• 한국방재학회:학술대회논문집
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• 2010.02a
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• pp.77.2-77.2
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• 2010

고속열차(KTX)를 지지하는 구조물은 차량과 지속적인 접촉을 갖는 구조를 가지고 있으므로 고속열차의 운행 안정성(동적거동)을 고려한 설계가 필요하다. 또한, 상부 구조물은 고속열차의 연행이동집중하중을 지지하며, 이러한 하중조건을 갖는 차량이 운행할 때 상부 구조물은 설계 기준사항들을 만족해야한다. 호남고속철도 설계지침에 의하면 고속열차(KTX)의 운행 안정성을 평가하기 위한 항목들로 대상 교량의 고유진동수, 상판 수직가속도, 면틀림 그리고 승차감을 고려한 연직처침 등이 요구된다. 따라서, 본 연구에서는 KTX의 실 열차하중을 고려하여 연행이동집중하중으로 아치 교량의 동적거동을 검토하였으며, 호남고속철도 설계지침을 적용하여 대상 교량의 운행 안정성을 평가하였다.

• Proceedings of the KSR Conference
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• 2001.05a
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• pp.257-264
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• 2001

국내 고속철도 강합성 교량이 경부고속철도 8-2공구에서 처음으로 시공완료 되었다. 그동안 수년간에 걸쳐 고속철도 교량시공에도 불구하고 강합성 교량이 적용되지 못했던 것은 설계 기술적인 면과 더불어 재료 적인 면에서 국내여건이 성숙되지 못한 요인이 크다고 보여진다. 본 고에서는 기 설계된 PC BOX교량중 지형여건상 강합성교량이 적합한 교량구간을 제시하였다. 또한 강합성 교량의 설계기술적인면 중 특히 중요한 한국형 TGV차량의 동적 하중의 적용과 그에 따른 구조물 거동의 평가를 1＠50 교량에 대한 8-2공구 사례를 통하여 논의하였다. 강합성 단면은 단순 2주형 주형거더(double I beam)이며 플랜지 두께는 최대 80-100mm가 적용되어졌다. 본 단면에 대한 HL차량하중등에 대한 정적해석을 통하여 관심이 되고 있는 플랜지등의 응력 검토결과를 보여주었다. 아울러 정적해석과 동적해석의 결과치를 비교하여 국내 시방서에 제시된 고속철도 HL차량하중에 대한 평가도 이루어졌다. (중략)

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1119-1124
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• 2004

Full depth precast concrete bridge deck system can be advantageously to reduce construction time, hence lowering the cost. This system has several significant design and construction component. To connect between the concrete slab and steel girder, precast deck has shear pocket. Post-tensioning tightens the joints and prevents any leakage though the joint. When post-tensioning is applied, stress concentration occurs in the edge of shear pocket. In this study, precast decks using four types of shear pocket is analyzed by F.E.M.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.977-981
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• 2004

Variety of recent railroad markets arouses the need for steel sleepers. Steel sleepers have many advantages over conventional timber or PC sleepers with respect to safety, environment and economical efficiency due to less effort for maintenance. Weak points of timber sleepers are to cut trees and apply toxic creosote as well as to need frequent maintenances while it is difficult to apply PC sleepers to steel bridge or crossing and to recycle them completely. In this paper, technical trends are analyzed in order to develop suitable steel sleepers for domestic railroads.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.971-976
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• 2004

The management of railroad structures is more difficult and complicate because there are many structures such as rail, bridge, tunnel, station, and so on. Therefore, LCC(Life Cycle Cost) analysis of railroad structures as public infrastructure must contain a maintenance cost as well as an initial cost in order to make a more effective management during the life cycle on the design phase. This paper presents a cost classification scheme considering user costs such as value of delayed time of passenger and freight. Also, in this study it is developed a probabilistic life cycle cost(PLCC) analysis model of railroad structures taking into account uncertainties and variations of input variables in order to analyze LCC. It may be stated that the model proposed in this study can greatly contribute to the making optimal decision, the estimate of the maintenance cost and the allocate of budget in the project of railroad structures.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.988-993
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• 2004

This paper considers corrosion problems in the bolt connection of weathering steel box girder bridge using the external electric type corrosion resistance method which resisted to local corrosion in coated steel surface with contacted air. The weathering steel was created a rust itself in the passive state. but a coated box girder type was easily dew form could be made galvanic cell that accelerated corrosion. so that it was ruled by protection coat with some paint. Therefore, it needed that can be applied the external electric type corrosion resistance method in coated surface. As a result of the test of polarization amount had measured that the weathering steel was higher currents than the general steel by about $5\~10\%$. Therefore. an external electric type corrosion resistance method can be used to protect local corrosion in the coated bolt connection of weathering steel box girders effectively.

• Proceedings of the KSR Conference
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• 2002.10b
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• pp.1100-1105
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• 2002

The elasticity of the contact wire is one of important static parameters for the catenary system. This paper presents how to analyse the elasticity of the catenary system using both simple string model method and finite element method with their formula. Analysis results obtained by these two methods for KTX catenary system are compared. A measurement of the elasticity for the KTX catenary under construction which is located near Kumkang bridge is made for the comparison with the analysis results. Both a dynamic and a static methods are tried for the measurement. Because of wave propagation, the dynamic method with 5 km/h running presented an asymmetric variational pattern of the elasticity while the static method presented a symmetric pattern of the elasticity in the span. Measured elasticity using the static method is found to be a little higher than the analysis results. But, the static method can presented us a variational pattern of the elasticity in the span similar to the analysed results. Therefore, the static method can be used for evaluating the elasticity of the catenary system

• Proceedings of the Korea Concrete Institute Conference
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• 1998.10b
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• pp.615-620
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• 1998

The objective of this experimental study is to investigate the hysteretic behavior of reinforced concrete piers subjected to quasi-static cyclic loads, which have been used in large numbers for railway and urban transportation facilities. Important test parameters are hoop ratio, axial load, loading type, and the behaviors f members have been evaluated through limit states of crack occurrence, yielding and ultimate state of member, ductility and load-deflection loop can be secured by considering the influence of hoop reinforcement ratio and axial load, and that plastic hinge length and ductility ar determined by the combination of the quantities of hoop reinforcement and axial load.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.382-387
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• 2003

This research has investigated structural characteristics of curved two girder bridges proposed for AGT system and analyzed the results of the structural analysis of three different modelings for 3 span continuous bridge, each modeled in grillage modeling, simplified 3D modeling, and detailed 3D modeling respectively. The grillage modeling appeared to be somewhat underestimated in deflection and overestimated in rotation with respect to 3D modelings. Also, it is impossible to make a detailed examination of local buckling and details of cross beams, etc. The point that warping effect cannot be considered may cause the structural analysis unsafe, accordingly the structural analysis of curved two girder bridges should be done with 3D modelings.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.356-363
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• 2003

The CWR of the plate girder bridges in non-ballast causes the additional axial force on the rail and the bearing due to the temperature axial force and the interaction between the CWR and bridges. This study shows the remarkable improvement of reducing the axial force of the CWR on the non-ballast bridge, compared to conventional methods. New method, which is differently designed in terms of longitudinal semi-rigid bearing, reduces the axial force on the bearing by making the girder act both directions. This method is applicable to most cases of bridges regardless of the restriction of length, and useful to reduce the abrasion and damage of the track material.