Overall Lifting Construction Control Method for Large-Segment Steel Arch Bridges Based on Unstressed State Control Theory

The construction method of first splicing the low brackets and then lifting steel arch bridges has become increasingly popular, and its construction control has become a key issue. According to the unstressed state control theory, both the horizontal displacement and rotation angle at the lifted arch segment ends should be approximately 0 during the lifting process. An analytical solution for the position of the lifting points and the tension force in temporary horizontal rods is proposed. The analytical method is verified through a detailed comparison of the analytical results with the finite element model results and the on-site monitoring results. The results show that, for steel arch bridges whose main arch axis is the n-order parabola, the reasonable range of the parameter k is 0.8~0.9 and the specific value is related to the parameter n. The tension force in temporary horizontal rods can be quickly determined. The results meet the requirements of the unstressed state control theory, and the internal forces at the vault and lifting points can be maintained within a reasonable range. This research could be used to effectively control the deformation and stress distributions in the main arch of Shunjiang Bridge during the overall lifting process. The methods proposed provide effective guidance for using the overall lifting method for steel arch bridges.

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