Studies On The Mechanical Behavior Of Cable-stayed Anchorage System

The cable-stayed anchorage system is the important segment that transfers thelocal concentrated force of stay cables to the total cross section of pylon and mainbeam. Because of the powerful local concentrated force, the stress state andcomposition at this area is very complicated. Therefore the pylon anchorage zonesegment is usually the key point of design, the reliability of cable-pylon anchoragezone determines the safety of the whole Cable-Stayed Bridge.One of the methods of studying the anchoring models is carrying out experiments.The paper carries out the simulation before the experiments in order to provide areference for the experiment as well as conduct a study on the distribution of the stress.Ansys is used to analysis the steel anchor beam of tower anchorage and tensile anchorplate on the beam anchorage. The discussion of the anchoring structurereasonableness and the optimization of Local components provide technical supportfor this bridge and scientific basis for popularization and application of the anchoringsystem. The main research work includes five parts:Firstly, research achievements on anchoring models of cable-stayed bridge, homeand abroad, are systematically collected. The features of different anchoring modelsare analysis. It is also counted that the relevant provisions of the domestic andinternational norms on the cable fatigue test and the research on cable fatigue test athome and abroad.Secondly, we studied the mechanical performance and the security of this bridgetower anchorage zone from maximum design cable force, broken cable or replace thecable-stayed. Because of the clear force transmission path between the steel anchorbeams and concrete tower wall, we respectively build steel anchor beams and the wallof the tower model. And the studies show that the force transferring path of steelanchor beam was clear, and total force status was reasonable. But stress concentrationappeared in the connection position between the plate members, the weld strengthshould be guaranteed. Large local tensile stress appeared on concrete tower wall andcorbel, it is necessary to improve the strength and durability of the corbel to transfercable force evenly and effectively to the concrete tower wall.Finally, we studied the mechanical performance and the security of this bridge beam anchorage zone, and optimized the structure, at the same time we discussed therationality of Anchorage zone design. The studies show that the Anchorage Zonesforce performance basically meets the requirements, the force transferring path wasclear. But stress concentration appeared in the connection position between the platemembers, the weld strength should be guaranteed in construction process. The studiesof structural optimization have shown that it was difficult to eliminate the stressconcentration by changing the size of the plates, but it significantly improved localstress, which is of great significance to improve the fatigue resistance of the steelmembers.