Mixed Beam Cable-stayed Bridge Train Take The Feasibility Study

As cable-stayed bridges develop towards long span, the application of hybrid girder cable-stayed bridge has been increasing gradually due to its excellent mechanical properties and economics.The hybrid girder cable-stayed bridge has excellent dynamic and static mechanical properties.Therefore it's a bridge with reasonable force and beautiful layout.Based on YongJiang hybrid girder cable-stayed bridge in NingBo, this paper has analyzed the vehicle-bridge coupled vibration and influences of dynamics factors.The main research can summarized as follows:Firstly, analysis model of train-bridge time varying system is established. The natural vibration frequencies are calculated and according to the vibration modes, the dynamic characteristics of the bridge and dynamics factors (structural system, position of steel-concrete join, numbers of auxiliary piers) have been studied.Secondly, based on the above bridge model,the paper comparatively analyses the dynamic response of the bridge and vehicle (C62 wagon, SS8 passenger coach and domestic force)at different speeds in two service stages, which are the passenger and freight traffic stage and the passenger stage.It comes to the conclusion:the security of moving train can be assured.At the same time, the dynamic response of the steel-concrete join is emphatically analyzed.The analysis shows that its displacement and time curves transit smoothly.Thirdly, by means of the parameter analysis of the hybrid girder cable-stayed bridge,effects of the change of the structural system, position of steel-concrete join and numbers of auxiliary piers, evaluations on the dynamic response of the bridge and vehicle were made respectively, and various parameters on the bridge and vehicle dynamic response are analyzed.Finally, coupling vibration of the long-span cable stayed bridge of floating system with shock absorbers is analyzed.Influences of elastic cable and Lock-Up Device on bridge vibration response of this cable-stayed bridge are researched. The results showed that setting elastic cable reduced the longitudinal displacement of main beam and top of the tower. Coupling vibration of this cable stayed bridge of floating system with shock absorbers have been calculated with the transient consolidation system. The results showed that the security of moving train can be assured.