Abstract
As for the structures built at rapid economic growth, obsolescence is progressing, and the accidents by damage are occurring frequently. As a cause for collapse of a structure, the load stressmore than assumption is considered. The aim of this study is to apply a grazing SH-wave acoustoelastic method to the stress measurement in actual angle steel used in power transmission steel towers. A new-type grazing SH-wave sensor was developed in order to measure the wave velocity of angle steel in a high accuracy. The search of optimal measurement area in stress evaluation and the grinding method for making a smooth measuring plane were also discussed. As a result, stress measurement for the angle steel was enabled, because the part which the influence of the bending is little was able to be found out.
