A study on evaluation for residual axial force of corroded high strength bolts

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The residual axial force of corroded high strength bolts has been investigated. The corroded high strength bolts cut out from a collapsed steel girder bridge were classified from the viewpoints of shape and thickness reduction of nut. The results showed that the residual axial force seems to be affected by the shape, in addition to the thickness reduction. It was analytically indicated that the decrease in an axial force by the thickness reduction is caused by the local deformation of nut edge and hole ci rcumference of splice plate. Moreover, it was revealed that the measurement of the thickness reduct ion near the washer can evaluate the residual axial force.