Finite element analysis and application of the concrete under anchor

This paper takes the 0# block of a prestressed concrete continuous box girder bridge as the research object and establishes a quarter solid model using the large general finite element analysis software Abaqus. Both the shape of anchorage device and the prestressed duct are taken into account in this model to analyze the stress distribution of different parts under a prestressed tension of 1395 MPa. Then the influence range of prestressed tension at the anchorage zone is determined to put forward some guiding opinions for the layout of strain gauges in the construction monitoring stage. The results show that the maximum compressive stress of concrete under anchor is located in the upper part of the anchor cup, and the maximum tensile stress is located around the second anchor plate, which exceeds the design strength. So it is necessary to be strengthened locally. At the same time, the influence range of tensile end stress is large, and the strain gauge should be arranged outside the depth of 0.3 m from the section of the anchorage end during construction monitoring. The horizontal influence range of roof is 3.5m-5.2m, and the vertical influence height of web is 2.8m-4.5m.