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Method for evaluating cooperative transformation of asphalt pavement material and optical fiber grating sensor

A fiber grating and asphalt pavement technology, applied to instruments, optical devices, measuring devices, etc., can solve the problem that the data cannot be directly used to evaluate the stress state of the asphalt pavement structure, and achieve the effect of simple force

Inactive Publication Date: 2009-12-02
HARBIN INST OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an evaluation method for the cooperative deformation of asphalt pavement materials and fiber Bragg grating sensors, so as to solve the problem that the data collected by the fiber optic grating sensors embedded in the existing asphalt pavement cannot be directly used to evaluate the stress state of the asphalt pavement structure

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  • Method for evaluating cooperative transformation of asphalt pavement material and optical fiber grating sensor
  • Method for evaluating cooperative transformation of asphalt pavement material and optical fiber grating sensor
  • Method for evaluating cooperative transformation of asphalt pavement material and optical fiber grating sensor

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specific Embodiment approach 1

[0015] Specific implementation mode one: see Figure 1~3 , the method for evaluating the cooperative deformation of the asphalt pavement material and the fiber grating sensor described in the present embodiment is realized according to the following steps:

[0016] Step 1. Implant the sensor into a cuboid mold with asphalt mixture, which is called a beam specimen; design the beam specimen implanted with the sensor as a four-point bending wide beam stress model; compact The asphalt mixture in the cuboid mold makes it truly simulate the asphalt pavement to be tested; the sensor is located at the upper or lower part of the neutral plane of the beam specimen; the corresponding position of the bottom end surface of the beam specimen is equipped with an LVDT displacement sensor; the test conditions The temperature is fixed.

[0017] Step 2. Applying static load step by step on the upper end surface of the beam test piece at the corresponding position of the implanted sensor at inte...

specific Embodiment approach 2

[0024] Specific embodiment 2: In step 1 of this embodiment, the temperatures used in the test are respectively 4°C, 15°C, 25°C, 40°C or 55°C. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: In step 1 of this embodiment, two LVDT displacement sensors are evenly distributed at corresponding positions on the bottom end surface of the beam specimen, and the collected array value is the average value of the two LVDT displacement sensors. This setting makes the measured results more accurate. Other steps are the same as in the first embodiment.

[0026] Examples (see Figure 1~3 ):

[0027] Step 1. Design principle and design form

[0028] a. The design principle, considering that the beam-type specimen is subjected to a load perpendicular to the axial direction, and when the beam body is subjected to bending deformation due to the bending moment generated by an external force, the stress state is simple, and the compression zone at the top of the beam and the tension zone at the bottom are both Obviously, it can better simulate the state of compression and tension in the actual road surface. For this reason, a four-point bending wide beam test ...

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Abstract

The invention discloses a method for evaluating a cooperative transformation of an asphalt pavement material and an optical fiber grating sensor, and relates to a method for evaluating the cooperative transformation of the pavement material and the optical fiber grating sensor. The method solves the problem that data acquired by optical fiber grating sensors embedded in the prior asphalt pavements cannot be directly used for evaluating the stress state of asphalt pavement structures. The method implants the sensor into three middle subsections of a beam specimen by utilizing the characteristics of simple stress of a four-point bending beam specimen, calculates to obtain the theoretical calculation strain according to the deflection and the geometric dimension of a beam based on the assumption of a small-deformation pure elastic beam, modifies acquired data of the implanted optical fiber grating sensor through the theoretical strain obtained by the calculation, provides an evidence for the processing of the acquired data of the optical fiber grating sensors embedded in the prior actual asphalt pavements, and provides an evidence for determining the real stress state of pavement structures, exploring a pavement damage mechanism, perfecting a pavement design theory and a mechanical model, and performing preventative maintenance on the pavement structures.

Description

technical field [0001] The invention relates to an evaluation method for cooperative deformation of asphalt pavement materials and sensors. Background technique [0002] Because the modulus of the fiber grating sensor buried in the actual asphalt pavement is much larger than that of the asphalt pavement material, the cooperative deformation between the asphalt pavement material and the sensor is poor, and the data collected by the sensor cannot be directly used to evaluate the realness of the pavement structure. Therefore, it is very necessary and has strong practical significance to study the cooperative deformation evaluation method of asphalt pavement materials and sensors, which is the premise and basis for solving the application of fiber grating sensors in road surfaces. The evaluation method for the collaborative deformation of asphalt pavement materials and fiber grating sensors is determined, which can ensure the validity of the measured data of the sensors. In orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 董泽蛟田庚亮谭忆秋程小亮
Owner HARBIN INST OF TECH
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