Abstract
In the tensioning construction of continuous box girder bridge strengthened by a stay cable system, local stress concentration of steel joist and bracket is easy to be caused. This paper studies the stress and deformation of key section of steel joist and bracket by combining with real bridge test. The results show that the maximum stress of steel joist and bracket is less than the allowable stress. When the tensioning force value is 2.66 times of the completion cable force, the bottom plate first reaches the yield strength, and the stress change law of the bracket is not strong. The mid-span deformation of the steel joist in the early period of tensioning is gentle, and the change in the later period is large. When the tensioning force reaches the completion cable force, the value is about 1/400 of the span. In the early tensioning period, the relative displacement between the steel bracket and the girder is large, but the change in the later tensioning period is not large.
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