A Stress Detection Method for Prestressed Tendons
A prestressed tendon, stress detection technology, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problem that the effective stress of the prestressed tendon cannot be accurately obtained.
Active Publication Date: 2022-04-15
河南牛帕力学工程研究院
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Problems solved by technology
[0005] The purpose of the present invention is to provide a stress detection method for prestressed tendons to solve the technical problem that the effective stress of prestressed tendons cannot be accurately obtained in the prior art
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Embodiment Construction
[0030] Embodiment 1 of the stress detection method in the present invention is as Figure 3-4 Shown:
[0031] The method includes the following steps: the tensioning structure of the tensioning device tensions the prestressed tendons on the outside of the working anchor, the displacement change S of the tensioning structure is measured by the first displacement sensor during the tensioning process, and the tension is measured by the load cell The output tension F of the tensioning device during the pulling process 外 , the relationship curve between the output tension force and the displacement change of the tension structure is composed of the first steady state section, the second steady state section and the unsteady state section connected between the first steady state section and the second steady state section. A steady state segment, F外 内 ;The second steady-state segment, F 外 =F 内 ; The non-steady-state segment is from F 外 =F 有 Start, until the working anchor piece...
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The invention relates to a stress detection method for prestressed tendons. The relationship curve between the output tension force and the displacement change of the tension structure is composed of a first steady state section, a second steady state section, and a connection between the first steady state section and the second steady state section. Unsteady-state segments between segments constitute, in the first steady-state segment, F 外 <F 内 ;The second steady-state segment, F 外 =F 内 ; The non-steady-state segment is from F 外 =F 有 Start, until the working anchor piece and the anchor plate are separated, F 内 Indicates the tensile force generated by the prestressed tendon inside the working anchor, F 有 Indicates the effective stress of the prestressed tendon, the linear equation of the first steady state segment: y=k 1 x+b 1 (1), the linear equation of the second steady-state segment: y=k 2 x+b 2 (2), in formula (1) and formula (2), x corresponds to the abscissa S, and y corresponds to the ordinate F 外 , the value of y at the intersection of formula (1) and formula (2) is F 有 . The invention solves the technical problem that the prior art cannot accurately obtain the effective stress of the prestressed tendons.
Description
technical field [0001] The invention relates to a method for detecting the stress of prestressed tendons in the technical field of prestressed stretching. Background technique [0002] Prestressed construction technology is widely used in road and water transportation, and it is a key factor affecting construction quality. The general structure of prestressed construction is as follows: figure 1 As shown: the prestressed tendon 6 (usually a steel strand) passes through the corresponding concrete 4 (or box girder and other components), the prestressed tendon is connected to the anchor plate 3 through the working anchor piece 2, and the effective stress refers to the penetration in the concrete. The tensile force generated by the elastic deformation of this section of prestressed tendon is equal to the blocking force of the anchor plate to the anchor piece. For the convenience of explaining the problem, in the present invention, this section of prestressed tendon pierced in t...
Claims
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IPC IPC(8): G01L1/00
CPCG01L1/00
Inventor 邵景干尚廷东吴跟上
Owner 河南牛帕力学工程研究院