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Steel anchor beam of pylon anchorage zone is the key part of cable-stayed bridge. There is much complex stress in it, and special research about it is little at home and abroad. Stress analysis of cable-stayed bridge steel anchor beam can guarantee the rationality of the design and construction.Based on the Wujiang 3rd Bridge of Sinan, this paper makes a study on stress of Steel anchor beam of pylon anchorage zone Wujiang 3rd Bridge, which is with single tower double cable planes and PC double main beam structure. This bridge adopts tower beam consolidation system, two-way prestressed concrete structure, and steel beam structure in anchored anchorage zone.This paper elaborate the mechanical characteristics of anchorage zone of concrete cable-stayed bridge, and makes the overall static analysis for Wujiang 3rd Bridge, obtains the least agile force. Based on the results of static analysis, analyzes the local stress of steel anchor beam with ANSYS software, and obtains the stress distribution of the various component parts of the steel anchor beam, and discusses the reasonable of steel anchor beam design.Through this paper, the maximum deformation of the steel anchor beam is small, which is within the specification limits. The pressure as the main stress of the steel anchor beams, the maximum stress is 230MPa, the overall stress level of steel anchor beam is generally low, are within the allowable stress 276MPa, and the design of the steel beam is relatively reasonable. And there is some stress concentration zone on the contact surface of the components, the stress concentration level is generally not high, some reinforcement and optimization measures are proposed in this paper.The conclusions can be applied to the same type of steel anchor beam design, construction, monitoring.
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