The loading of second-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco): to simulate the forces acting on an intermediate support tree Public Deposited

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  • The comercial thinning of second-growth stands in the Pacific Northwest is becoming increasingly important for satisfying the demand for timber. Cable logging will require the rigging of smaller intermediate support trees rather than those utilized on old-growth timber sales. This paper reports on the results of a study designed to evaluate the ability of second-growth trees to sustain the compressive forces similar to those generated by a cable logging system. The movements of nine trees subjected to increasing amounts of force were measured with two theodolites. The conditions of loading were similar to those imposed on intermediate support trees. The study demonstrates that a tree will continue to move in the direction of its initial lateral movement. Once a tree is bent, the downward compressive force governs the movement of the tree. The results from the study are compared to Euler's design formula. It is suggested that a factor of safety be applied when designing an intermediate support. Additional research is proposed by the author to determine the forces acting on support trees during the actual yarding cycle.
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-05-05T18:10:13Z (GMT) No. of bitstreams: 1 Sedlak, Jerome MF.pdf: 815498 bytes, checksum: 5abed523f795bb84c93053bb5fa693bc (MD5)
  • description.provenance : Made available in DSpace on 2009-05-05T18:10:13Z (GMT). No. of bitstreams: 1 Sedlak, Jerome MF.pdf: 815498 bytes, checksum: 5abed523f795bb84c93053bb5fa693bc (MD5)
  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2009-05-04T20:45:24Z No. of bitstreams: 1 Sedlak, Jerome MF.pdf: 815498 bytes, checksum: 5abed523f795bb84c93053bb5fa693bc (MD5)

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