Bridge displacement measurement method

Patent metadata

Field	Value
Publication number	US-11713993-B2
Application number	US-202117203799-A
Country	US
Kind code	B2
Filing date	Mar 17, 2021
Priority date	Mar 18, 2020
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A measurement method include a step to obtain observation point information, including physical quantities in association of a plurality of times, via observation devices at observation points of a structure on which a moving object moves, a step to calculate a correction coefficient that corrects the physical quantities based on a plurality of time periods and a reference time periods, a step to calculate a plurality of deflection waveforms of the structure generated by a plurality of parts of the moving object, a step to calculate a second deflection waveform of the structure generated by the moving object by adding the plurality of deflection waveforms, and a step to calculate a displacement of the structure based on the second deflection waveform. The structure is a superstructure of a road bridge or a railway bridge.

First claim

What is claimed is:

1. A measurement method of a measurement device, the measurement device including:
a first observation device disposed adjacent to a first observation point of a structure on which a moving object moves along a first direction, the first observation device being configured to obtain first observation point information, the first observation point information including a plurality of first physical quantities in association of a first plurality of times, each of the plurality of first physical quantities corresponding to a response to an action of each of a plurality of parts of the moving object that passes on the first observation point at each of the first plurality of times;
a second observation device disposed adjacent to a second observation point of the structure, the second observation device being spaced apart from the first observation device along the first direction, the second observation device being configured to obtain second observation point information the second observation point information including a plurality of second physical quantities in association of a second plurality of times, each of the plurality of second physical quantities corresponding to a response to an action of each of the plurality of parts of the moving object that passes on the second observation point at each of the second plurality of times;
a memory configured to store a program; and
a processor configured to execute the program, the measurement method comprising executing on the processor the steps of:
acquiring the first observation point information from the first observation device;
acquiring the second observation point information from the second observation device;
calculating a plurality of first time periods and a first reference time period, each of the plurality of first time periods corresponding to a time period between a first leading time of the first plurality of times to each of remaining times of the first plurality of times, the first leading time being a time at which a leading part of the plurality of parts passes the first observation point, the first reference time point corresponding to a time period between the first leading time and a time at which a total sum of the plurality of first physical quantities is distributed at a first predetermined distribution ratio;
calculating a correction coefficient that corrects the plurality of first physical quantities based on the plurality of first time periods and the first reference time period;
calculating a plurality of first deflection waveforms of the structure generated by the plurality of parts based on the first observation point information, the second observation point information, a predetermined coefficient, the correction coefficient, and an approximate expression of deflection of the structure;
calculating a second deflection waveform of the structure generated by the moving object by adding the plurality of first deflection waveforms; and
calculating a displacement of the structure based on the second deflection waveform,

wherein the structure is a superstructure of a road bridge or a railway bridge.

2. The measurement method according to claim 1 , further comprising:
calculating a plurality of second time periods and a second reference time period, each of the plurality of second time periods corresponding to a time period between a second leading time of the second plurality of times to each of remaining times of the second plurality of times, the second leading time being a time at which the leading part of the plurality of parts passes the second observation point, the second reference time period corresponding to a time period between the second leading time and a time at which a total sum of the plurality of second physical quantities is distributed at a second predetermined distribution ratio,
wherein the correction coefficient is calculated based on the plurality of first time periods, the first reference time period, the plurality of second time periods, the second reference time period, and
the correction coefficient corrects the plurality of first physical quantities and the plurality of second physical quantities.

3. The measurement method according to claim 1 , wherein
when the first predetermined distribution ratio is R:1−R, R is 0.4 or more and 0.6 or less.

4. The measurement method according to claim 1 , wherein
the first observation point is set at a first end portion of the structure, and
the second observation point is set at a second end portion of the structure different from the first end portion.

5. The measurement method according to claim 1 , wherein
the superstructure is a structure across any one of a bridge abutment and a bridge pier adjacent to each other, two adjacent bridge abutments, or two adjacent bridge piers, and
both and portions of the superstructure re located at positions of the bridge abutment and the bridge pier adjacent to each other, at positions of the two adjacent bridge abutments, or at positions of the two adjacent bridge piers.

6. The measurement method according to claim 1 , wherein
the moving object is a railroad vehicle, an automobile, a tram, a construction vehicle, or a military vehicle, and
the plurality of parts are axles or wheels.

7. The measurement method according to claim 1 , wherein
the approximate expression of deflection of the structure is an expression based on a structural model of the structure.

8. The measurement method according to claim 7 , wherein
the structural model is a simple beam that supports both ends.

9. The measurement method according to claim 1 , wherein
the approximate expression of deflection of the structure is an expression normalized by a maximum amplitude of deflection at a central position between the first observation point and the second observation point.

10. The measurement method according to claim 1 , wherein
each of the first observation device and the second observation device is an acceleration sensor.

11. The measurement method according to dam 1 , wherein
each of the first observation device and the second observation device is one of an impact sensor, a microphone, a strain gauge, or a load cell.

12. The measurement method according to claim 1 , wherein
the structure is a structure in which bridge weigh in motion (BWIM) functions.

13. A measurement device comprising:
a memory configured to store a program; and
a processor configured to execute the program so as to:
acquire first observation point information from a first observation device, the first observation device being disposed adjacent to a first observation point of a structure on which a moving object moves along a first direction, the first observation device being configured to obtain the first observation point information, the first observation point information including a plurality of first physical quantities in association of a first plurality of times, each of the plurality of first physical quantities corresponding to a response to an action of each of a plurality of parts of the moving object that passes on the first observation point at each of the first plurality of times;
acquire second observation point information from a second observation device, the second observation device being disposed adjacent to a second observation point of the structure, the second observation device being spaced apart from the first observation device along the first direction, the second observation device being configured to obtain the second observation point information, the second observation point information including a plurality of second physical quantities

Assignees

• Seiko Epson Corp

Inventors

• Kobayashi Yoshihiro

Classifications

• G01G19/035 Primary

  using electrical weight-sensitive devices · CPC title

• G01G19/047

  using electrical weight-sensitive devices · CPC title

• G01M5/0008 Primary

  of bridges · CPC title

• G01G19/024

  using electrical weight-sensitive devices · CPC title