Cable Force Analysis for Bridge Completion and Construction of Railway Long-Span Continuous Beam and Arch Bridge
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Xiaozhong Li, Simeng Liu
The continuous beam-arch composite bridge is a typical ternary structure. Due to its internal high-order static indeterminacy, the three parts of the structure are restricted during the construction stage and the later stage of the bridge, and the tensile force of the suspender has a great impact on the final stress state of itself and the overall structure. This article relies on engineering examples, using the Midas Civil finite element software and the minimum bending strain energy method to calculate the bridge cable force, and analyzes the static characteristics of the structure under this cable force. The difference method is used to calculate the construction cable force; changes of cable force as well as the stress and deformation of the beam and arch structure during the tension process are analyzed. The results show that, the cable force obtained by the minimum bending energy method is relatively uniform. Under this cable force, the arch rib steel tube is under uniform compression, and the stress of the main beam is deformed and meets the requirements of the code. Based on the minimum bending energy method, the cable forces of bridge are calculated for the proposed tensioning sequence. After the second phase of paving, the cable force reached the bridge cable force, and the accuracy met the requirements. The influence of the boom force on the static characteristics of the beam and arch during the tensioning process was analyzed.
Continuous beam-arch composite bridge, Cable force of completed bridge, Construction cable force, Finite element analysis