Abstract:

ESDU 81028 provides data for estimating the mean wind (or other fluid) forces and moments on spatial lattice structures such as towers. It can be used in the design of tower-like lattice structures such as communication towers, pylons and masts. The data are also applicable to other types of spatial frames such as crane jibs, gantries and lattice booms but only when normal to the flow. Comprehensive data are provided for space frames of triangular, square or rectangular arrangements of the mean chord (leg) members for flow incidence from 0 degrees to 360 degrees. Individual members may be flat-sided or tubular or a mixture of both. Solidity ratios from 0 to 1.0 are in general catered for. For tubular members, means of accounting for Reynolds number and surface-roughness effects are included. The effect of adding ancillaries to the space frame are accounted for separately. These include aerials, internal frames of tubes or cables, ladders, gantries and the special case of tower-supported stacks.