Joint monitoring method for axial-bending deformation of inclined phc square piles based on fbg system

Abstract

The present invention is a joint monitoring method for the axial-bending deformation of the inclined PHC square pile based on the FBG system. The direction in which the pile is subjected to horizontal load and vertical load; S2. Determine the position and number of monitoring points according to the force characteristics of the inclined PHC square pile obtained in step S1, and the monitoring points are arranged along the axial direction of the PHC square pile; S3. In the inclined PHC square pile At the positions corresponding to the monitoring points on the two opposite sides of the square pile subjected to the horizontal load, two FBG sensors are set symmetrically with the axis of the inclined PHC square pile as the axis of symmetry; the monitoring points are placed on any of the remaining two sides of the inclined PHC square pile. One FBG sensor is set at the corresponding position, and the geometric centers of the three FBG sensors on the cross section at the same monitoring point are coplanar. This method can realize the joint monitoring of axial deformation and bending deformation at the same monitoring point.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a joint monitoring method for the axial-bending deformation of inclined PHC square piles based on an FBG system. Background technique [0002] Oblique PHC square piles are widely used in ports, wharfs, bridges and other projects. During use, they are easily subject to horizontal loads caused by earthquakes, shocks, impacts, etc., as well as vertical loads caused by their own weight. Bending and axial deformation are important for pile monitoring. [0003] FBG fiber grating sensing system (abbreviated as FBG system) is widely used in pile foundation detection due to its advantages of moisture resistance, corrosion resistance, high sensitivity and stable detection signal. The FBG system mainly includes a data demodulator and multiple FBG sensors in series. The FBG sensor is used to collect the wavelength of the reflected light at the monitoring point, and transmit the co...

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Problems solved by technology

[0004] The document with the application number 201210476519.8 discloses a method for detecting the stress and strain of PHC pipe pile test piles. This method only arranges FBG sensors on one side of the PHC pipe pile, and can only detect the axial deformation of the PHC pipe pile, but cannot Detect bending deformation, so it cannot fully detect the deformation state of PHC pipe piles

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