Abstract：Based on the technical guide of highway bridge construction monitoring, the deformation laws of arch ribs of steel bridges were investigated through monitoring the displacement and the internal stress of arch rib at each construction stage in real time. The results show that the variation interval of vertical displacement of steel bridge arch rib at L／4 and 3L／4 is from 0.30 to 13.50 mm under different working conditions, and the vertical displacement range of L／2 is from 0.25 to 11.40 mm under different working conditions. The direction of displacement is vertical downward. The stress range of the arch legs at both ends of the steel arch ribs varies from 6.79 to 26.53 MPa under various working conditions, and the variation range of stress at L／4 and 3L／4 is from 1.60 to 27.93 MPa under various working conditions. The stress variation range at L／2 is from 0.21 to 11.49 MPa under various working conditions, and the stress change is compressive stress. The stress deformation change trend of the symmetrical position for the full span arch rib is consistent, and the whole arch rib produces the maximum displacement change and the internal stress change after the suspender is tensioned under the working condition 2.The construction phase can be used as the key monitoring condition of forced deformation.
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2019, Vol. 40 
