By Sotirios J. Vahaviolos
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Additional resources for Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353)
One interesting aspect of the examination was that the cracks grew from the outside and inside of the wall section and met at approximately mid-depth. This indicates that external visual inspection will not necessarily detect cracking if it has initiated on the interior. This also supports the theory that the post may have significant flexural stresses present that cause cracking on the interior as well as the exterior. Finally, the examination indicated that there were no significant weld defects that may have precipitated cracking.
Shigeishi, M. , "Quantitative Evaluation and Visualization of Cracking Process in Reinforced Concrete by a Moment Tensor Analysis of Acoustic Emission," Materials Evaluation, Vol. 53, No. 6, June 1995, pp. 751-756. , Okamoto, T. , "Acoustic Emission Evaluation of Structural Integrity in Repaired Reinforced Concrete Beams," Materials Evaluation, Vol. 52, No. 1, Jan. 1994, pp. 86-90.  Murakami, Y. , "Acoustic Emission Evaluation of Structural Integrity in Reinforced Concrete Beams Deteriorated Due to Corrosion of Reinforcement," Progress in AE 8 (JSNDI), Proc.
Both the mast arm and post are tapered sections. The baseplate on the post is bolted Post directly to the foundation anchorbolts. The mast-arm and post are field connected with two thick plates and high FIG. 1--Signalpole configuration. strength bolts (FIG. 2). One plate is welded to a 4-plate box that is, in turn, welded to the post. The other plate is cut and welded to the mast-arm as a socket type connection. All welds are fillet welds. There are generally two different types of connections used, the open and closed box connection.