Several Questions Regarding Tower Design II
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1. The standards for towers specify that the design temperature for the skirt should be determined by taking the lowest value of the monthly average minimum temperatures in the area of use, and then adding 20 degrees. I wonder why the highest value of the monthly average maximum temperatures isn’t used instead. Also, is it necessary to conduct impact tests when the temperature is below zero? 2. The standards state that when the design temperature is below 20 degrees, the allowable stress value should correspond to that of 20 degrees. But how low can this temperature go below 20 degrees? Is it possible to use the values applicable at 20 degrees even when the temperature is -100 degrees?
Returning to the original poster’s first question, I suggest reading the explanatory notes for standard JB/T 4710-2005; the section titled “3 Design Temperature” provides a clear explanation for your question. As for the second question, please read carefully the section “4 Materials” in GB150-1998. The material values listed in those tables require stress values – so how are these values determined when the temperature is below 20 degrees? This post was last edited by www557 on 2009-2-28 at 22:05