Method and device for quickly identifying state of main cables of suspension bridge

An identification method and state identification technology, applied in special data processing applications, tension measurement, instruments, etc., can solve problems such as low accuracy, complicated calculation of identification methods, and identification of main cable status identification methods of suspension bridges. Widely used and applicable effects

Inactive Publication Date: 2010-09-22
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems that the existing identification method of the main cable state of the suspension bridge cannot be identified during

Method used

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  • Method and device for quickly identifying state of main cables of suspension bridge
  • Method and device for quickly identifying state of main cables of suspension bridge
  • Method and device for quickly identifying state of main cables of suspension bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for quickly identifying the state of a main cable of a suspension bridge, comprising the following steps:

[0042] First, after starting the monitoring computer, start monitoring the alignment of the main cable and the bridge deck, and determine the displacement v of the upper and lower ends of each sling i , Simultaneously measure the tension N of each sling i , according to the formula (1) to calculate the vertical restraint stiffness k of a single sling to the main cable i , according to the formula (2) to calculate the vertical restraint stiffness k of the sling to the main cable per unit length

[0043] k i = N i | v i - v i ′ | - - - ( 1 ) ...

Embodiment 2

[0055] Such as image 3 , 4 shown.

[0056] A device for quickly identifying the state of a main cable of a suspension bridge, which is mainly composed of a data acquisition unit 1 and a data analysis unit 2, the data acquisition unit 1 is connected to the data analysis unit 2 through a wireless WLAN network or a USB device 5, and the data acquisition unit 1 It is mainly composed of a three-way acceleration sensor 2, a multi-channel anti-aliasing filter amplifier 3, an A / D conversion module 4, and a wireless WLAN network or a USB device 5. The data analysis unit 2 is mainly composed of a data receiving module 6, a power spectrum and a correlation The analysis module 7, the cable force calculation module 8 and the result display and storage module 9 are composed, the output of the three-way acceleration sensor 2 is connected to the input terminal of the multi-channel anti-aliasing filter amplifier 3, and the output terminal of the multi-channel anti-aliasing filter amplifier 3...

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PUM

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Abstract

The invention relates to a method and a device for quickly identifying the state of main cables of a suspension bridge, and is characterized by comprising the calculation of vertical rigidity k. The method comprises the following steps of: symmetrically installing two three-dimensional acceleration sensors for acquiring signals on each main cable to be detected; sending the signals acquired by the sensors into a data acquisition unit for processing, and sending the processed signals to a data analysis unit through a wired mode or a wireless mode to calculate the natural frequencies of vibration omega 1, omega 2 and omega 3 in the former three orders of the main cable; finally calculating the values of the tension S, the bending stiffness E1 and the linear density m of the main cable through three simultaneous formulas; and repeatedly measuring and calculating to draw a variation curve among the tension S, the bending stiffness E1 and the linear density m of the main cable for a bridge maintenance department to identify the state of the main cables. The invention has simple method and high accuracy, and the detection can be carried out in the overall process of the operation of the suspension bridge.

Description

technical field [0001] The invention relates to a bridge safety monitoring method and device, in particular to a method and device capable of quickly identifying the stressed state of the main cable on a suspension bridge, specifically a rapid identification of the state of the main cable of a suspension bridge method. Background technique [0002] As we all know, cables are the main load-bearing components of suspension bridges. Main cables are critical to the structural safety of suspension bridges and are difficult to replace. In the past, because the safety factor of the main cable is generally very large, it is often considered that the main cable will not be damaged by force. In fact, the closer to the main tower, the greater the tension of the cable, and the easier it is to be damaged, and the cable section at the heel of the boot is the most vulnerable to rainwater erosion, and is also prone to corrosion, which in turn affects its performance. The working state of...

Claims

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Application Information

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IPC IPC(8): G01L5/04G06F17/50
Inventor 王俊刘伟庆徐秀丽罗韧段欣钟建驰吉林冯兆祥陈策阮静
Owner NANJING UNIV OF TECH
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