I do not recall Interference being taken into account, but we did not allow for shielding. The structure depicted is very difficult to analyse (and build) because it is rigid jointed, by the way. It depends whether the load is tensile, compression or bending etc. Safety factors for structural members are built into codes, and may be about 2. Having found the forces in each member at the Design Wind Speed, the permissible load for any cross section can be found from a design code. This is my recollection from tower design many years ago.
Yes, and don't forget the extra safety factor. In EN (including code for steel towers and masts) they only talk about triangular and squared cross-sections for lattice structures, but I wanted something more general to compare among the different types of cross-sections (triangular, squared, circular, etc.) in a construction context.ĭo you think I would just add all the forces computed for individual isolated elements to obtain the total action of wind on the tower? I wanted to know if there is some code that considers the aerodynamic effects of arranging beams in a circular manner, like in Shukhow towers. In this web the EN principles have been applied to obtain the f orce coefficients for isolated elements. I've found in EN how to obtain the velocities profile v(z) from 0 to 200 m height (z) it depends on roughness and orography. However, I need something more "construction code compliant", like EUROCODE. I know the Hoerner's book about drag, it splits the contributions of each structural member but I think it is mainly intended for aeronautics. The following table, includes the formulas, one can use to calculate the main mechanical properties of the circular section.Hi jrmichler, thanks for the quick response and help! For a circular section, substitution to the above expression gives the following radius of gyration, around any axis, through center:Ĭircle is the shape with minimum radius of gyration, compared to any other section with the same area A. Small radius indicates a more compact cross-section. It describes how far from centroid the area is distributed. The dimensions of radius of gyration are. Where I the moment of inertia of the cross-section around the same axis and A its area. Radius of gyration R_g of any cross-section, relative to an axis, is given by the general formula: The area A and the perimeter P, of a circular cross-section, having radius R, can be found with the next two formulas:
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