Vibration monitoring and safety early warning method in bridge rotation process

A technology of safety early warning and vibration monitoring, which is applied in measuring devices, testing of machines/structural components, and measurement of ultrasonic/sonic/infrasonic waves, etc. highly reliable effects

Pending Publication Date: 2022-01-28
BEIJING UNIV OF TECH
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of research on the relationship between vibration monitoring variables and overall stability of swivel structures, and subjective judgments are mostly based on experience. It is difficult for vibration monitoring results to quantitatively reflect the overturning risk of the structure, so there are inevitably potential safety hazards. frequency, it will cause resonance and pose a threat to the overall stability

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
  • Vibration monitoring and safety early warning method in bridge rotation process
  • Vibration monitoring and safety early warning method in bridge rotation process
  • Vibration monitoring and safety early warning method in bridge rotation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] refer to figure 1 As shown, the present invention proposes a vibration monitoring and safety early warning method for the bridge rotation process, including the following steps:

[0054] refer to figure 2 As shown, there are three main overturning moments that the bridge bears in the process of horizontal rotation, namely, the structural eccentric moment M e , the bending moment M caused by the asymmetric wind load w , the bending moment M caused by the structural rotation vibration v . The balance in the process of horizontal rotation is provided by the supporting force between the upper turntable feet and the lower turntable slideway, and the balance moment is M r . In order to ensure that no overturning occurs during the rotation, the following conditions must be met:

[0055] m r > M v +M w +M e ………………(1)

[0056] Among them, the balance moment M r The expression is:

[0057] m r =λ·R·r………………(2)

[0058] In the formula, R is the design bearing capaci...

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 vibration monitoring and safety early warning method in the bridge rotation process, which comprises the steps of S1, carrying out stress analysis on a bridge to obtain an overturning bending moment borne by the bridge in the rotation process and a condition required when the bridge does not overturn; S2, simplifying the rotation process of the bridge to obtain the relationship between the bending moment caused by the rotation vibration of the structure and the vertical acceleration of the beam end; and S3, on the basis of the steps S1 to S2, obtaining a beam end vertical vibration acceleration limit value in the bridge rotation process, and performing safety early warning according to the beam end vertical vibration acceleration limit value. According to the invention, overall stability monitoring can be achieved, the relation between the vibration monitoring variable and the overall stability in bridge rotation can be effectively established, the overturning danger degree of the structure can be quantitatively reflected, and meanwhile, through the safety early warning technology, the method can be suitable for vibration monitoring in the rotation process of various continuous beam bridges and cable-stayed bridges.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a vibration monitoring and safety early warning method during the rotation of a bridge. Background technique [0002] With the further upgrading of my country's traffic road network and the gradual increase of over-line projects, the horizontal swivel method has become the first choice for over-line bridge construction due to its characteristics of less interference to existing line traffic and strong site adaptability. However, the bridge is subject to uncertain effects such as gusts and rotation-induced vibrations during the rotation process, which inevitably produces vibration responses. In order to ensure the safety in the process of bridge rotation, it is necessary to monitor the rotation construction of the rotation structure. However, the current mainstream swivel construction monitoring scheme only includes strain monitoring of the control section before and after swivel...

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): G01M99/00G01H17/00G06F17/10
CPCG01M99/00G01H17/00G06F17/10
Inventor 许乐张孟琦梁昆陈盈王永欢张文学
Owner BEIJING 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