Out-of-plane frequency method for testing cable force of planar cable rod system

Abstract

The invention relates to an out-of-plane frequency method for testing the cable force of a planar cable rod system, which discloses an out-of-plane frequency method based on the cable force of a pulling cable of an out-of-plane self-oscillation frequency testing planar cable rod system and belongs to the fields of cable force monitoring, state (parameter) identification, health monitoring and the like of the construction phase and the use phase of a cable structure. The method is based on the cable force of the pulling cable of the out-of-plane self-oscillation frequency testing planar cable rod system, and continuous short cables in the planar cable rod system are converted into an out-of-plane long cable, the cable force is determined by measuring the out-of-plane self-oscillation frequency and establishing a cable force-out-of-plane self-oscillation frequency relation formula, and the method concretely comprises the following steps of: 1. carrying out the modal analysis of the finite element model of the planar cable rod system, and determining the out-of-plane calculated length; 2. measuring the out-of-plane self-oscillation frequency of the planar cable rod system; 3. identifying the out-of-plane bending rigidity according to the measured multistage out-of-plane self-oscillation frequency; 4. establishing the cable force-out-of-plane self-oscillation frequency relation formula; and 5. calculating the cable force.

Description

technical field [0001] The invention discloses a cable (such as a steel wire cable, The out-of-plane frequency method of cable forces of steel strands, steel wire ropes and steel tie rods, etc., belongs to the fields of cable force monitoring, state (parameter) identification, health monitoring and other fields in the construction stage and use stage of cable structures. Background technique [0002] The cable in the cable structure is an important part of the structure. The change of the cable force not only affects the configuration of the entire structure, but also affects the internal force of the structure. The failure of the cable will lead to a serious degradation of the structural stiffness and often cause the failure of the entire structure. Therefore, the cable force test of the cable structure is one of the important contents to ensure that the prestress state in the construction stage reaches the design goal and the structural safety in the use stage. [0003] A...

AI Technical Summary

Problems solved by technology

It can be seen that since the longer main cable is divided into several cable sections by the web members (web cables / slings), and the length of the cable sections is short, the bending stiffness cannot be ignored, and the boundary constraints are complicated, it is difficult to adopt the conventional frequency method. Accurately determine the cable force of this type of planar cable-rod system

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