Arch bridge suspender tension optimization method for rectifying deviation in construction process

Abstract

The invention discloses an arch bridge suspender tension optimization method for construction process deviation rectification, and the method comprises the steps: building a finite element model, andenabling the material characteristics, geometric characteristics and boundary conditions in the finite element model to be consistent with the external load information and the corresponding data of adesign drawing; substituting the determined group of suspender initial tension into a built finite element model to carry out normal installation analysis in a construction stage to obtain each initial value vector; and establishing an optimization model, and substituting each parameter into the optimization model to obtain a final tensioning force. The actually measured weight is corrected in time in the construction process, so that the suspender is tensioned only once and is not adjusted any more after a bridge is formed, and meanwhile it is ensured that the tension of the suspender is changed uniformly and slightly in the hoisting process; compared with a traditional tension calculation method, the method has the advantages that repeated iteration is not needed, tedious calculation isavoided, and a tension result can be obtained at a time. The method is suitable for arch bridges with different construction sequences and spans, and the application range is very wide.

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 ...

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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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