Research Of Backstays Anchor System Based On Numerical Simulation

Anchorage device is the key part for the effective transfer of pre-stress. With pre-stressed technique widely used in bridge construction, architecture and hydraulic engineering, etc., great attention is paid .So the safety of anchorage device in bridge design is very important.At present, conventional design keep the principle that bigger dimension is safe. And until now, no theoretical formula can be used to calculate the stress and strain of the anchor ring because of its complexity.Based on the structure and working condition of the anchorage device, geometries of the anchor head and connecting plate, intermediate plate and pre-stress wire were simplified here and linear hardening elastic-plastic model was used. After friction coefficient was set, the anchorage device under stress was analyzed by using FEM software.With regard to the experimental design, this thesis conforms to the test requirements of Chifeng bridge anchorage device with the uppest load level 14000KN,the experimental loads are set 1500KN,2000KN,4000KN,6000KN,8000KN,10000KN,12000KN, 14000KN respectively, and those loads will be added in a step by step manner to the fixed level. The above loads will be maintained in five minutes and the results will be recorded. With the experimental load added to 12000KN five minutes (beyond the uppest experimental load by 80%), these experimental load values will be kept in 30 minutes and recorded every 10 minutes. The results of the simulated exam are similar to that of the experimental design which approves the rightness of the numerical model. Based on the above research, this thesis provides a solid theoretical foundation for the design and material selection of connecting plate and anchor head.