Non-contact multipoint high-frequency dynamic bridge deflection detection method

Abstract

The invention provides a non-contact multipoint high-frequency dynamic bridge deflection detection method. N laser range finders are arranged below the bridge; a reflection target is arranged at a pier; when the bridge does not suffer from additional load, the laser range finder is opened, a distance L1 of each laser range finder when the bridge does not suffer from additional load is measured, and deflection yi at the bridge position corresponding to each laser range finder is calculated; within a certain measurement range, the n laser range finders are repeated at a time interval of mu second, one end point of the bridge serves as a coordinate origin O, the longitudinal direction of the bridge is X axis, the downward direction perpendicular to the bridge surface is Y axis, an X-coordinate xi of a detection point and the deflection value yi measured in real time are inputted, and integrated coordinate data are fitted to a deflection curve. Non-contact measurement can be realized, and compared with the traditional mode of manually using a dial indicator for detection, remote operation and control can be realized, automation can be realized, and the measurement is more convenient.

Description

technical field [0001] The invention belongs to the field of bridge monitoring and relates to bridge deflection detection, in particular to a non-contact multi-point high-frequency dynamic bridge deflection detection method. Background technique [0002] Transportation is the artery of the economy. For the safety and development of bridge construction, bridge monitoring is essential. The deflection of the bridge refers to the magnitude of the longitudinal line displacement of the centroid at a certain cross section of the beam body in the direction perpendicular to the axis. Once the deflection of the bridge exceeds the allowable range, or the bridge cannot return to its original position after being subjected to external forces, it can be judged that the bridge has potential safety hazards. Therefore, the deflection change is a common measurement parameter to detect the health and operation status of large bridges, and it is a necessary factor to be considered in the bridg...

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the existing technology, the purpose of the present invention is to provide a non-contact multi-point high-frequency dynamic bridge deflection detection method to solve the technical problem that bridge deflection is difficult to detect accurately in real time

Images