In a message dated 11/12/99 8:45:53 AM Eastern Standard Time,
[log in to unmask] writes:

> Ken, is twisting movement lateral or vertical?  Do you mean a tower
structure
>  where height >= 4xwidth, or just any exposed structure?

"I am not an engineer," he said.

Thermal movement occurs in any masonry structure on a daily basis. In a tower
structure >= 4x width or however, the effect is more pronounced & obvious. On
George Rogers Clark monument in Vincennes, Indiana (not a tower) the granite
was cracked through due to daily thermal movements of the structure. The
stones were set back in a manner that allowed for the movement. On San
Jacinto monument all the corner stones were cracked. In this case the
limestone was set in place and the concrete poured in behind it, the
limestone forming a form for the concrete. You got probably both shrinkage of
the concrete and thermal twisting.

Though Michaels's thin stones may be freezin' in Nebraska, he could also be
doin' one of those hyrniatin' gestures known as the twist.

Now, if a REAL structural engineer will speak up you will see just how much
BS I can shovel!

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