Research On Structural Performance And Experimental Of Extradosed Cable-stayed Bridge

This thesis firstly summarizes and reviews domestic and overseas development,structural eharaeteristics and the lastest development trends of extrodosed cable-stayed bridge. Secondly, introducts and analyzes the calculation methods and characteristics of the cable-stayed bridge, the main analysis are the internal force calculation of the constant load and live load,the determination of the reasonable cable force under the finished stage and the initialtensile force of the cables in the construction stage, and describes two limit states and its calculation principle. Based on the design scheme of extrodosed cable-stayed bridge Yudaohe Bridge in Huairou, Beijing, a combined finite element model based on beam element for the bridge is established by MIDAS-a large-scale finite element software.The structural behaviors and deflections under 46 construction stages are computed and analyzed indetail. Calculation and analysis to the stress of the beam, Calculation and analysis to the stress of the beam and cable under the bearing capacity limit state and normal use limit state in the using stage; Then maked the live load test for the finished stage, described the purpose, content and basis of the load test; Introduces indetail the plan and implementation method of the static load and dynamic load test;. The paper finally to generalize summary and outlook, some last ideas of the bridge performance under the loads are drawn, finally puts forward some problems which are needs to be further researched. Therefore,the static and dynamic performance and analysing methods ofextrodosed cable-stayed bridge are comprehensively understood.and it provides certain reference value for a similar study.