Feedback control method for tension overall process of prestress grid structure

Abstract

The invention discloses a feedback control method for a tension overall process of a prestress grid structure. The feedback control method comprises key steps of firstly, performing analysis and preparation; secondly, determining a layout state baseline finite element model of the prestress grid structure; thirdly, subjecting construction errors of structure layout states to probability finite-element analysis; fourthly, constructing a reverse neural network feedback system of a predicted pretension control value; fifthly, performing feedback control of the tension overall process. By means of the feedback control method based on construction monitoring data, on the basis of the construction error probability finite-element analysis which is performed on an initiating structure analytical module, a reverse neural network technology is used for constructing a relation module of a structural response and the pretension control value, a pretension control scheme is subjected to dynamic adjustment on the basis of actual measurement structural response data in the process of an actual multi-stage tension overall process, and random disturbance of the construction errors can be gradually eliminated, so that prospective design states of the structure are achieved after the tension of the structure is finished.

Description

technical field [0001] The invention belongs to the field of numerical simulation analysis of construction control of a prestressed grid structure, and relates to a method for dynamically adjusting the stretching scheme of a prestressed grid structure by a feedback control system based on construction monitoring data. Background technique [0002] Prestressed grid structure is a new type of hybrid large-span space steel structure system formed by applying modern prestressing technology to traditional space grid structure, including prestressed grid (shell), suspension dome, arch support grid Shell and other typical structural types. Due to the advantages of good mechanical performance, strong spanning ability, diverse spatial shapes, and low resource consumption, this type of structure has developed rapidly in the world in the past two decades, and has been widely used in stadiums, convention centers, and airport stations. Important public buildings such as hangars, industr...

AI Technical Summary

Problems solved by technology

However, the random interference of construction errors (such as node geometry errors, initial defects of cables, and support installation deviations, etc.) inevitably exists during the prestressing implementation process, resulting in differences between the actual state of the structure and the theoretical analysis model

Due to the unidirectional characteristics of the open-loop control, it does not have the real-time feedback-adjustment function of the error. Once the difference accumulates to a certain extent, the actual prestressed state of the structure may It deviates far from the target prestressed state, and even endangers the safety performance of the structure in the construction stage, leaving a large safety hazard for the normal operation of the structure in the subsequent use stage.

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