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A method for monitoring the prestress value and prestress loss of concrete beams

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

Inactive Publication Date: 2016-06-08
SHANGHAI INST OF TECH
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  • Abstract
  • Description
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  • Application Information

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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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  • A method for monitoring the prestress value and prestress loss of concrete beams
  • A method for monitoring the prestress value and prestress loss of concrete beams
  • A method for monitoring the prestress value and prestress loss of concrete beams

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Embodiment Construction

[0021] A method for monitoring the prestress value and prestress loss of a prestressed concrete beam based on the piezoelectric impedance method. The resonant frequency and the root mean square deviation are extracted from the piezoelectric admittance signal of the piezoelectric ceramic pasted on the prestressed concrete beam. For the prestress value of the stressed concrete beam, the resonant frequency deviation index and the root mean square deviation deviation index are extracted to identify the prestress loss of the prestressed concrete beam. Further, it includes the following steps:

[0022] 1) Perform piezoelectric impedance test on the prestressed concrete beam and obtain the prestress value and the piezoelectric admittance signal of the piezoelectric ceramic;

[0023] 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 freq...

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Abstract

The invention relates to a method for monitoring the prestress value and prestress loss of a concrete beam, which extracts the resonance frequency and the root mean square deviation from the piezoelectric admittance signal of the piezoelectric ceramic pasted on the prestress concrete beam to identify the prestress value of the prestress concrete beam. Stress values, resonant frequency shift index and root mean square deviation shift index are extracted to identify the prestress loss of prestressed concrete beams. It provides a new way for the real-time monitoring of the prestress value and prestress loss of prestressed concrete beams. Compared with the prior art, the present invention can realize rapid monitoring, and can quickly obtain the prestressed value and prestressed loss of the prestressed concrete beam without a sensor for measuring the prestressed value, thereby accurately evaluating the prestressed concrete beam under the normal service state. carrying capacity.

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 a concrete beam. Background technique [0002] For prestressed concrete beam bridges, the bearing capacity under normal use conditions is determined by the prestress value. Therefore, how to determine the effective prestress is an important content in the structural design and use of prestressed concrete beam bridges. If sensors have been arranged on the prestressed tendons during the construction of the bridge to measure the prestress value or the strain value of the prestressed tendons, the existing prestress value can be directly measured through the sensor signal. If the corresponding sensor is not arranged or the sensor is damaged, the pre-stress cannot be obtained directly. Abraham (AbrahamMA,ParkS,StubbsN.Lossofprestresspredictionbasedonnondestructivedamagelocationalgorithms[C].SanDiego,CA,USA:SocietyofPhoto...

Claims

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Application Information

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