Angle monitoring based loose cable recognizing method applied in supporting seat generalized displacement

Abstract

The invention discloses an angle monitoring based loose cable recognizing method applied in supporting seat generalized displacement. The need of updating a mechanical calculation reference model of a structure is decided by monitoring supporting seat generalized coordinates of the structure, based on angle monitoring, and the mechanical calculation reference model of the structure is updated only when the supporting seat generalized coordinates of the structure vary, so that a new mechanical calculation reference model of the structure included in the supporting seat generalized coordinates of the structure is obtained, and a unit damage monitored quantity variance matrix is obtained by calculating on the basis of the model. A virtual damaged cable can be calculated and recognized according to approximate linear relations between a current strain vector and an initial strain vector, a virtual unit damage strain variance matrix and a current virtual damage vector. After a true damaged cable is identified with a nondestructive examination method, the remaining virtual damaged cables are loose support cables, i.e., cables of which the cable force need to be adjusted, and the cable length needing to be adjusted can be determined according to a relation between the loose degree and the virtual damage degree.

Description

technical field [0001] When there is a generalized displacement of the support (for example, the generalized displacement of the support refers to the linear displacement of the support along the X, Y, and Z axes and the angular displacement of the support around the X, Y, and Z axes; corresponding to the generalized displacement of the support, the generalized coordinates of the support When referring to the coordinates of the support about the X, Y and Z axes and the angular coordinates of the support about the X, Y and Z axes), the present invention identifies cable-supported structures (especially large cable structures, such as large Cable-stayed bridges, suspension bridges) in the cable system (referring to all supporting cables) of the supporting cables that need to adjust the cable force, and give the specific cable length adjustment amount, which belongs to the field of engineering structure safety. Background technique [0002] The cable system is usually a key com...

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. The monitored quantity is not only affected by the health status of the cable system, but also affected by the generalized displacement of the cable structure support (which often occurs). None of the public, effective health monitoring systems and methods address this issue