Seeking help with issues in the calculation of ribbed spherical shell domes for storage tanks
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Dear friends: When I followed the GB50341-2014 Design Code for Vertical Cylindrical Welded Steel Oil Tanks to carry out calculations for ribbed spherical dome roofs, I encountered a problem that I couldn’t figure out. In Chapter H.2.2 of this code, within the calculation process for ribbed spherical dome roofs, there are two values: e1 – the distance from the centroid of the combined cross-section formed by the longitudinal ribs and the roof panel to the mid-plane of the roof panel (in mm) ； e2----The distance from the centroid of the combined cross-section of the longitudinal ribs and the top plate in the transverse direction to the mid-plane of the top plate (mm). May I ask how these two values are calculated? ? Assume that the thickness of the roof slab of the ribbed spherical shell vault is 6 mm ； The thickness of the ribs is 10 mm ； The width of the ribs is 80mm ；
It’s about the calculation of combined inertial moments; you can find out by looking at textbooks on mechanics of materials
Just check the content related to mechanics of materials calculations
The question here is: how is the cross-sectional length of the top slab determined in the composite section? Is it the intercostal distance? If the spacing between the ribs is this large, can it function as a composite cross-section across the entire length (width)?