Concerning lightning damage to a concrete foundation .... ran across the
example in the link below. In this case a concrete guy anchor was damaged. But
looking at the pictures, this might have been caused by moisture entry due to
surface cracking with the lightning strike just finishing it off as the current
pulse turned the moisture into steam. Hard to say.
I think the real question is if a lightning strike can cause internal damage to
a tower concrete foundation that you can not easily detect.
N3AE
http://www.copper.org/applications/electrical/pq/casestudy/a6137/a6137.html
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