Method for indentifying loose supporting cable based on angle monitoring during support settlement

Abstract

The invention discloses a method for identifying a loose supporting cable based on angle monitoring during support settlement, which is based on angle monitoring, and determines whether to update a mechanical calculation baseline model of the structure through monitoring a structure support coordinate; the mechanical calculation baseline model of the structure is updated only when the structure support coordinate changes, thereby a new mechanical calculation baseline model which is included in the structure of the structure support settlement is obtained, and a unit damage monitored-volume change matrix is calculated and obtained on the basis of the model. According to the approximate linear relationship between the strain current vector and the strain initial vector, the virtual unit damage strain change matrix, and the current virtual damage vector, the virtual damaged cable can be calculated and identified, after the real damaged-cable is identified through a non-damaged test method, the remained virtual damaged cable is the loose cable, the cable force of which needs adjusting, and the cable length needing adjusting can be determined according to the relationship between the loose degree and the virtual damaged degree.

Description

technical field [0001] When there is support settlement, the present invention identifies the cable force that needs to be adjusted in the cable system (referring to all supporting cables) of the cable supporting structure (especially large-scale cable structures, such as large-scale cable-stayed bridges, suspension bridges) based on the monitoring of the angle equivalent The support cable is provided, and the specific cable length adjustment amount is given, which belongs to the field of engineering structure safety. Background technique [0002] The cable system is usually a key component of cable structures (especially large-scale cable-stayed bridges, such as large cable-stayed bridges and suspension bridges). Afterwards, the relaxation of the supporting cable will also cause the change of the supporting cable force. These changes will cause changes in the internal force of the structure, which will have a negative impact on the safety of the structure. In severe cases, ...

AI Technical Summary

Problems solved by technology

[0003] When the health state of the supporting cable system changes (such as relaxation, damage, etc.), in addition to the change of the cable force, it will also cause changes in other measurable parameters of the structure, such as causing arbitrary assumptions at each point of the cable structure. The change of the angular coordinate of the straight line (for example, the change of the angular coordinate of any straight line passing through the point in the tangent plane of any point on the structure surface, or the change of the angular coordinate of the normal line of any point on the structure surface), in fact the structure angle The change includes the health status information of the cable system, that is to say, the health status of the structure can be judged by using the structural angle data, and can be monitored based on the angle (this invention refers to the monitored angle data as "monitored quantity", and " "Monitored quantity" refers to the monitored angle data) to identify damaged cables. In addition to being affected by the health status of the cable system, the monitored quantity will also be affected by the settlement of the cable structure support (which often occurs). At present, there is no A public and effective health monitoring system and method solves this problem

Images