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Method for measuring bridge influence line in uniform-speed passing of vehicle

A determination method and influence line technology, applied in the field of civil engineering applications, can solve problems such as ill-posed equations, and achieve accurate results.

Active Publication Date: 2018-11-20
NANJING SOUTHEAST BUILD ELECTROMECHANICAL SEISMIC RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: Aiming at the deficiencies in the prior art above, the present invention provides a method for measuring points of bridge influence lines when vehicles pass at a constant speed, which solves the ill-posed problem of solving equations for bridge influence lines, thereby obtaining more accurate bridge influence lines
[0009] Step 1: Determine Influence Line Factor Points for the Test Bridge

Method used

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  • Method for measuring bridge influence line in uniform-speed passing of vehicle
  • Method for measuring bridge influence line in uniform-speed passing of vehicle
  • Method for measuring bridge influence line in uniform-speed passing of vehicle

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Embodiment 1

[0043] like figure 1 Shown, the mensuration method of bridge influence line when the vehicle of the present invention passes at a constant speed, comprises the following steps:

[0044] Step 1: Determine the influence line factor points for the test bridge

[0045] Divide the bridge with a span of L into two ends, A and B, select end A as the upper bridge end of the vehicle, and end B as the lower bridge end of the vehicle, install a dynamic displacement sensor or a dynamic strain sensor at measuring point C, and the sensor sampling frequency is f, the speed of the test vehicle is v, then

[0046] Calculate the spacing of bridge influence line factor points as:

[0047]

[0048] Then calculate the number q of influence line factor points as:

[0049]

[0050] In the formula, Indicates rounding down. In the formula Indicates a vector, the dotted line in the middle cannot be deleted, because it is a whole symbol, and the dotted line is used to fill in the text.

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Abstract

The invention discloses a method for measuring a bridge influence line in uniform-speed passing of a vehicle. Firstly, according to the passing speed of a tested vehicle and sampling frequency of a sensor, influence line factor points of the tested bridge are determined. Then, dynamic displacement or dynamic strain response is acquired for aiming at the measuring point of the to-be-measured influence line. Finally, a vehicle load matrix is constructed and the bridge influence line is solved. The method settles a problem of incapability of realizing well-posed state in a bridge influence line solving equation, thereby obtaining a more accurate bridge influence line.

Description

technical field [0001] The invention relates to a method for measuring points of bridge influence lines when vehicles pass at a constant speed, and belongs to the technical field of civil engineering applications. Background technique [0002] The influence line is an inherent characteristic of the bridge, which has the characteristics of clear physical meaning, sensitivity to damage, and less obvious environmental changes. It contains rich local information of the bridge. The measurement influence line is often included in the bridge completion experiment of the new bridge and the inspection and evaluation of the old bridge. . Based on the measured results of influence lines, the rapid detection of bridge bearing capacity can be further realized. Therefore, accurate determination of the actual influence line of the bridge has important engineering application value for evaluating the performance of the bridge. [0003] At present, domestic and foreign scholars have carrie...

Claims

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Application Information

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IPC IPC(8): G01M5/00
CPCG01M5/0008G01M5/0041
Inventor 丁幼亮魏笑尘万春风
Owner NANJING SOUTHEAST BUILD ELECTROMECHANICAL SEISMIC RES INST
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