![]() Such a system, which must be designed for both new and existing structures, therefore needs to be able to carry out real-time damage assessments in order to inform better-advised decision-making by public officials, for example, commissioning necessary strengthening of decaying structures. ![]() With constantly growing traffic volumes, especially pertaining to cargo and heavy goods transport, putting increasing stress levels on an aging stock of transportation infrastructure (e.g., bridges ) and various changes in current standardizations looming large, calls for the development of a simple and comprehensive monitoring system are growing louder. This holds true for the comparability of the ultrasonic and strain results for both non-cracked and even the cracked state. Under the given methodological premises, additional information is currently required to make quantitative assertions regarding this correlation of ultrasonic and strain results. However, since results did not entail a zero crossing, i.e., neither positive nor negative values were to be calculated, only relative changes in this work displayed staggered over the height of the object under test, are discussed. It was to ascertain that the test specimen can in fact be qualitatively compartmentalized into areas of compression and tension identified via Relative Velocity Changes presented in Attribute Maps. Such analysis comprised the initial non-cracked state as well as later stages with incremental crack depth and quantity. Detected ultrasonic signals were evaluated employing Coda Wave Interferometry. ![]() Thus, measurements collected from a network of selected transducer pairings arranged across the central, shear-free segment of the test specimen, were correlated to their respective strain fields. In order to investigate the influence of mechanical strain on ultrasonic signals, a four-point bending test was carried out on a reinforced concrete beam at Ruhr University Bochum. In order to substantiate this ex ante assessment, the viability of measuring ultrasonic waves as a valid point of reference and inference for structural changes is to be further scrutinized in this work. Due to the high sensitivity of coda waves to the smallest structural alterations such as strain, humidity or temperature changes, ultrasonic waves are a valid means to examine entire structures employing networks of ultrasonic transducers.
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