A non-contact multi-point high-frequency dynamic bridge deflection detection method
A high-frequency dynamic and bridge deflection technology, applied in measuring devices, instruments, optical devices, etc., can solve the problems of difficult real-time and accurate detection of bridge deflection, and achieve the effects of convenient measurement, real-time monitoring, and automation
Active Publication Date: 2017-10-17
CHANGAN UNIV
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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
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Embodiment
[0063] This embodiment provides a non-contact multi-point high-frequency dynamic bridge deflection detection method, such as figure 1 with figure 2 As shown, the method adopts the following bridge deflection detection system, which is composed of a laser rangefinder 1, a reflective target 2, a communication module 3, a remote monitoring module 4, and a tilt angle monitor 5. There are n laser rangefinders, which are fixed under the beam of the bridge to be measured; the reflective target is fixed at the piers at both ends of the bridge to be measured. The laser rangefinder and the reflector are equipped with inclination monitors. The reflective target includes a support arm and a reflective plate, and the reflective plate faces the laser rangefinder for reflecting laser light. After the remote monitoring module issues a command, n laser rangefinders irradiate the reflective target at the same time, and the communication module is connected to the laser rangefinder, inclination ...
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The invention provides a non-contact multi-point high-frequency dynamic bridge deflection detection method. n laser range finders are installed under the girder, and reflection targets are installed at the bridge pier. When the bridge is not subject to additional load, the laser range finder is turned on. instrument, measure the distance L1 of the laser rangefinder when the bridge is not subject to additional load, and calculate the deflection yi at the bridge position corresponding to each laser rangefinder: Repeat in μ seconds, take one of the end points of the bridge as the coordinate origin O, take the longitudinal direction of the bridge as the X-axis, and take the direction perpendicular to the bridge surface as the Y-axis, input the abscissa xi of the detection point, and the real-time measured deflection value yi , fitting the integrated coordinate data to a deflection curve. It can realize non-contact measurement. Compared with the traditional manual use of dial gauge detection, it can be operated remotely and can be automated, making the measurement more convenient.
Description
Technical field [0001] The invention belongs to the field of bridge monitoring, relates to bridge deflection detection, and specifically relates to a non-contact multi-point high-frequency dynamic bridge deflection detection method. Background technique [0002] Transportation is the artery of economy. For the safety and development of bridge construction, bridge monitoring is essential. The deflection of a bridge refers to the size of the longitudinal linear displacement of the centroid at a certain cross section of the beam in the direction perpendicular to the axis. Once the deflection of the bridge exceeds the allowable range, or cannot be restored 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 commonly used measurement parameter to detect the healthy operation of large bridges, and it is a necessary factor to be considered by the bridge monitoring system....
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IPC IPC(8): G01B11/16
Inventor 韩毅薛诺诺冯彬杨燕雨王文宇
Owner CHANGAN UNIV