AE OBSERVATION IN THE PULL-OUT PROCESS OF SHALLOW HOOK ANCHORS

Abstract

A source inversion procedure for determining crack types and crack orientations is proposed as the quantitative waveform analysis of acoustic emission (AE), based on the integral representation and the moment tensor. The procedure is applied to AE events monitored during the pull-out tests of hooked anchor-bolts from concrete block.The integral representation is first applied to the stress analysis by the boundary element method (BEM). It confirms that the failure surface is generated as perpendicular to the direction of the maximum tensile stress.AE waveforms detected at five sensor locations during the failure process are analyzed by the source inversion procedure. Crack kinematics determined are in good agreement with experimental findings.