Computer simulation for stress distribution of prestressed cables

The shear stress distribution of the prestressed cables was analyzed in a nonlinear finite element method, also the dynamic evolution law of shear stress distribution was researched. It was demonstrated by numerical analysis that, with the increase of load, the whole anchorage system generally underwent elastic stage, elastic-plastic slip stage, elastic-plastic slipping-debonding stage and failure stage. When the anchorage length was small, it only underwent elastic stage, elastic-plastic slip stage, and failure stage without elastic-plastic slipping-debonding stage, and in this case, the anchorage system expressed destabilizing failure and sudden damage of anchorage system. Analysis shows that interface´ s mechanical behaviors are properly described by finite element analysis model of anchorage body interface mechanics which is establish base on experimental results, especially the composite interface unit combining solid unit with expansion character and contact unit was established creatively, by which the expansion and slipping characters of interface are properly expressed.