The Local Analysis In Cable And Girder Anchorage Structure Of Cable-Stayed Bridge

In recent years, the structure of cable-stayed bridge has been developing very rapidly, with the span of many cable-stayed bridges at home and abroad belonging to long-span bridge. The cable and girder anchorage structure of cable-stayed bridge is stress concentration and complex structure, and it is important structure between cable and girder. The stress state of cable and girder anchorage structure is important index to measure the working performance of the bridge structure. Therefore, in the study of cable-stayed bridge, the cable and girder anchorage structure is often served as an important component of the cable-stayed bridge and the researchers concerned.At present, the domestic and overseas researchers often use segment model experiment studying on the cable and girder anchorage structure. The researchers are generally only considering the cable-force on the structure, the end socket of segmental model assumed to be fixed or free. The stress of segment model and the real bridge structure differences, the researchers need to make sure that the result of the experiment can or not apply to the real bridge. At the same time, considering the economic problem, the total bridge model test is not feasible. In addition, the structure form and the local stress of different cable and girder anchorage structure is difference, less likely to do a lot of the whole bridge model test. Therefore, accurately determine the boundary conditions of segmental model particularly important, is the key to the static and fatigue test research of the segmental model.The bridge of Sichuan province is a hybrid girder cable-stayed bridge with a single pylon and one cable plane, the cable and girder anchorage structure of steel box girder making of steel anchor box and the cable and girder anchorage structure of concrete beam using anchor block. This text use fine calculation of the cable and girder anchorage structure, addressed as Hybrid element model method, studying on the stress of the two structures. The whole bridge mixed cell model established by universal finite element software Midas Civil, the cable and girder anchorage structure and near the beam structure using plate or entity unit, other parts of the whole bridge with beam element,to calculate the structure stress distribution. By mixing unit model calculation, this text list two beam structures stress distribution under different load, analyzing of stress concentration and force transmission mechanism. In the end, combining with the relevant specification and the existing research results, this text evaluate the structural behavior of the cable and girder anchorage structure and discuss the reasonable design method of the cable and girder anchorage structure, Using to guide the structure design.