Abstract
Effective stress of prestressed steel bars in bridge structures is very important, and there is no compulsory requirement to test the tensile force of prestressed steel bars in bridge codes of our country. However, the lack of tensile force and failure of prestressed reinforcement will bring significant security risks. In this paper, according to the structural characteristics and anchorage characteristics of prestressed steel bar, on the basis of theoretical analysis and experiment, the curve of tension F and elongation S of single prestressed steel strand is established, which lays a foundation for effective stress detection of bridge steel bar in China.
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