Static And Dynamic Characteristics With Seismic Response Analysis Of Guizhou Wujiang Large-Span Bridge

In this paper, the study is based on Guizhou Wujiang lonely-span suspension Bridge, the girder of which is composed by PC-Slab. The Towers of the bridge is of different heights, but the top elevation of them are the same. To ensure the safety of the construction stages and the operational stage of the bridge, analyzing the static and dynamic characteristics of the bridge are of great importance, the main work are as follows:(1) Firstly, the article summarized the traits and the mechanical features of the bridge, also summarized the status of the dynamic characteristics studies of the suspension bridge. A brief description on both the necessity and concrete work on the issues are raised within.(2) The thesis presented the linear calculations of a suspension bridge concisely, and elaborated the non-linear factors and estimation of the vibration frequencies. It depicted the methods and contents of analyzing the dynamic characteristics of bridge structures, and pointed out the dynamic characteristics of suspension bridges; further more, it recounted Finite-Element-Method(FEM), with which used to compute the dynamic and static circumstances of Wujiang River Bridge. The process provided a theoretical basis for the static and dynamic study of Wujiang River Bridge.(3)The chapter employed the FEM software linked the principles of the formation of a PC-slab suspension bridge model with the fabrication process, to set up the Wujiang space finite element model, and resolved the forces and deformations of some crucial points within its’lifespan, which were incited by the construction process. In addition, it maped out the pushing steps of the saddles on the crown of towers, and computed the travelling of the cable in the saddle slot, with which verified the safety of the bridge.(4) The chapter computed the self-vibration traits of the Wujiang suspension bridge,come to its natural vibration results. While analyzing the self-vibration traits of the bridge under construction, it also calculated the impact of different erection programs to the bridge. Besides it simulated the pile-soil effect and the stiffness of the constraint of the girder to it. While exploring these factors influenced the dynamic properties of the bridge, it focus on the impact of the height of the tower, which can be the contributions to the dynamic characteristics’ changing. Recommendations are given on how to choose the heights of the tower, in order to achieve a reasonable configuration of the bridge to get good dynamic characteristics.(5) In this section, it comparatively utilized both the response-spectrum and time-history mediums to analyze seismic response of the finished bridge, contract the difference between the results. To identify the influence of one or multidirectional seismic spectrums’to the bridge, it employed the time-history medium to acquire the results of uniform seismic spectrum imputed from different directions into the bridge, verified the reliability of the analyzing results, and ensured the reliability of the bridge.