Tests And Research About Fatigue Property Of The Cable-Girder Connection For Cable Stayed Bridge

The tensile anchor plate structure in cable-beam anchorage zones has been more frequently applied to modern cable-stayed bridges, relying on its remarkable advantages, such as explicit force transmission route, convenience in construction. However in this type of anchorage structure, those key weld seams are bearing complex loads, whose fatigue performance has a direct relationship with bridges’safety. Since they are relatively time consuming and costly, most of the current fatigue tests are limited for small components. As for large welded structures like the cable-beam anchorage zones in cable-stayed bridges, their weld seams are different from those of small components, in the aspects of welding quality and loading conditions. This limits the applications of existing research achievements in this kind of structure. Therefore, full-scale fatigue test is required to verify the fatigue properties of cable-beam anchorage zones.Meanwhile, the study of fatigue load spectrum for highway bridges in China is not complete. Neither fatigue load spectrum nor standard fatigue vehicle model has been presented in the highway bridge design codes of China. Combined with existing research achievements and based on the forecasting traffic volume, this thesis will summarize a set of practical methods to get the fatigue load spectrum and write relevant programs.FEM software of Midas Civil and ANSYS will be used respectively to analyze the fatigue properties of Second Fengdu Yangtze river bridge’s cable-beam anchorage zones. And according to the results, a fatigue test of cable-beam anchorage zones will be carried out. With reference to relevant codes and existing research results, the evaluation of their fatigue properties can be done. Finally, the method of designing this kind of cable-beam anchorage zones will be discussed.