研究目的
To monitor three-dimensional structural displacements in civil engineering using a stereovision displacement measurement method based on a structure coordinate system, and to validate its effectiveness through a destructive test of concrete beams strengthened with ultraviolet-cured glass fiber reinforced polymer.
研究成果
The proposed stereovision method is effective for monitoring 3D structural displacements in destructive tests, as validated by agreement with LVDT measurements. Sensitivity is improved with reduced field of view and smaller inclined angles. The method can describe static performance and failure modes of strengthened concrete beams, but precision is distance-dependent, requiring appropriate object distance control for field applications.
研究不足
The measurement precision decreases with increased object distance, limiting outdoor applications to distances within several hundred centimeters to several meters. The method requires controlled lighting and may be affected by factors like noise and lens distortion. The inclined angle and field of view significantly influence sensitivity, necessitating careful setup.
1：Experimental Design and Method Selection:
The study employs a stereovision displacement measurement method based on a structure coordinate system, using binocular stereovision principles, image processing algorithms (Canny-Zernike for edge detection, Kalman filtering, and neighborhood searching for tracking), and coordinate transformation to measure 3D displacements.
2：Sample Selection and Data Sources:
Concrete beams strengthened with ultraviolet-cured glass fiber reinforced polymer (GFRP) are used as samples; one beam is kept in indoor environment, and two are immersed in alkaline solution for six months.
3：List of Experimental Equipment and Materials:
Includes universal testing machine (WDW-100D), linear variable differential transformer (LVDT), stereovision system with two CCD cameras (Pike F-100c), computer, synchronizer trigger, tripod, checkerboard pattern, circular targets, halogen tungsten lamp (1300 W), and concrete beams with specific dimensions and materials.
4：Experimental Procedures and Operational Workflow:
The destructive test involves step loading of 1 KN on concrete beams using the universal testing machine, with stereovision system capturing synchronized images at 1 Hz. The structure coordinate system is established using a checkerboard pattern, and image processing algorithms are applied to extract and match circular targets for displacement measurement.
5：Data Analysis Methods:
Displacement data from stereovision and LVDT are compared through load-displacement curves, and sensitivity analysis is performed based on zero drifts.
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