Optimizing method of arch bridge suspender pull force for deviation correction in construction process

Abstract

The invention discloses a method for optimizing the pulling force of an arch bridge suspender rod for deviation correction in the construction process. A finite element model is established, and the material properties, geometric properties, boundary conditions and external load information in the finite element model should be consistent with the corresponding data in the design drawings ; Substituting a set of initial tensile forces of suspenders into the built finite element model for formal analysis in the construction stage, and obtaining each initial value vector; establishing an optimization model, and substituting each parameter into the optimized model to obtain the final tensile force. Through the timely correction of the measured weight during the construction process, the present invention realizes that the suspender is only stretched once, and no adjustment is required after the bridge is completed, and at the same time ensures that the tension of the suspender varies evenly and is small during the hoisting process; compared with the traditional calculation of tension method, this method does not require repeated iterations, avoids cumbersome calculations, and can obtain the pulling force results at one time. The invention is applicable to arch bridges with different construction sequences and spans, and has a very wide application range.

Description

technical field [0001] The invention relates to the technical field of transportation bridge and culvert engineering, in particular to a method for optimizing the pull force of an arch bridge suspender for deviation correction in the construction process. Background technique [0002] The quantity and quality of my country's arch bridges rank first in the world. The application of advanced technical methods such as cable-stayed buckle-hanging suspension technology, vacuum-assisted infusion technology, and tower active control proposed by academician Zheng Jielian in bridge construction has made a qualitative leap in arch bridges. Following the successful completion of the Chongqing Wushan Yangtze River Bridge with a calculated span of 460m and the Sichuan Hejiang Yangtze River Bridge with a calculated span of 530m, the Pingnan Third Bridge with a span of 575m under construction has set a new world record. Every increase in the span of a super-long-span arch bridge will put ...

AI Technical Summary

Problems solved by technology

However, the calculation of the formal iterative method is cumbersome, and it is restricted by the convergence conditions, and some of them do not converge.

The inversion analysis method cannot take into account the effects of geometric nonlinearity, shrinkage and creep, and constraint condition changes, which cause the internal force of the structure to be closed; the traditional industry is more recognized that the minimum bending energy method is optimized in the bridge segment, but it does not consider the construction. The process is only used for constant load tension optimization. The implication is that the boom tension needs to be adjusted after the bridge is completed.

The matrix method is also widely used in the optimization of the bridge state, but the accuracy of the matrix solution is poor, and the tension of the short boom is relatively uneven

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