Novel method for inverting bridge bearing capacity by ground-based radar

Abstract

The invention provides a novel method for inverting bridge bearing capacity by a ground-based radar. The method comprises the following steps: scanning a bridge by utilizing the ground-based radar, combining continuous waves with frequency modulation and an interferometry technology to detect strain conditions of the bridge at any moment and at any position, and obtaining a displacement time sequence chart, a displacement time series spectrogram, an amplitude spectrogram, a time-domain deflection form chart, a frequency-domain deflection form chart of bridge monitoring sites; and providing a theoretical basis for bridge bearing safety according to the actual bridge bearing capacity during a static load test of ground-based radar data inversion and the autodynamic performance and dynamic response data of the bridge structure during a dynamic load test. According to the method disclosed by the invention, other instruments do not need to be installed on the bridge, namely bearing capacityinformation (comprising natural vibration frequency, deflection and the like) at any scanning position of the bridge and under different working conditions can be acquired at precision of 0.01mm, andnon-contact measurement is performed. According to the method disclosed by the invention, static bridge measuring and dynamic monitoring can be realized, the vibration frequency reaching 4000Hz of the bridge can be monitored, and data distortion brought by data conversion among multiple instruments during the traditional monitoring is avoided.

Description

technical field [0001] The invention relates to a new method for ground-based radar inversion of bridge bearing capacity, in particular to a new method proposed in the aspects of ground-based radar measurement of bridge vibration, static and dynamic load state and deflection change, bearing capacity inversion and the like. Background technique [0002] According to my country's "Urban Bridge Inspection and Evaluation Technical Specifications", bridge inspection and evaluation is divided into two parts: bridge structure inspection and bearing capacity evaluation, and bearing capacity evaluation includes static load test and dynamic load test. At present, the main methods and instruments used for deformation monitoring in the bridge industry include tension line method, connected pipe method, video imaging method, industrial optical measurement method, accelerometer, strain gauge, total station, laser interferometer, etc. The foundation settlement of the bridge can be measured...

AI Technical Summary

Problems solved by technology

[0004] In order to effectively solve the high-precision and rapid response of the existing bridge static and dynamic loading test and bridge dynamic monitoring, the present invention provides a new method for measuring bridge stress and strain using ground-based radar

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