A linear model cable force measurement method based on the correction of the magnetic flux method after the anchorage of the cable

A linear model and measurement method technology, applied in the direction of tension measurement, force/torque/power measuring instrument calibration/testing, measuring device, etc., can solve problems such as links and errors that do not take anchorage of cables into account, and achieve the reduction of unnecessary Certainty, the effect of improving the estimation accuracy

Active Publication Date: 2019-12-20
李大军
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  • Application Information

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Problems solved by technology

However, this method does not take into account the link of cable anchorage in actual engineering. Due to the large uncertainty in the influence of anchor loss and boundary condition transformation on cable force estimation after cable anchorage, this method is adopted There will still be some errors in measuring the cable force after anchoring

Method used

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  • A linear model cable force measurement method based on the correction of the magnetic flux method after the anchorage of the cable
  • A linear model cable force measurement method based on the correction of the magnetic flux method after the anchorage of the cable
  • A linear model cable force measurement method based on the correction of the magnetic flux method after the anchorage of the cable

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specific Embodiment 1

[0031] The method for measuring the cable force of the linear model after anchoring the cable based on the magnetic flux method in this embodiment, the flowchart is as follows figure 1 As shown, the method includes the following steps:

[0032] Step a. During the bridge cable adjustment construction process, two or more different cable forces T are applied to the cables i , Respectively calibrated and cable force T i The corresponding n-th order vibration frequency f i1 , F i2 ,..., f in ;

[0033] Step b. According to the linear model before anchoring

[0034]

[0035] Fitting cable force T i About the k-th vibration frequency f ik The linear regression coefficient A before anchoring k And B k ;

[0036] Step c. The cable is anchored at a certain level of tension, and the magnetic flux method is adopted (Hao Chao, Pei Minshan, Qiang Shizhong. A new method for cable-stayed bridge cable force testing—magnetic flux method[J].Highway,2000,(11): 30-31.) Identify the cable force value T ...

specific Embodiment 2

[0047] In this embodiment, the method for measuring the cable force of the linear model after anchoring of the cable is modified based on the magnetic flux method, taking the tension test test of a cable of model PESM-139 as an example to further describe the method of the present invention in detail.

[0048] In this example, the cable is of type PESM-139, with 139 steel wires in section, and the gap and outside are wrapped by polyethylene (PE), such as figure 2 Shown. The cable length l=53.039m, linear density m=42kg / m, cross-sectional area A=5349mm 2 , Limit cable force T lim =8993kN, elastic modulus E=2.0×10 5 MPa. The bending moment of inertia I of the section is a mechanical parameter of the beam.

[0049] Based on the PESM-139 type cable, the implementation effect of this method is verified.

[0050] Step a. During the bridge cable adjustment construction process, two different cable forces T are applied to the cables 1 And T 2 , Respectively calibrate and cable force T 1 ...

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Abstract

The invention provides a measuring method of linear module cable force after pull cable anchoring based on magnetic flux method correction, and belongs to the technical field of civil engineering. According to the method, the second-stage or multi-stage cable force of the pull cable to be measured is recorded in the bridge cable adjustment construction; the vibration frequency of the pull cable in each order at the corresponding stress level is tested, so that the coefficient of the linear module of each order of the pull cable is recognized to determine the linear model of each order before the pull cable anchoring; the cable force value after the anchoring is recognized by the magnetic flux method; the linear module of each order before the anchor cable anchoring is corrected through the corresponding relationship between the cable force of the pull cable after the anchoring and the self vibration frequency in each order; the linear model after the cable anchoring is obtained. In the bridge operation stage, the linear module after the anchoring is used for recognizing the cable force of the pull cable to be measured. The method provided by the invention has the advantages that the high-precision cable force estimation value of the pull cable after the anchoring can be obtained; the problem that in a conventional method, the influences of the pull cable anchoring loss and the boundary change before and after the anchoring on the cable force of the pull cable cannot be accurately recognized is solved; the estimation precision of the cable force after the cable anchoring in the practical engineering is improved.

Description

Technical field [0001] The invention relates to a method for measuring the cable force of a linear model after anchoring the cable based on the magnetic flux method, which belongs to the technical field of civil engineering. Background technique [0002] For cable-supported bridges and externally prestressed bridges, the vibration method cable force measurement is the main method to detect the force state of the cable. This method uses the functional relationship between the cable force and the natural vibration frequency to obtain the tensile force by measuring the natural vibration frequency. Stubbornly. However, when the cable length is relatively short, the boundary conditions of the functional relationship and its own stiffness are more significant, making the relationship between the cable force and the natural vibration frequency more complicated, which directly affects the measurement of this method Accuracy. [0003] In order to solve the problem of low cable force measu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/04G01L25/00
CPCG01L5/04G01L25/00
Inventor 王建飞杨大伟李大军陈少峰王金龙
Owner 李大军
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