Measuring method of linear module cable force after pull cable anchoring based on magnetic flux method correction
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A technology of linear model and measurement method, applied in tension measurement, force/torque/work measurement instrument calibration/test, measurement device, etc. Determinism, the effect of improving estimation accuracy
Active Publication Date: 2017-05-31
哈尔滨开博科技有限公司
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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
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specific Embodiment 1
[0031] The method for measuring the linear model cable force after cable anchorage corrected based on the magnetic flux method in this embodiment, the flow chart is as follows figure 1 As shown, the method includes the following steps:
[0032] Step a. During the bridge cable adjustment construction process, apply two or more different cable forces T to the cables i , respectively calibrated with the cable force T i The corresponding n-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 kth order vibration frequency f ik Linear regression coefficient A before anchoring k and B k ;
[0036] Step c, the cable is anchored at a certain tension level, through the magnetic flux method (Hao Chao, Pei Minshan, Qiang Shizhong. A new method for cable force testing of cable-stayed bridges - magnetic flux method [J]. Gonglu, 2000, (11): 30-31.) Identify the cable...
specific Embodiment 2
[0047] In this embodiment, the method for measuring the linear model cable force after cable anchorage corrected based on the magnetic flux method will be further described in detail by taking a tensile test of a cable model PESM-139 as an example.
[0048] In this example, the cable is PESM-139, with 139 steel wires in the cross section, and the gap and the outside are wrapped by polyethylene (PE), such as figure 2shown. The length of the cable is l=53.039m, the linear density m=42kg / m, and the cross-sectional area A=5349mm 2 , the limit cable force T lim =8993kN, elastic modulus E=2.0×10 5 MPa. The section moment of inertia I is the mechanical parameter of the beam.
[0049] Based on the PESM-139 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 calibrated with the cable force T 1 The corresponding n-ord...
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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 cable anchorage corrected based on a magnetic flux method, belonging 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 means to detect the stress state of the cables. This method uses the functional relationship between the cable force and the natural vibration frequency to obtain the tension Solly. However, in the case of a relatively short cable length, the influence of the boundary conditions of the functional relationship and its own stiffness is more significant, making the relationship between the cable force and the natural vibration frequency complicated, which directly affects the measurement of this method precision. [0003] In order to solve the problem of low measurement accuracy of cable force due to the co...
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