Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Damage degree identification method of high-rise framework structures based on natural frequency change rate

A technology of frequency change rate and damage degree, which is applied in the field of identification of structural damage degree to achieve the effect of quantifying the degree of damage

Active Publication Date: 2016-12-14
DALIAN UNIV
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no relevant report on how the natural frequency change rate can identify the damage degree of the structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Damage degree identification method of high-rise framework structures based on natural frequency change rate
  • Damage degree identification method of high-rise framework structures based on natural frequency change rate
  • Damage degree identification method of high-rise framework structures based on natural frequency change rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The following describes how to use the first-order natural frequency change rate to identify the damage degree of high-rise frame structures in conjunction with the accompanying drawings.

[0043] When the structure is damaged, the stiffness of the structure will decrease accordingly. According to the definition of frequency:

[0044] f = K m

[0045] In the formula, f is the frequency, K is the structural stiffness, and m is the mass of the structure.

[0046] Differentiate both sides simultaneously to get:

[0047] d f = 1 m · 1 2 K · d K

[0048] Simplified:

[0049] d f · 2 m K ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a damage degree identification method of high-rise framework structures based on natural frequency change rate. The method comprises following steps: establishing a relation between frequency change rate kf and damage degree index PK through a numerical simulation method; performing inverse computation to obtain the damage degree index PK by means of actually measured acceleration response values after damage. According to the present damage identification methods, it is required to perform comparison and analysis on current response value signals of the structure with the response value signals before damage to identify damage degree; while by means of the method provided by the invention, only current response value signals are required for analysis to obtain the damage degree of the structure. The provided method quantifies the relation between damage degree index and frequency change rate so that damage degree index can be quantitatively obtained and the damage degree is quantified. According to the provided method, the structure damage degree and the frequency change rate are formulated so that structure damage degree can be accurately calculated by means of the method.

Description

technical field [0001] The invention relates to a method for identifying the degree of damage of a structure, in particular to a method for identifying the degree of damage of a high-rise frame structure. Background technique [0002] In today's building construction, high-rise frame structures are more and more widely used. However, with the effects of material aging, environmental corrosion, load effects, man-made and natural mutation effects, these effects will inevitably lead to structural damage accumulation and resistance. Therefore, it is imminent to detect, identify and evaluate the damage of high-rise frame structures by scientific means from the perspective of structural durability and safety. [0003] The current identification methods based on the damage degree of high-rise frame structures are all through comparative analysis of the response values ​​before and after damage, so as to judge whether the structure is damaged. [0004] However, in real life, the da...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 裴强郭少霞夏超南薛志成
Owner DALIAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com