Large-span arch bridge arch ring line shape control method and optimization calculation model

Abstract

The invention relates to the field of bridge construction, in particular to a large-span arch bridge arch ring line shape control method and an optimization calculation model. Aiming at an arch bridgewhich is large in arch rib span, large in hoisting weight, large in number of hoisting sections and difficult in linear control, a traditional method is adopted for generating large transverse deviation in the construction process; based on this, a space finite element model is established through finite element software; based on an influence matrix principle, a displacement influence matrix ofthe arch ring is calculated under the action of dead weight, each unit of cable buckling force and each unit of side cable wind cable; then, according to the coupling effect of the buckle cable and the side cable wind cable on displacement and in combination with the optimization calculation theory, the deviation between the buckle cable and the target line shape after closure and cable looseningserves as a constraint function, the deviation between the buckle cable and the target line shape in the construction process serves as a target function, the buckle cable force and the side cable wind cable initial tension are solved, and then the arch ring line shape and cable force in construction are calculated; results show that the vertical deviation and the transverse deviation of the archring of the arch bridge with the span of 360 m can be controlled within 10 mm and 6 mm respectively after the arch ring is closed and the cable is loosened, and high-precision assembly of the arch ring can be achieved.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a method for controlling the arch ring shape of a long-span arch bridge and an optimization calculation model. Background technique [0002] Existing long-span arch bridges mostly adopt the cable-stayed buckle-hanging construction technology. However, with the continuous increase of the span of the arch ring, the continuous increase of hoisting weight and the number of hoisting segments, the linear control of the arch ring is also facing new challenges. challenge. [0003] At present, the alignment control methods of arch bridges include zero bending moment method, positive installation method, improved iteration method and optimization method, etc. The zero-moment method assumes that the segments of the arch ribs are connected by hinges, and calculates the force of each buckle cable according to the principle of moment balance; this method is simple and efficient in calculati...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for controlling the alignment of the arch ring of a large-span arch bridge in view of the prior art that cannot solve the linear control problem of the lateral displacement of the arch ring. Under the premise of considering the vertical and lateral deviations, strictly control the actual alignment and target alignment and cable force of the structure at each construction and hoisting stage to ensure assembly accuracy

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