Abstract
Abstract. Due to the development of digital image processing, digital photogrammetry is becoming an interesting research area in the field of structural monitoring in civil engineering. This study presents a photogrammetric measurement technique for concrete wall deformation monitoring in the destructive experiment. The non-contact photogrammetric measurement technique which provides surface deformation, is more flexible than the contacted single-point measurement technique (e.g., linear variable displacement transducers, LVDT). The major steps of the proposed scheme include (1) camera calibration, (2) orientation modeling, (3) 3D dense matching, and (4) filtering and interpolation for surface deformation. This experiment used two non-metric digital cameras to measure the deformation of a concrete wall in destructive experiment. The validation compared the image-derived and ranger-derived displacements during the experiment with mean error and standard errors of 32 epochs were −0.02mm and 0.81mm, respectively. The correlation between image-derived displacement and LVDT-derived displacement was 0.9803. The advantage of photogrammetry is to derive surface deformation which covered the whole wall during the experiment. In summary, this study demonstrated that photogrammetry is a useful measurement technique for concrete wall destructive experiment.
Highlights
In traditional destructive experiment for concrete structures, the displacement of concrete structures caused by external forces is usually measured by the contact instrument such as dial gauges and linear variable displacement transducers (LVDTs)
This type of instrument can accurately measure the displacement inside its linear range, a single instrument can only measure the displacement of a single point, so more LVDT instruments are needed to obtain more measurement points
This study proposed a non-contact photogrammetry scheme to obtain 3D deformation for concrete wall destructive experiments
Summary
In traditional destructive experiment for concrete structures, the displacement of concrete structures caused by external forces is usually measured by the contact instrument such as dial gauges and linear variable displacement transducers (LVDTs). This type of instrument can accurately measure the displacement inside its linear range, a single instrument can only measure the displacement of a single point, so more LVDT instruments are needed to obtain more measurement points. The another concern is the LVDT instrument might be damaged while the concrete is close to failure. Considering the imaging device is more costeffective than the laser unit, this study adopts the photogrammetric measurement technique in destructive experiment
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