Photostress and New Photo-elastig Coating Technique by in Situ Testing of Bridges
The Photostress and the photo-elastig coating technique weapply the Research Institute of Civil Engineering, Bratislava besides other experimental methods not only for the experimental stress analysis of models in laboratory but also during the construction and testing of bridges in situ. While the photoelastic model is still the only method for three-dimensional analysis, the surface coating technique permits the measurement of surface strains in the elastic or plastic ranges on structures, joints anchoring areas of pre-stressed concrete beams, atc., previously inaccessible to photo-elasticity. The use of experimental stress analysis techniques in situ is expanded in such fields as: establishment of design criteria, reduction of weight and cost of similar new structures or structural elements and improvement of product reliability. The photoelastic coatings, the photostress method combines the best features of strain gages and classical photoelasticity by providing a visible picture of the surface stress distribution of the component and stress distribution which is accurately readable at any point for both direction and magnitude.
KeywordsPrincipal Strain Oblique Incidence Concrete Bridge Gusset Plate Isochromatic Fringe
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