Seismic Analysis Of Multi-pylon Cable-stayed Bridges With Corrugated Steel Webs

The PC composite box girder with corrugate steel webs is applicable to bridges with a variety of structure types, which exhibits superior durability and economic features compare with the common concrete box girder. The multi-pylon cable-stayed bridges with corrugated steel webs is regarded as the type of structure where composite box girder with corrugate steel webs is ingeniously used, making better use of the properties of the two structures. The main navigational bridge of Chaoyang Bridge in Nanchang is a continuous composite box girder cable-stayed bridges with corrugate steel webs, its has six pylons and the stay cables are arranged in single cable plane,the multi-pylon cable-stayed bridges model based on Chaoyang Bridge built by Opensees will be analyzed.Firstly,this paper takes Nanchang Chaoyang bridge corrugated steel web plate tower cable-stayed bridge as the research object and adopts ETABS and Opensees to analyze the natural vibration characteristic of column, beam, pier beam consolidation separation system cable-stayed bridge.In order to find how the bridge bracing longitudinal stiffness system impact on cable-stayed bridge structure,it analyze the dynamic characteristics of the structure under four working condition.Secondly,two analysis models of the bridge with LRB and the bridge without LRB are founded,the Steel02 material is adopted to simulate the hysteric characteristic for LRB.Two isolation cable-stayed bridge model is established with using the software and making the analysis of time-history to prove the validity of the model.The influence of stiffness ratio on bridge seismic isolation effect were discussed.Combing numerical example and input of El-Centro 、 Tianjin and Taft seismic waves to the two computation models time-history contrast analysis was carried out.Finally, In order to provide a reference for seismic design of long-span cable-stayed bridge.The model of the bridge are founded,Dynamic finite element model is established and dynamic characteristics is analyzed.The study on seismic response of the long-span cable-stayed bridge under the traveling wave effect which based on displacement input method.Result shows that the bridge bracing longitudinal stiffness setting system impact little to the vibration of the beam and column;LRB is remarkable effective on isolation and couldeffectively reduce the seismic response of the cable-stayed bridge.The stiffness ratio on cable-stayed bridge seismic isolation has little importance.Field type has a great influence on the seismic responses of the cable-stayed bridge;Traveling wave effect will increase the burden of energy consumption of the bearing and it will also increase the deformation and internal force of the bearing; The impact of traveling wave effect to the seismic response of the bridge structure has the characteristic of shock so it still need to judge whether advantageous according to the actual seismic wave velocity.