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Piezoelectric impedance information based damage identification method of laminated rubber vibration-isolated bearer

A technology of laminated rubber and vibration isolation bearings, applied in the direction of material impedance, material analysis by electromagnetic means, instruments, etc., can solve problems such as interference structure identification

Active Publication Date: 2019-05-03
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Sensor damage and bonding layer defects can interfere with structure recognition.

Method used

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  • Piezoelectric impedance information based damage identification method of laminated rubber vibration-isolated bearer
  • Piezoelectric impedance information based damage identification method of laminated rubber vibration-isolated bearer
  • Piezoelectric impedance information based damage identification method of laminated rubber vibration-isolated bearer

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Embodiment Construction

[0114] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0115] Such as figure 1 As shown, a method for identifying damage to laminated rubber seismic isolation bearings based on piezoelectric impedance information in a preferred embodiment of the present invention includes the following steps:

[0116] (1) Construct the origin antiresonance frequency characteristic equations of single-damage and non-damage single-coupled periodic structures;

[01...

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Abstract

The invention discloses a piezoelectric impedance information based damage identification method of a laminated rubber vibration-isolated bearer, and belongs to the field of structure detection of civil engineering. The method comprises that (1) an origin antiresonance frequency characteristic equation of a single damage and damage-free single-coupling period structure is established; (2) the laminated rubber vibration-isolated bearer is simplified into a finite single-coupling period structure, and the dimensionless original antiresonance frequency in the damage-free condition is calculated;(3) the sensitivity of the dimensionless original antiresonance frequency to shearing rigidity change of a basic period unit is calculated, and a sensitivity identification equation set is established; and (4) admittance signals before and after damage are collected, the structure origin antiresonance frequency is extracted, and the sensitivity identification equation set is solved based on the change rate of the origin antiresonance frequency before and after damage, and the damage is identified. It is only required to measure change of the origin antiresonance frequency of a few measurementpoints before and after structural damage rather than accurate model parameters of the original structure to identify multiple damages of a period structure accurately.

Description

technical field [0001] The invention belongs to the field of civil engineering structure detection, and more specifically relates to a method for identifying damage of laminated rubber shock-isolation bearings based on piezoelectric impedance information. Background technique [0002] The seismic isolation device bears a large amount of seismic energy consumption, and its performance continues to deteriorate under the long-term effects of multiple factors such as load and environment. It is the key part that is most likely to be damaged during an earthquake. Among them, the laminated rubber shock-isolating bearing is one of the shock-isolating devices widely used at present. Laminated rubber shock-isolation bearings are usually formed by interlacing a layer of rubber with a layer of reinforced steel plates, bonded and pressed by a special process, and can be regarded as a chain composed of several repeating substructures (or periodic units) connected end to end. Harmonizing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00G01N27/02
Inventor 朱宏平张莹翁顺雷鹰袁涌
Owner HUAZHONG UNIV OF SCI & TECH
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