Stress detection method for prestressed tendons
A stress detection and prestressed tendon 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: 2021-03-09
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, which is characterized in that a displacement change relation curve of output tensioning force and a tensioning structure iscomposed of a first steady-state section, a second steady-state section and an unsteady-state section connected between the first steady-state section and the second steady-state section, and F < outside > is smaller than F < inside > in the first steady-state section; in the second steady-state section, F < outer > = F < inner >; the unsteady state segment starting from F < outer > = F<effective> to separation of the working anchor piece from the anchor plate, wherein the F < inner > represents tension generated by the prestressed tendons on the inner side of the working anchor piece, F <effective > represents the effective stress of the prestressed tendons, a linear equation of the first steady-state section is y = k1x + b1 (1), and a linear equation of the second steady-state section is y = k2x + b2 (2), and in the formula (1) and the formula (2), x corresponds to a horizontal coordinate S, and y corresponds to a vertical coordinate F; and the y value of the intersection point of the formula (1) and the formula (2) is sloved, namely F < effective>. The method solves the technical problem that the effective stress of the prestressed tendon cannot be accurately obtained in the prior art.
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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CPCG01L1/00
Inventor 邵景干尚廷东吴跟上
Owner 河南牛帕力学工程研究院