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서재원(Seo Jae-Won),강덕만(Kang Duk-Man),김만철(Kim Man-Cheol),박용걸(Park Yong-Gul) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In fact, the design of railway bridge in which static load is applied to impact factor has been considered dynamic behavior applied safety factor. In other words, this design excessively increases stiffness of bridge as applying the inefficient large section. In addition, Rahmen bridge is slightly influenced on dynamic effect, because Rahmen bridge as combined structure without shoes is constructively different from reinforced concrete and prestressed concrete bridge. Especially, it is irrational to adjust large impact factor on the Rahmen Bridge which has short span. In domestic and aboard design criteria, impact factor quoted by criteria of railway bridge(2004) is larger than it quoted by Ho-Nam high-speed criteria(2007), and it is prescribed in the rules of the association that it is applied to larger than it on design criteria of Europe and Japan. This paper performed parametric study about span length, train velocity, and train types. Also, the impact factor criteria on the Rahmen bridge was estimated by comparing and analyzing domestic criteria with aboard design criteria. In the result of this study, the impact factor of domestic design criteria which was applied to Rahmen bridge estimated to have the enough safety factor. Therefore, It proposes rational and economic expression of the impact factor for the Rahmen bridge.
[미발표] PSC Edge Girder를 활용한 하로형 신형식 철도교 개발
김도학(Do Hak Kim),신명규(Myoung Gyu Shin),이재호(Jae Ho Lee),강덕만(Duk Man Kang),김성재(Sung Jae Kim),박성민(Sung Min Park) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10
U형 PSC 하로교는 궤도면고의 하향조정에 따른 형하공간 확보에 용이하며, 노선의 급격한 종단 경사를 피하여 열차의 운전효율을 증대시키는 등 철도교량으로서 많은 장점을 가진 교량 형식이다. 하지만 U형 PSC 하로교 시공을 위해 현재 주로 사용되고 있는 Precast Segment Method는 Segment의 운반 및 가설을 위한 대형 장비가 필요하여 시공비용이 증가하는 단점이 있다. 본 연구에서는 U형 PSC 하로교의 측벽을 이루게 되는 Edge Girder를 먼저 가설하고, 설치된 Girder 사이에 슬래브 및 가로보를 현장타설하여 U형 PSC 하로교를 시공하는 신형식 교량을 개발하였다. 본 논문에서는 개발된 교량의 개요와 시공방법, 그리고 최적 단면을 선정하는 과정을 소개하였다. U-type PSC through bridge type has many benefits as railway bridges. It makes the level of the rail track move down and is advantageous to secure spaces under the girders. And it also makes avoide rapid longitudinal slope of the railway, and the driving effectiveness of the railway is increased. Precast Segment Method is typical method to construct U-type PSC through bridges. However, this method causes expensive construction cost for needs of heavy equipment to transfer and install the segments. New bridge type developed in this study is constructed to first install the edge girders and make slab and cross beam by in-situ concrete. This makes improve the weakness of the existing construction method. This paper presents the concept of the proposed railway bridge type and the decision of the optimal cross section.