• Proceedings of the Korean Institute of Industrial Safety Conference
• /
• 2000.11a
• /
• pp.176-182
• /
• 2000

철도교에서 철도역사의 경우 도로교와 달리 승객의 이동시 필요한 승강장이 존재하기 때문에 승강장의 통로를 위해 개구부가 존재할 수밖에 없다. 따라서 철도교의 철도역사에 대한 구조해석 시 슬래브에 위치한 개구부에 대한 고려가 필수적이다. 그러나 최근까지의 철도교의 철도역사에 대한 구조해석은 2차원 평면 해석에 의존하는 경우가 많아서 개구부에 대한 고려가 없거나 소홀했던 것이 사실이다.(중략)

• Proceedings of the Korean Institute of Industrial Safety Conference
• /
• 2000.11a
• /
• pp.183-190
• /
• 2000

철도교는 도로교와 달리 하중조건이 매우 다양하고 복잡하다. 특히 열차에 관계된 하중들은 일반적인 모델링에 대해 하중을 재하하기가 까다로울 뿐만 아니라, 그 해석 결과를 실 구조물의 설계에 반영하기에는 많은 논란이 되고 있다. 이에 본 연구에서는 철도교의 설계시 사용되는 열차에 관계된 하중들의 산정방법과 구조해석 모델링에 이러한 하중들을 재하하는 방법의 변화에 따른 구조해석 결과를 비교, 검토함으로써, 앞으로 수행되는 철도교의 설계에 기초자료를 제공하고자 한다.(중략)

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.26 no.3D
• /
• pp.499-509
• /
• 2006

Precast concrete deck has many advantages comparing with the in-situ concrete deck, and has been successfully applied to replacement of the deteriorated decks and to the newly constructed highway bridges in domestic region. In order to apply the precast decks into the railway bridges, however, differences of the load characteristics between the highway and the railway should be properly taken into account including the train load, longitudinal force of the continuous welded rail, acceleration or braking force, temperature change and shrinkage. Proper level of the longitudinal prestress of the tendons that can ensure integrity of the transverse joints in the deck system is of a primary importance. To this aim, the longitudinal tensile stresses induced by the design loads are derived using three-dimensional finite element analyses for the frequently adopted PSC composite girder railway bridge. The effect of the temperature change is also investigated considering the design codes and theoretical equations in an in-depth manner. The estimated proper prestress level to counteract those tensile stresses is above 2.4 MPa, which is similar to the case of the highway bridges.

• Journal of Korean Society of Steel Construction
• /
• v.22 no.1
• /
• pp.13-20
• /
• 2010

Seismic risk assessment of railway bridges is an important issue for a transportation network, because loss of functionality of railway bridges could result in severe disruption of the railway line, as no redundant routing systems generally exist. Although many studies have been conducted by numerous researchers regarding fragility analyses of bridge structure, little or no studies have been done for fragility analyses of a class of bridge structures considering their geometric variability. This study performs a fragility analysis for Track-on Steel-Plate-Girder (TOSPG) railway bridges in Korea considering their span variability. Seismic fragility curves are developed for a series of bridges with different spans varying from 2 to 15. At last, the fragility curves for the whole TOSPG bridges in Korea are also developed using the total probability theorem. This study is expected to effectively contribute to the seismic risk assessment of railway lines, where a number of bridges are present.

• Railway Journal
• /
• v.18 no.1
• /
• pp.35-41
• /
• 2015

• Railway Journal
• /
• v.17 no.6
• /
• pp.45-57
• /
• 2014

• Railway Journal
• /
• v.18 no.2
• /
• pp.54-70
• /
• 2015

• Railway Journal
• /
• v.15 no.3
• /
• pp.27-31
• /
• 2012

• Journal of the Korean Society for Railway
• /
• v.16 no.5
• /
• pp.394-401
• /
• 2013

Here we report the results of an experimental laboratory test to verify the applicability to railway bridges of a PSC I girder of which the upper flange thickness was increased to improve sectional performance. The thicker this flange is, the further upward the neutral axis is moved. If in this way the span length can be increased to 40m long, the bridge may be constructed with four girders instead of five. Therefore, construction cost could be lowered by reducing the weight of the long span structure due to increased sectional efficiency. It was also necessary to be certain that the dynamic performance of this relatively flexible structure would be applicable to railway bridges. Therefore numerical analysis, as well as static and dynamic tests, was carried out for a full-size PSC I girder. Based on these results, it was verified that the performance of the PSC I railway bridge satisfied the performance criteria of the design code.

• Journal of the Korean Society for Railway
• /
• v.11 no.5
• /
• pp.489-498
• /
• 2008

In general, deflection limit criteria of bridge design specifications have been considered based on static serviceability and structural stability. Dynamic serviceability induced from bridge vibration actually has not been included in the criteria. Thus, it is necessary for deflection limit to be considered in order to check dynamic service- ability on bridge vibration. In this study, The allowable displacement of Korea Railway Bridge Design Specifications is compared to the frequency domain comfort limit and analyzed france code and japanese code. Korea Railway Bridge Design Specifications is regulated based on the train speed. Such is because the vibration time duration is partly considered. but this criteria is not satisfied with comfort limit. and, it is estimated to be capable to provide deflection limit considering dynamic serviceability. In order to evaluate the dynamic serviceability of various types of railway bridges in current public were selected and their dynamic signals were measured. and the result of the bridge-train interaction analysis according to the changes in bridge stiffness was compared to the comfort limit to suggest the stiff-ness limit to the dynamic serviceability, which should conveniently be applied at the field.