Analysis Of Static And Dynamic Performance Of The Hangzhou Jiusha Bridge

With the increasing standards of people’s aesthetic requirements, designers propose various beautiful arch bridges of dissimilated and unique structures in bridge design. Meanwhile, dissimilated structures demand higher capabilities of design and calculation analysis. The past mechanical calculation model seldom or even never considers the effects that the substructure work on the internal force, power and stability of the main structure. The effects may be beneficial for the structure, saving the project cost, but may do harm to the local structure with security risks. Therefore, based on the relied project, the novel and peculiar three span continuous dissimilated arch bridge without stress, the thesis studies its static and dynamic performance and establishes the upper structure space model and the overall space model which takes the pile-soil interaction of substructure into consideration. It is known that the suspender force of tied arch bridge has a great effect on the structure’s internal force and linear. Therefore, the thesis adopts zero displacement method, rigid hanger method and the minimum bending energy method on the basis of the literature review to calculate bridge suspender force respectively. Then it compares and analyzes the results by the above three methods and puts forward the stressless boom length method of this thesis which is a reasonable bridge suspender force for this relied project. And it combines proposed inverted method and taking-away method to get boom tension force in order to dig out the reasonable tension order by analyzing the influence different tension order can bring to deformation and the internal force of arch and girder. Finally, it analyses how the special device lever acts on the structure and proposes more secure and reliable modeling approach and optimal design through comparing the stress results of key structures such as arch ribs and primary beams.As the urban traffic construction accelerates and car speed increases in the modern era, the bridge vibration performance under a moving load and vehicle traffic safety control draw increasing attention of bridge engineers, so this thesis analyzes vehicle-bridge coupling vibration on this dissimilated arch bridge and the first time to consider the pile-soil interaction overall sapce model. Firstly, to use finite element software ANSYS to establish bridge space models with and without consideration of substructure and compares natural vibration characteristics of the two models.It then adopts numerical analysis method of vehicle-bridge coupling vibration to test the vibration in different time. Furthermore, it works out the impact factor of key structures such as primary beams, arch ribs and booms in dissimilated arch bridges considering the circumstance when cars are moving on the bridge and the bridge surface is uneven. It also compares the changing rules of impact factors of the two models and gets at some locations, the overall model impact factor larger than the upper structure space model28.7%, it can not be ignored.At last compares them with standard calculation results to suggest project design value for reference.This thesis accumulates the design experiences and analysis method of bridge of this type by static and dynamic performance study on the relied project. The results can provide the similar bridge design with project application and reference value.