and track maintenance cost. In this study, the methods evaluating the energy cost and the maintenance cost with the track stiffness in the concrete track of high speed line are respectively presented. The optimal value for the vertical track stiffness is sought out by handling the previously established parallel equations corresponding to the respective costs. The optimal vertical dynamic stiffness of rail pad in concrete track of high speed line is evaluated as 33.6 kN/㎜. It is notified that this value is internationally in the range of common use in the design of HSR concrete track.