Skip to main content

Two-Dimensional Analysis of Logging Tail Spars

The full text article is temporarily unavailable.

We apologise for the inconvenience. Please try again later.

A beam-column analysis of a skyline-logging tail spar was formulated and an example analysis made of a second-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) spar (15.-in. dbh) rigged at 40 ft. The analysis takes into account the taper of the spar tree, the flexibility of the base of the spar, and the eccentric restraining load at the top provided by guylines. Allowable skyline tension on the tail spar is shown to vary with skyline angle and guyline pretension. An optimum guyline pretension that produces the greatest capacity in the spar tree was found to be within a range attainable by hand tightening. The variation of allowable skyline tension with rigging height and spar diameter also is shown. For. Sci. 33(4):971-983.
No References
No Citations
No Supplementary Data
No Article Media
No Metrics

Keywords: Capacity envelope; beam column; loading envelope

Document Type: Journal Article

Affiliations: Logging Systems Specialists, Umatilla National Forest, Pendleton, OR 97801

Publication date: 01 December 1987

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more