Abstract:Previous fatigue tests on the anchorage zones

the orthotropic steel decks and the suspenders of suspension bridges are only the experiments of single component. But the stresses of these components are very complex and in a complicated spatial stress states

and the boundary conditions on the model have the great impact on fatigue test results. To evaluating the fatigue performance on the key structural details of Qingcaobei Yangtze River bridge

and verifying the rationality of the design

safety and durability of the bridge

a 1:4 scaled integration model fatigue test including main cables

anchorage zones

hangers and box girders is carried out. Experiment results show that

the stresses redistribution in the integrated model after fatigue loading is not obvious; the principal stresses of static loads test during the fatigue experiment are small different; the relationship between displacement and load is approximately linear. Displacement and each static load test values in the process of loading and unloading has good symmetry and recoverability

which shows that the whole structure is in the elastic stage. Fatigue cracks are not found in the key structure details the structure under the design of fatigue loading

so the structural fatigue performance meet the design requirements. Through the study of the fatigue experiment of integrated model structure

the fatigue performance of the integrated model can reflect the actual fatigue performance of the cable-anchorage -hanger-girder structure

and the integrated fatigue experiment can provide some certain reference significance.