Design of latticed steel transmission structures by American Society of Civil Engineers

By American Society of Civil Engineers

Ready by means of the layout of metal Transmission Towers criteria Committee of the Codes and criteria actions department of the Structural Engineering Institute of ASCE This ordinary presents necessities for the layout, fabrication, and trying out of contributors and connections for latticed metal electric transmission constructions. overlaying guyed and self-supporting buildings, those necessities are acceptable to hot-rolled and cold-formed metal shapes. the traditional specifies the layout standards for constitution componentsmembers, connections, and guysto withstand design-factored quite a bit at stresses forthcoming yielding, buckling, or fracture. This new version, which replaces the former commonplace ASCE 10-97, offers minor alterations to the layout necessities and introduces new sections on redundant individuals, welded angles, anchor bolts with base plates on leveling nuts, and publish perspective member splices. themes contain: loading, geometry, and research; layout of contributors, together with compression participants, rigidity individuals, and beams; layout of connections, together with fasteners, minimal distances, and attachment holes; detailing and fabrication; full-scale constitution checking out; structural individuals and connections utilized in foundations; and caliber insurance and qc. an in depth remark comprises explanatory and supplementary info to aid clients of the normal. additionally, one appendix bargains 17 layout examples, and a brand new appendix bargains assistance for comparing older (legacy) electric transmission towers. regular ASCE/SEI 10-15 is a prime reference for structural engineers designing latticed metal electric transmission constructions, in addition to for different engineers, inspectors, and software officers concerned with the electrical energy transmission undefined.

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6 Material Detail drawings shall clearly specify member and connection materials, such as ASTM specification and grade designation. 7 Weathering Steel If the structure is made of weathering steel, special detailing procedures shall be required; see Brockenbrough and Schmitt (1975) and Brockenbrough (1983). 8 Tension-Only Members Tension-only members shall be detailed sufficiently short to provide draw. Draw must consider the length and size of the member. To facilitate erection, these members shall have at least two bolts on one end.

Upon removal of the applied compressive load, the tension-only member returns to its original position. Experience has shown that maintaining or limiting L/r values of 300 or greater accomplishes the desired performance. In special cases based on structure geometry and loads, some tension-hanger members may not be subjected to compressive forces. 18 (Test Verification); however, L/r values less than 300 for tensiononly members are not appropriate in a general provision. Design of Latticed Steel Transmission Structures Damaging vibration of steel members in latticed towers usually occurs at wind speeds less than 20 mi/h (32 km/h) since a nearly constant velocity is required to sustain damaging vibration.

4 Unsupported Length with Varying Forces The effective length factor (K) for an unsupported length of a member with varying force magnitudes such as for the bracing systems shown in Fig. C3-4 can be determined using Eqs. 7-14b) (Johnston 1988). The change in force at the subpanel point has the effect of providing partial restraint for both rotation and translation at this point. When out-of-plane support is provided and the load in the member is changing, each subpanel of the member should be designed as an individual member with due consideration of any eccentricities when selecting the value of KL/r.

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