Measurement of Deflections in Concrete Beams by Close-range Digital Photogrammetry
نویسندگان
چکیده
This paper describes the use of digital photogrammetry for measurement of deflections in concrete beams during destructive testing. A two-video camera system was used to measure vertical deflections with a precision of ±0.25mm (1σ). The system, network design and processing methods are described in detail. Results are presented from several tests of different types of beams. Some of the advantages over contact methods including three-dimensional measurement of deformation components, unrestricted measurement range and immunity to non-linear systematic errors are demonstrated. Comparison is made of photogrammetric and linear-variable-differential transformer deflection measurements.
منابع مشابه
Estimation of Vertical Deflections in Concrete Beams through Digital Close Range Photogrammetry
Deformation monitoring, and in general structural health monitoring, of civil infrastructure systems is important in terms of both safety and serviceability. Traditionally, large structures have been monitored using surveying techniques, while fine-scale monitoring of structural components has been done with geotechnical instrumentation. This paper reviews the advantages and disadvantages of us...
متن کاملCase Study of Beam Deformation Monitoring Using Conventional Close Range Photogrammetry
Deformation monitoring is an important procedure of measuring the structural health of completed civil engineering structures. Most traditional methods for measuring deflection occurring in structures require periodic access for designated inspectors to the particular area being monitored. As a remote sensing technique, photogrammetry does not need any contact with the objects of interest, and ...
متن کاملDesign and Implementation of an Intelligent Photogrammetric System for Control and Guidance of Reconstructive Surgery
The digital image contains efficient and useful information which enables measurement and data acquisition. One of the methods that facilitate measuring and interpreting objects, using the image solely, is close-range photogrammetry. Among the various fields of science, whenever a precise measurement is required, this approach can be applied. One of these fields is Medical Sciences that due to ...
متن کاملEvaluation of Close-Range Photogrammetric Technique for Deformation Monitoring of Large-Scale Structures: A review
Close-range photogrammetry has been used in many applications in recent decades in various fields such as industry, cultural heritage, medicine and civil engineering. As an important tool for displacement measurement and deformation monitoring, close-range photogrammetry has generally been employed in industrial plants, quality control and accidents. Although close-range photogrammetric applica...
متن کاملRock mass structural characterization via short-range digital photogrammetry
Because of the important role of rock mass structural properties on its mechanical behavior, determining the qualitative and quantitative properties of has been a subject of intense research. In this regard, numerous techniques such as scanline surveying, cell mapping, and geologic structure mapping have been proposed. However, applying such field surveying techniques for rock mass properties i...
متن کامل