Method for identifying untensioned support cables based on mixed monitoring in presence of support seat settlement

Abstract

The invention relates to a method for identifying untensioned support cables based on mixed monitoring in the presence of support seat settlement. Whether a mechanical calculation standard model with an updated structure is needed or not is determined on the basis of the mixed monitoring of various kinds of parameters through monitoring the coordinates of a structural support seat, and the structure of the mechanical calculation standard model needs to be updated only when the coordinates of the structure support seat are changed, so a novel mechanical calculation standard model with the structure metered into the settlement of the structure support seat is obtained, and the unit damage monitored quantity change matrices are obtained through the calculation on the basis of the model. According to the approximate linear relationship of the strain current vector and the strain initial vector, virtual unit damage strain change matrices and current virtual damage vector, virtual damaged cables are calculated and identified. The reset virtual damaged cables are untensioned cables, i.e. cables needing cable force regulation after actual damaged cables are identified by a nondestructive detection method, and the cable length needing to be regulated can be determined according to the relationship between the untensioned degree and the virtual damage degree.

Description

technical field [0001] When there is support settlement, the present invention is based on the monitoring of mixed equivalence to identify the cable forces that need to be adjusted in the cable system (referring to all supporting cables) of cable-supported structures (especially large cable structures, such as large cable-stayed bridges, suspension bridges) The supporting cable and the specific cable length adjustment amount are given, which belong to the field of engineering structure safety. Background technique [0002] The cable system is usually a key component of cable structures (especially large cable structures, such as large cable-stayed bridges and suspension bridges). Due to relaxation and other reasons, the cable force of the supporting cables usually changes after a period of time after the completion of the new structure, and the structure has been in service for a long time. Later, the relaxation of the supporting cables will also cause changes in the cable f...

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Problems solved by technology

[0003] Changes in the health status of the supporting cable system (such as slack, damage, etc.) will not only cause changes in the cable force, but also cause changes in other measurable parameters of the structure, such as changes in the cable force, which will affect the cable force. The deformation or strain of the structure will affect the shape or spatial coordinates of the cable structure, and will cause changes in the angular coordinates of any imaginary straight line passing through each point of the cable structure (for example, any one of the tangent planes at any point on the surface of the structure passes through this point The change of the angular coordinates of the straight line, or the change of the angular coordinates of the normal of any point on the surface of the structure), all of these changes contain the health status information of the cable system, so the characteristic parameters of these different types of structures can be obtained. The mixed monitoring of changes can be used to judge the health state of the structure. In the present invention, all the monitored structural characteristic parameters are collectively referred to as "monitored quantities". Since the monitored quantities are composed of a mixture of different types of measurable parameters of the structure, the present invention This is called mixed monitoring. 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 public and effective health monitoring system and method fixed the issue

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