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- W622802140 abstract "A field demonstration of nondestructive evaluation using thermography was undertaken at an interstate highway bridge to assess the ability of this emerging technology to define the state of stress in geometrically complex regions of large structures undergoing random loading. Thermographic Stress Analysis (TSA), which uses infrared sensing to construct an image of surface stresses by measuring the small thermoelastic temperature changes at many positions over the surface of a region of interest, has previously been proven to be reliable, but only in laboratory situations for relatively small frames under constant-amplitude loading. The results obtained during the field demonstration revealed that quantitative stress analysis may be accomplished while relying solely on randomly applied, short-duration loads from trucks to produce the necessary changes in stress. Relative stress maps were produced by examining a collection of response ratios, each formed by dividing the temperature change occurring at a point of interest by the temperature change that occurred simultaneously at a remote reference location. Knowing how the stress at each point compares to the stress at the reference location, one also knows how the stresses compare to one another. Subsequently, from output obtained at one strain gage located within a region of interest, for any load event one knows the stresses produced throughout the region. Small stresses and sporadic truck traffic hinder efficient application of the current generation of TSA technology, primarily because it may take several hours to conduct one scan with a single-detector TSA camera. Existing TSA technology would be especially useful for a laboratory evaluation of alternative rehabilitation schemes for troublesome bridge details. A multiple-detector camera, currently being developed by Stress Photonics, Inc., under sponsorship by NASA, will remove many of the obstacles to efficient field application." @default.
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- W622802140 date "1993-12-01" @default.
- W622802140 modified "2023-09-27" @default.
- W622802140 title "FIELD DEMONSTRATION OF NON-DESTRUCTIVE BRIDGE EVALUATION USING QUANTITATIVE THERMOGRAPHIC STRESS ANALYSIS. FINAL REPORT" @default.
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