Dear Sir,

You are correct in stating that UBC does not directly consider the effect of structural damping as do many of the other wind codes. To be consistent with other wind codes, we allow these values to be entered.

If the stress ratio is greater than 1, I would determine which of the stress components is causing the problem. The program adds the stress components using linear superposition. I might suggest that you send in your file to us for further evaluation if necessary.

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Scott Mayeux
COADE Inc.