Tension test method for stay cable steel strand of partially cable-stayed bridge

Abstract

The invention provides a tension test method for a stay cable steel strand of a partially cable-stayed bridge. A steel strand of a certain length is fixed in the stay cable steel strand of the partially cable-stayed bridge, and the fundamental frequency and bending stiffness of the steel strand are tested, so that the tension of the stay cable steel strand can be calculated based on the cable free vibration computation theory considering the influence of bending stiffness according to the fundamental frequency, bending stiffness, length and quality parameters of the steel strand. By utilizing the test method, the high-precision tension test result of the steel strand can be obtained; and moreover, the test process is convenient, and the test method meets the requirement of tension test in the construction process and operation period of the stay cable steel strand of the partially cable-stayed bridge.

Description

technical field [0001] The invention relates to a tension test method for steel strands of cables of partial cable-stayed bridges. Background technique [0002] The use of steel cables as a tension member can not only give full play to the use efficiency of high-strength materials, but also facilitate the design and construction of bridges. Steel cables have been widely used in arch bridges, cable-stayed bridges and suspension bridges since they were first used in the Brooklyn bridge in the United States in 1883. Due to the small cross-section of the tower body of some cable-stayed bridges, the cables pass through the bridge tower in the form of separate wire tubes, and each separate wire tube passes through an epoxy steel hinge wire. The epoxy steel strands are constructed by tensioning one by one. After the tensioning is completed, they are connected into a whole through cable clamps and put on the outer protective sleeve. Therefore, the bending stiffness and boundary co...

AI Technical Summary

Problems solved by technology

However, the epoxy steel strands of some cable-stayed bridge cables are bound together by cable clamps at both ends, and the length of the cables is relatively short. The influence of bending stiffness and boundary constraints on the natural frequency cannot be ignored, but at present The traditional test method is difficult to accurately identify the bending stiffness of the steel strand of the cable, which leads to the low accuracy of the vibration frequency method in testing the tension of the steel strand of the cable

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