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- Title
高速铁路大跨度连续斜拉桥上梁端一体化装置性能研究.
- Authors
周智强; 邢书科; 王兆刚; 孙洪斌; 董昆灵; 杨荣山
- Abstract
At present, when continuous welded rail are laid on long-span cable-stayed bridges, the bridge end expansion device and rail expansion regulator should be set at the bridge end to reduce the large additional stress caused by the rail. However, this structure cannot coordinate the large relative displacement of bridge and rail and its application range is limited. Therefore, designers put forward a kind of bridge end integration device structure, which is suitable for the large bridge seam expansion with small expansion resistance and good field application effect. Aiming at the requirement that the highspeed train can pass the bridge end of the seamless line of the long-span cable-stayed bridge smoothly at 350 km per hour, this paper establishes the relevant three dimensional bridge end vehicle-rail-bridge coupling model, determines the wheel-rail contact relationship, and verifies the applicability of this structure for the stable operation of high-speed train under the long-span cable-stayed bridge. The results show that the rail deformation will occur under the action of temperature and angle of the bridge end. The vertical deformation of rail is greater than the transverse deformation, and the maximum vertical displacement reaches 15. 71 mm. By comparison, the dynamic response of the bridge end integration device during the driving process increases when only the German low interference irregularity spectrum is applied; the superposition temperature or the angle of bridge end deformation is applied, and the influence on the vertical acceleration of the steel pillow bar vibration is obvious, which increases from 38. 92 m·s-2 to 48. 69 m·s-2, with an increase of 25. 1%. In contrast, the structural response of the bridge end integration device in the ultimate tensile state is larger than that in the ultimate compression state. The vertical acceleration of the steel bolt rises from 40. 64 m·s -2 to 62. 39 m·s-2, with an increase of 53. 5%. The performance of the bridge end integration device should be regularly tested under high temperature tensile state. The responses of the bridge end integration device under the above working conditions all meet the standard specifications. This study can provide a reference for the laying of the beam end when the train runs at high speed through the end of the long-span cable-stayed bridge.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p63
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202208030003