Large-span arch bridge temporary inhaul cable force calculation method based on influence matrix method

Abstract

The invention discloses a large-span arch bridge temporary inhaul cable force calculation method based on an influence matrix method, and relates to an arch bridge cable force calculation method. The method comprises steps of determining control conditions of structural states, and determining the number and positions of concerned sections in the arch rib and allowable values of internal force or stress of the concerned sections; extracting four types of influence matrixes through finite element software; calculating cable force change in a specific state, considering four conditions according to control conditions in each construction stage, performing trial calculation on the cable force change, and selecting the specific state; calculating a structural state to obtain an internal force or stress result of the concerned section; judging the structure state, comparing the trial value with the allowable value, if the requirement is met, calculating the next construction stage, and if the requirement is not met, adjusting the structure state until the requirement is met. By considering the influence of each variable load and each fixed load on the inhaul cable, the corresponding influence matrix is obtained, the factors are comprehensively considered, and the cable force of the inhaul cable can be quickly and accurately calculated.

Description

technical field [0001] The invention relates to a method for calculating the cable force of an arch bridge, in particular to a method for calculating the temporary cable force of a large-span arch bridge based on an influence matrix method, and belongs to the technical field of arch bridge construction monitoring. Background technique [0002] Arch bridges have been widely used on highways in my country due to their advantages such as large spanning capacity, full use of materials, and good durability. For arch bridges, the line shape of arch ribs determines its stress state and aesthetics. Therefore, how to precisely control the line formation of arch ribs is an important part of the construction process of arch bridges. [0003] According to the construction technical characteristics of arch bridges, the construction methods of arch bridges can be divided into three types, including support construction method, cable-stayed buckle-hanging cantilever cast-in-place method an...

AI Technical Summary

Problems solved by technology

The cable adjustment process of the front-mounting method is highly subjective and empirical, and is not suitable for long-span arch bridges with a large number of arch rib segments; When the cable force is inversely solved, the exact solution cannot be obtained. In addition, this method cannot consider the structural state changes caused by the time-varying characteristics of concrete shrinkage and creep. However, it mainly optimizes the line shape when closing and loosening the cables by constraining the arch rib stress, line deviation and cable force during the construction process, but the problems of cable force uniformity and line assembly accuracy during the construction process cannot be solved.

Therefore, in view of the complicated and low-accuracy calculation process of the cable force in the temporary cable construction of long-span arch bridges, there is an urgent need for a simpler and clearer method that can quickly and accurately calculate the cable force

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