Accumulated fatigue damage self-diagnosis system for railway steel truss bridge node

A fatigue damage and steel truss technology, applied in the field of cumulative fatigue damage self-diagnosis system of railway steel truss bridge joints, can solve problems such as failure to warn in time, failure to know in advance the weld damage of the overall joint, and achieve the effect of ensuring safety

Inactive Publication Date: 2010-07-07
WUHAN UNIV OF TECH
View PDF7 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering that fatigue damage is a cumulative effect, the overall joint weld has no symptoms during the whole process from the beginning of damage accumulation to the initiation of crack

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
  • Accumulated fatigue damage self-diagnosis system for railway steel truss bridge node
  • Accumulated fatigue damage self-diagnosis system for railway steel truss bridge node
  • Accumulated fatigue damage self-diagnosis system for railway steel truss bridge node

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Novel embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

[0018] Such as figure 1 As shown, the cumulative fatigue damage self-diagnosis system for railway steel truss bridge nodes includes a strain sensor 11, a transmission system (not shown), a bending moment and axial force time-history conversion module 12, a database 13, a dynamic stress analysis module 14, a fatigue Cumulative analysis module 15 and human-computer interaction interface 16.

[0019] Such as figure 2 As shown, the bridge node 2 of the railway steel truss bridge connects a plurality of truss members 1, each truss member 1 has a middle section 3 along the length direction of the truss member, and the strain sensor 11 is located at each truss member The middle section 3 of the member 1 is used to collect the stress response time-history signal of the middle section 3 of the truss member 1 when the trai...

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 an accumulated fatigue damage self-diagnosis system for a railway steel truss bridge node. When a train boards a bridge, a stress response time-history signal of a middle cross section of a truss rod piece which is connected with the tested node when the train goes by is automatically acquired through a strain sensor; a bending moment and shaft force time-history conversion module converts the stress response time-history signal into a bending moment and shaft force time-history signal; a dynamic stress analysis module takes a node welding residual stress field which is determined according to a construction process of a node welding line as an initial stress field, and superposes a node train traveling dynamic stress field which is determined by the bending momentand shaft force time-history signal to obtain the position of a most dangerous point and the strain state of the bridge node welding line; and finally, a fatigue accumulation analysis module determines the fatigue damage accumulation degree of the most dangerous point when the train goes by according to the position of the most dangerous point and the strain state and the strain fatigue critical surface method, and then a man-machine interaction interface informs a user of the fatigue damage accumulation degree. Therefore, the system can automatically inform the user of fatigue information ofthe welding line of the railway steel truss bridge node in time so as to repair the railway steel truss bridge in time and guarantee the safety of the railway steel truss bridge.

Description

technical field [0001] The invention relates to the field of bridge structure engineering, in particular to a self-diagnosis system for cumulative fatigue damage of railway steel truss bridge nodes caused by train running. Background technique [0002] Railway steel truss bridge is a common type of railway bridge. Since the running of railway trains is a periodic long-term action, it will cause the cumulative fatigue damage of the overall nodes of the truss structure, especially the joint welds. Considering that fatigue damage is a cumulative effect, the overall joint weld has no symptoms during the whole process from the beginning of damage accumulation to the initiation of cracks, so the failure of the overall joint weld, that is, the initiation of joint cracks, cannot be known in advance When will it happen, so it is impossible to warn in time and fix it in time. [0003] For this reason, it is necessary to provide a self-diagnosis system for cumulative fatigue damage o...

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
IPC IPC(8): G01N33/00G01B21/12
Inventor 瞿伟廉秦顺全刘嘉潘冬发何钟山孟莎
Owner WUHAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap