Strength verification of tower equipment
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Dear seniors, I’m a newcomer. Why, in the standard NB/T47041, does the strength verification of tower equipment consider only axial stress and not circumferential stress?
Where did you read that? It should be considered as well. It’s just that both the wind load and seismic load acting on tall towers generate axial stress, while the circumferential effect is minimal
Isn’t calculating the internal pressure of the cylinder equivalent to calculating the circumferential stress?
Whether it is a horizontal vessel or a tower, circumferential stress is first calculated according to GB/T150, and then axial stress is calculated
The calculation of wall thickness based on internal pressure already takes circumferential stress into account, and then axial stress is checked using the wall thickness and other loads; high towers generally experience complex stress conditions in the vertical direction (axially). My personal understanding.
The wall thickness formula is derived based on circumferential stress. In other words, it satisfies the thin-shell model without moments; as long as the calculations are done correctly according to the standards, the resulting thickness will certainly be able to withstand the circumferential stresses caused by the design pressure.
Thank you to the seniors for their answers; I now understand