Abstract
Because the existing diagnosis methods of concrete dam crack behavior abnormality are mostly based on a single measurement point of crack opening. The idea of diagnosing concrete dam crack behavior by use of comprehensive amount of crack information of multiple measurement points was proposed. First, the method of transforming crack opening variation into amount of crack information was studied according to the idea above. Then the determining method of weight of each crack opening measurement point making use of Projection Pursuit Method was researched. Next, amount of crack information of multiple single measurement point was synthesized into comprehensive amount of crack information. At last, on the basis of cloud model theory, two kinds of crack behavior abnormality diagnosis criterion including criterion of all the data sequence of amount of crack information and criterion of considering the difference between historical data and current data of amount of crack information were established. Accordingly, cloud model diagnosis method of crack behavior abnormality was built. The case study shows that the cloud model diagnosis method can objectively analyze the contribution and impact of historical and current data on the results, and it is reasonable and feasible.
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