| Extradosed cable-stayed bridges are hybrid structures , whose mechanic characteristic lies between continuous beam bridges and cable-stayed bridges. In recent years, extradosed cable-stayed bridges have rapidly developed in the foreign and domestic because of its economy and beauty.However, cable-girder anchorage is a key part for cable-stayed bridges, where the local concentrated force of cable will be transferred to the girder safely and uniformly. It is very important to know the stress distribution of anchorage zones under cable forces. So, cable-girder anchorage is the difficult and important part in designing and constructing of Extradosed cable-stayed bridge. The simple analysis of mechanics is difficult to reflect actual working behavior and stress distribution of structure, no more than closeing combination with the structural model test can bring scientific research.This paper regard the Chong Qing Jia Yue bridge as an example, With the engineering as the background, by reduced scale model test and the computer simulation analysis, find out the complex state of stress, to examine the stress performance of the anchorage of girder, bring forward the improvement suggestions and advice for any problems. First, we carried on the spatial stress finite element analysis using the ANSYS software in view of the rope tower anchor area 4T7 stage; Then, we carried on the test of reduced-scale model to anchorage zone of girder, compared it with simulation analysis test, validated the correctness and applicability of test model; nalysis its stress size and distribution through the prestressed loss and the thickness of transversal beam by create entity finite model; According to the space stress analysis and the test result of reduced-scale model, in the aspects of the transversal beam prestress, the vacuum assistance pumping technique and concrete construction quality controlling, the guidance proposal and the request were put forward to to the project entity construction control.
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