Qualification of Autonomous Crack Monitoring Systems

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This thesis summarized the qualification and testing of two commercial Autonomous Crack Monitoring (ACM) systems for use in measuring micrometer displacement of cracks. Qualification involved the assessment of both laboratory and field performance in a residential structure subjected to nearby quarry blasting for the production of roadway aggregate. Aggregate and construction industries are dependant on procedures that cause vibratory ground motion and would benefit from a commercial ACM system. Currently, only research grade equipment is available for ACM monitoring which is expensive, unwieldy and requires specialized knowledge to operate. Performance at three levels of monitoring has been evaluated. During level I monitoring only long term crack displacement response to environmental effects was recorded. During level II monitoring both long term and dynamic (triggered by ground motion) crack displacements are recorded. At the highest level of monitoring, level III, long term and dynamic crack displacements are recorded with dynamic response triggered by crack response and/or ground motion. Crack displacement triggering allows recording of crack responses to occupant activities or other non ground motion events such as wind gusts. Qualification showed that each system was able to sufficiently operate at monitoring and collecting level I crack and environmental responses. Additionally, each system also showed continued progress towards adequate level II operation. Finally, one of the systems was evaluated as a level III system and captured both occupant and environmentally induced crack responses during qualification

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  • 08/14/2017
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