High-strength bolts of steel bridges gradually loosen in service. They have to be inspected periodically by experts with hammers. Mitsui Engineering & Shipbuilding Company, Ltd., developed an automatic looseness detector of high-strength bolts. It is not meant to measure the residual axial forces of the bolts, however. In the present study, a system to reason the residual axial forces of high-strength bolts of steel bridges was built based on a neural network with the faculty of pattern recognition, and its reasoning accuracy was verified.

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