Automatic test system for actual stress of a bridge based on DIC technology

Patent metadata

Field	Value
Publication number	US-11802808-B2
Application number	US-202017763218-A
Country	US
Kind code	B2
Filing date	Jun 24, 2020
Priority date	Sep 24, 2019
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

The present disclosure provides an automatic test system for actual stress of a bridge based on DIC technology, where the system includes a camera, a phosphor spraying device, a computer, and a sliding rail; the sliding rail is arranged on both sides of an upper wing of a box-shaped concrete beam; the phosphor spraying device is used to spray phosphor on a web of the box-shaped concrete beam to form speckles of varying light and shade; the camera is slidably connected to the sliding rail through a bracket, and is used to photograph the speckles and transmit a speckle image to the computer; and the computer is used to analyze and process the speckle image taken by the camera and generate a time history diagram of stress.

First claim

What is claimed is:

1. An automatic test system for actual stress of a bridge based on DIC technology, wherein the automatic test system comprises a camera ( 2 ), a phosphor spraying device ( 3 ), a computer ( 4 ), and a sliding rail ( 5 );
the sliding rail ( 5 ) is arranged on both sides of an upper wing ( 11 ) of a box-shaped concrete beam ( 1 );
the phosphor spraying device ( 3 ) is used to spray phosphor on a web ( 12 ) of the box-shaped concrete beam ( 1 ) to form speckles of varying light and shade;
the camera ( 2 ) is slidably connected to the sliding rail ( 5 ) through a bracket ( 6 ), and is used to photograph the speckles and transmit a speckle image which is captured to the computer ( 4 ); and
the computer ( 4 ) is used to analyze and process the speckle image taken by the camera ( 2 ) and generate a time history diagram of stress.

2. The automatic test system for the actual stress of the bridge based on the DIC technology according to claim 1 , wherein the phosphor spraying device ( 3 ) is arranged at an angle between the upper wing ( 11 ) and the web ( 12 ) of the box-shaped concrete beam ( 1 ).

3. The automatic test system for the actual stress of the bridge based on the DIC technology according to claim 2 , wherein the phosphor spraying device ( 3 ) comprises a nozzle ( 31 ), a conduit ( 32 ), and phosphor ( 33 );
the conduit ( 32 ) is provided with a cavity for placing the phosphor ( 33 ); and
the nozzle ( 31 ) is arranged on a wall of the conduit ( 32 ) and the nozzle communicates with the cavity of the conduit ( 32 ), and a plurality of nozzles ( 31 ) are arranged along a length direction of the conduit ( 32 ).

4. The automatic test system for the actual stress of the bridge based on the DIC technology according to claim 3 , wherein the plurality of nozzles ( 31 ) are arranged equidistantly.

5. The automatic test system for the actual stress of the bridge based on the DIC technology according to claim 1 , wherein the sliding rail ( 5 ) is fixedly connected to the both sides of the upper wing ( 11 ) through expansion screws ( 7 ).

6. The automatic test system for the actual stress of the bridge based on the DIC technology according to claim 1 , wherein the bracket ( 6 ) comprises a body ( 62 ), and a sliding portion ( 61 ) which is arranged at both ends of the body ( 62 ) and a fixed portion ( 63 );
the sliding portion ( 61 ) is clamped in the sliding rail ( 5 ) and is slidably connected to the sliding rail ( 5 );
the fixed portion ( 63 ) is used to clamp the camera ( 2 ); and
the body ( 62 ) is bent such that the fixed portion ( 63 ) is directly facing the web ( 12 ).

Assignees

• Jsti Group Co Ltd
• Nanjing University Of Technology

Inventors

• Liu Duo
• Zhang Jiandong
• Xiong Hui
• Feng Xiaonan
• Wang Xianqiang
• Lu Jun

Classifications

• G01M5/005 Primary

  by means of external apparatus, e.g. test benches or portable test systems · CPC title

• G01M5/0008 Primary

  of bridges · CPC title

• G01L5/00 Primary

  Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes · CPC title

• G01M5/0041

  by determining deflection or stress · CPC title

• G01M5/0091

  by using electromagnetic excitation or detection · CPC title