Research On Structure System Of Long-Span Railway Suspension Bridge And The Influence To The Stiffness

Railway construction is inevitable to cross a series of wide rivers. Sometimes, long-span railway bridges may be considered. Suspension bridge is famous for its powerful capability to cross, because the main load-bearing component of which is the cable which made of high-strength steel wire. So long-span railway suspension bridge is the best choice for long-span railway bridge. While suspension bridge has been successfully applied to the railway, the main factor which restrict it to develop more longer is the stiffness. With the development of the economic power and the urgent need for sea transport, it is necessary to have a deep research on the stiffness of long-span railway suspension bridge. The research objects of this paper are three long-span railway suspension bridges in Japan, lateral stiffness and vertical stiffness are analyzed through establishing the finite element model of which. The Research methods and conclusions are as follows:By analyzing the stiffness values of long-span railway suspension bridges have been built and related specifications, the index and reasonable values of the stiffness for long-span railway suspension bridge is presented. The result may have some reference value to preliminary design of long-span railway suspension bridge.By changing overall layout, the paper analyzes the factors to influence the stiffness which include sag to span ratio, sidespan-midspan ratio, depth-span ratio, width-span ratio and support system of the stiffening girder and so on. From which, effective measures to improve the stiffness of long-span railway suspension bridge are acquired.Given the current development trend of long-span railway bridges, a design proposal for long-span railway suspension bridge are proposed to built. By adjusting the overall layout and structure system which include cable-stayed suspension combined system bridge and double cable suspension bridge, the stiffness of the newly-built bridge is controlled within a reasonable range. The result may have some reference value to improve the stiffness of long-span railway suspension bridges that will be built.