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This commonplace offers necessities for the layout of guyed and self-supporting latticed metal electric transmission constructions. the necessities are acceptable for hot-rolled and cold-formed metal shapes. research suggestions are defined for the geometrical configurations presently in use. tactics for the layout of person participants mirror wide event and try out info on steels with yield issues as much as sixty five ksi. Connection layout methods permit the engineer to check connection strength to the main compatible finish and facet distances for detailing. If full-scale constitution trying out is needed, strategies are defined to help in acquiring severe info. layout strategies conceal structural metal individuals and connections utilized in foundations. The remark offers helping historical past facts.
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Extra info for Design of Latticed Steel Transmission Structures (ASCE 10-97)
Example text
1) as members inside triangles formed by primary members. The locations of the joints in any model should be at the intersections of the centroidal axes of the members. Slight deviations from these locations will not significantly affect the distribution of forces. Latticed structures are analyzed almost exclusively as ideal elastic three-dimensional trusses made up of straight members or cables and pin-connected at joints. Such elastic analyses produce only joint displacements, tension, and compression in members and tension in cables; moments from normal framing eccentricities are not calculated in the analysis.
1 End Distance The provisions of this section are applicable to sheared and mechanically guided flame cut ends. 5-1 provides the end distance required for strength. The required end distance is a function of the load being transferred in the bolt, the tensile strength of the connected part, and the thickness of the connected part. Test data confirm that relating the ratio of end distance to bolt diameter to the ratio of bearing stress to tensile strength gives a lower bound to the published test data for single fastener connections with standard holes (Kulak et al.
2. (a) Tension-CompressionSystem; (b) Tension-Only System those of the manual methods. The engineer should determine and document why the differences exist before proceeding with the new analysis. If the tower is to be upgraded and new design-factored loads specified, then it is normally more cost-effective to rely on a computer analysis. A correlation of past model assumptions with present model assumptions should be performed for the entire structure. Detail drawings should be reviewed to ensure that members and connections are in agreement with the original design drawings.