Closed-loop control method for cable-stayed-bridge-cable stretching-drawing construction based on influence matrix correction

An influence matrix, closed-loop control technology, applied in cable-stayed bridges, bridges, bridge forms, etc., can solve the problems of the incremental effect of the cable force being included in the control, and the lack of targeted solutions.

Active Publication Date: 2018-01-23
HARBIN INST OF TECH
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Problems solved by technology

However, in the published results, how to take the incremental effect of the cable force into the control has not yet proposed a targeted solution

Method used

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  • Closed-loop control method for cable-stayed-bridge-cable stretching-drawing construction based on influence matrix correction
  • Closed-loop control method for cable-stayed-bridge-cable stretching-drawing construction based on influence matrix correction
  • Closed-loop control method for cable-stayed-bridge-cable stretching-drawing construction based on influence matrix correction

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Embodiment Construction

[0043] The closed-loop optimal control method for cable tensioning construction of cable-stayed bridges based on the influence matrix correction implemented in this paper, the process is shown in the figure, including:

[0044] Step 1: Combining with the overall construction process of the cable-stayed bridge, determine the tensioning scheme, including tensioning rounds and tensioning sequence;

[0045] Step 2: Establish a model, do perturbation structure analysis according to the established construction process, and extract the influence matrix and tension sequence vector from the model;

[0046] Step 3: Based on the influence matrix and the tension sequence vector, calculate the cable force increment matrix for each round:

[0047] A (s) ={B (s) (0) u (s) (0),...,B (s) u (s) (m-1)}

[0048] Step 4: The first round of tensioning is performed with the original tensioning force sequence vector as the tensioning command (s=0). After each batch is stretched, measure all t...

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Abstract

The invention discloses a closed-loop control method for cable-stayed-bridge-cable stretching-drawing construction based on influence matrix correction, and belongs to the technical field of bridge construction. The closed-loop control method is characterized in that influence matrixes are corrected according to the error of the cable-force forecasting amount relative to the actually-measured amount in the stretching-drawing construction process, and following stretching-drawing orders are thus corrected. The closed-loop control method mainly includes the steps that (1) a model is establishedand analyzed based on drawings, and cable-force sequence vectors and the influence matrixes in all construction stages are extracted; (2) in all stretching-drawing construction stages, the cable forceis measured, and forecast errors of the cable force are calculated; (3) the influence matrixes are modified based on the forecast errors; (4) the stretching-drawing orders are recalculated based on the system function; (5) the (2), (3) and (4) processes are repeated till stretching-drawing construction is ended. According to the closed-loop control method, field application of an engineer is convenient, field-measurement cable-force information is fed back to structural analysis, and the accuracy and the efficiency of cable-stayed-bridge-cable stretching-drawing construction control are improved.

Description

technical field [0001] The invention relates to a bridge construction method, in particular to a cable tensioning construction control method of a cable-stayed bridge, and belongs to the technical field of bridge construction. Background technique [0002] Tensioning cables is an important construction link in the construction process of cable-stayed bridges. During the tensioning construction process, due to the limitation of the number of tensioning equipment and the control space, usually only batch tensioning can be implemented. Generally, the same row of cables in the direction of the cross bridge is used as a group, and they are stretched synchronously row by row until all the cables are stretched in a predetermined order. This is a typical multi-stage construction process. When each row of cables is stretched, the deformation of the structure under force will cause the cable force of the stretched cables to change (this patent is referred to as cable force increment...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E01D11/04E01D21/00G06F17/16
Inventor 杨大伟吕大刚周文松李传江
Owner HARBIN INST OF TECH
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