Intelligent steel strand tension value correction and calculation method with grating embedded in core wire

Abstract

The invention discloses an intelligent steel strand tension value correction and calculation method with a grating embedded in a core wire, which comprises the following steps of: carving a groove in the core wire of a steel strand, embedding the grating, connecting one end of an optical fiber to the grating, and leading an interface at the other end of the optical fiber to the end part of the steel strand; calculating a strain iteration initial value and a strain iteration final value of the winding wire of the same section according to the parameters of the steel strand before being stressed, the corresponding parameters after being stressed, the strain monitoring result of the core wire of the steel strand in the structural stress process and the actual strain of the winding wire; and calculating the actual tension of the steel strand at the measuring point. The steel strand tension value correction calculation method provided by the invention is clear in mechanics concept, simple to operate, accurate and reliable in result, easy to master by engineering technicians, and applicable to evaluation of monitoring results of cable forces of prestressed concrete bridge steel strands and steel strand inhaul cables.

Description

technical field [0001] The invention belongs to the technical field of bridge detection, and in particular relates to a correction calculation method for the tension value of a core wire embedded grating intelligent steel strand. Background technique [0002] During the construction and operation of prestressed concrete bridges, due to the influence of factors such as construction errors, uncertainty of the role in the operation process, environmental changes, material and structural performance deterioration, the internal force state of the structure changes, and the actual structure Stress levels cannot be mastered. [0003] At present, the commonly used structural stress monitoring methods mainly include: shape memory alloy technology, vibrating wire strain gauge, magnetic flux sensor, etc. Since this type of product will experience zero drift after 3-5 years of installation, which will cause changes in the test benchmark of the sensor itself, it is difficult to apply it...

AI Technical Summary

Problems solved by technology

However, due to the smart steel strand with the core wire embedded in the grating, the monitoring point is the core wire strain. Since the core wire and the winding wire are only in the winding relationship, there is a deformation coordination problem between the two. The strain value of the monitoring point cannot represent The average strain value of each steel wire at the measuring point

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