Research On Designing Scheme For V-shaped Continuous Steel Box Girder Bridge In High-speed Railway

With the development of the traffic enterprise in China, high speed railway and intercity passenger special railway line are faced with unprecedented development opportunity. Bridge plays an important role in the infrastructure of entire high speed railway. Among them, wide span particular bridge structures have already become one of the controlling key technology in the design and construction of the whole project.V-support structure continuous bridge is a kind of novel bridge type. Because the fulcra can reduce fulcra hogging moment and relative theoretical span effectively, there are already many successful precedents of this bridge type in highway, municipal engineering and ordinary railway. However, for usage of V-support curved steel box continuous girder in high speed railway, there shall be a certain technical complexity and innovation. This bridge type is adopted in this document for the overcrossing point of Peking super major bridge over South NO. 3 Loop Road in Jing-Hu High Speed Railway. The following work is done as emphases:1. Through landscape design of bridge structure, the rationality of usage of V-support structure bridge is analyzed and justified, so as to achieve reconciliation with surrounding environment and make the bridge a part of human landscape.2. For Four-Line Bridge, which is seldom seen domestically, several different arrangement patterns for bridge floor are compared and analyzed. The rationality of double-page single box single chamber bridge is demonstrated with consideration of construction and installation of steel structure.3. Through deck construction research and finite element computation, the orthotropic plate bridge floor and vertical and horizontal beam bridge floor are compared and analyzed and rational structural style of bridge floor is determined.4. Through the dynamic and static spatial analysis of the whole bridge structure, the economic and rational structural dimension is determined, which offers theoretical base for rigidity and strength required by transport operation.5. The detailed local stress of key part V structure of this bridge is analyzed with finite element and rational configuration measures are advanced for part with stress concentration.Through the above work, especially the profound and meticulous research on structural style, the stressing characteristic of V-support structure is basically overall mastered. This made the design economic on the prerequisite of safety and reliable and offered detailed theoretical calculation data for the stressing under different kinds of conditions, and created favorable condition for implementation of works of the next step. Meanwhile, the task and topic need further research are given.