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Optical measurement method and rapid test system for bridge man-induced impact load

A technology of impact load and optical measurement, applied in the direction of impact test, vibration test, measuring device, etc., can solve the problems affecting the rapid test of bridges, etc., and achieve the effect of structural performance evaluation, strong anti-noise ability and simple operation

Active Publication Date: 2019-11-12
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to install acceleration sensors in various parts of the human body, which affects the requirements of rapid bridge testing to a certain extent.

Method used

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  • Optical measurement method and rapid test system for bridge man-induced impact load
  • Optical measurement method and rapid test system for bridge man-induced impact load
  • Optical measurement method and rapid test system for bridge man-induced impact load

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Embodiment 1

[0052] combine Figure 3 ~ Figure 7 , the man-induced impact load optical measurement method and bridge quick test system of the present invention are illustrated through a typical bridge case, and its specific steps are as follows:

[0053] 1) Image acquisition.

[0054] A high-speed camera (FASTCAM SA3) is used to shoot the moving image sequence when the human body jumps up and down. The resolution of the camera is 512*1024 pixels, and the frequency is 1024Hz. In order to verify the applicability of the method of the present invention, three test conditions are considered in this test , that is, three working conditions were considered in this test: (a) multiple jumps with toes and heels on the ground, (b) multiple jumps with toes and heels on the ground, and (c) multiple jumps with toes and heels on the ground at the same time.

[0055] 2) Calculation of the vertical velocity time history when the pedestrian jumps.

[0056] Select the area of ​​interest according to the a...

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Abstract

The invention discloses an optical measurement method and quick testing system of a human-caused impact load of a bridge. The method comprises: collecting an image; calculating vertical speed information in leaping of a pedestrian; calculating acceleration information of a pedestrian in vertical leaping; estimating a human-caused dynamic impact load; identifying structural parameters; and evaluating performances. According to the invention, the human-caused impact load testing method with non-contact measurement based on a high-speed camera is different from the traditional impact vibration testing based on an artificial excitation device. According to the testing method, the pedestrian load on a pedestrian overpass is used as an excitation source directly to realize impact vibration testing of the urban pedestrian bridge conveniently and quickly; and on the basis of the measured human-caused dynamic impact load, the deep structural parameter identification can be realized and the structural performance evaluation can be realized effectively and effectively.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and in particular relates to an optical measurement method of bridge human-induced impact load and a rapid test system thereof, which can realize rapid measurement of bridge input impact load and safety state evaluation. Background technique [0002] The infrastructure of countries around the world is huge and plays an important role in national economic life. On the other hand, during the long service period of infrastructure, due to environmental erosion, daily service loads and even overloading, the performance of the structure will gradually degrade and may be attacked by extreme natural disasters such as earthquakes and typhoons at any time. The performance evaluation of many bridges to ensure structural safety and optimize maintenance and management costs is a common issue that needs to be solved urgently at home and abroad. Shock vibration testing is an important meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/08G01M7/02
CPCG01M7/00G01M7/08
Inventor 张建田永丁于姗姗
Owner SOUTHEAST UNIV
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