MPB,
If I want to eat my cake and have it too (use hot modulus for load and cold modulus for expansion stress), I can run the operating case twice - once using cold modulus for use in the L1-L2 (EXP) scheme, and a second time using the hot modulus to better estimate the operating loads.
If we were talking of an 'unbalanced' system then its not quite the same, a hand calc would be called for.
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