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Concrete beam prestress value and prestress loss monitoring method

A concrete beam, prestressed technology, applied in the field of structural monitoring

Inactive Publication Date: 2014-12-10
SHANGHAI INST OF TECH
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Problems solved by technology

[0003] The present invention aims at the problems existing in the existing prestress identification methods, and proposes a monitoring method for the prestress value and prestress loss of concrete beams, which is identified by the piezoelectric admittance signal of the piezoelectric ceramic pasted on the prestress concrete beam Prestress Value and Prestress Loss of Prestressed Concrete Beams

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  • Concrete beam prestress value and prestress loss monitoring method
  • Concrete beam prestress value and prestress loss monitoring method

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Embodiment Construction

[0023] A monitoring method for prestress value and prestress loss of prestressed concrete beams based on piezoelectric impedance method, which extracts resonance frequency and root mean square deviation from piezoelectric admittance signals of piezoelectric ceramics pasted on prestressed concrete beams to identify prestressed concrete beams. Based on the prestress value of the stressed concrete beam, the resonant frequency shift index and the root mean square deviation shift index are extracted to identify the prestress loss of the prestressed concrete beam. Further, it includes the following steps:

[0024] 1) Perform piezoelectric impedance test on prestressed concrete beams and obtain prestress value and piezoelectric admittance signal of piezoelectric ceramics;

[0025] 2) Analyze and process the piezoelectric admittance signal to obtain the resonance frequency and root mean square deviation, analyze and process the piezoelectric admittance signal to obtain the resonance f...

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Abstract

The invention relates to a concrete beam prestress value and prestress loss monitoring method. The method includes extracting resonant frequency and root-mean-square deviation from piezoelectric admittance signals of piezoelectric ceramic of the prestress concrete beam to recognize prestress value of a prestress concrete beam and extracting resonant frequency deviation indexes and root-mean-square deviation indexes to recognize prestress loss of the prestress concrete beam. The method provides a new way for real-time monitoring of the prestress value and the prestress loss of the prestress concrete. Compared with the prior art, the method can achieve quick monitoring, can obtain the prestress value and the prestress loss quickly of the prestress concrete beam not provided with a sensor for measuring the prestress value, and can accurately evaluate the loading force of the prestress concrete beam in the normal use state.

Description

technical field [0001] The invention relates to a structure monitoring technology, in particular to a method for monitoring the prestress value and prestress loss of concrete beams. Background technique [0002] For prestressed concrete girder bridges, the bearing capacity under normal service conditions is determined by the prestress value. Therefore, how to determine the effective prestress is an important content in the design and use of prestressed concrete beam bridge structures. If sensors have been placed on the prestressed tendons to measure the prestressed value or the strain value of the prestressed tendons during the construction of the bridge, the existing prestressed value can be directly measured through the sensor signal. If the corresponding sensor is not arranged, or the sensor is damaged, then the prestress cannot be directly obtained. Abraham (Abraham M A, Park S, Stubbs N. Loss of prestress prediction based on nondestructive damage location algorithms[C...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18
Inventor 郭智刚孙智
Owner SHANGHAI INST OF TECH
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