Behavior and load carrying capacity of stump anchors Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r781wk430

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  • Research was conducted to study the behavior and load carrying capacity of stump anchors. A field testing program was undertaken to determine the response and strength characteristics of second growth Douglas-fir (Pseudotsuga menziesii) stumps ranging in diameter from 6 to 17 inches. Horizontal and vertical stump movements due to an applied lateral load were monitored for each test stump until "yielding" occurred. The stumps were then fully uprooted, which enabled the stump-rootballs to be weighed and the rooting systems to be observed. Empirical relationships were developed between tree diameter at breast height (DBH) and weight of the stumprootballs, ultimate load on the stump, and depth to the point of stump rotation. Responses of the stumps under loading conditions were defined by power function relationships correlating applied load with either horizontal stump movement or stump rotation. Normalizing procedures were used to develop general relationships between load and stump movement or rotation. An empirical predictive model was developed incorporating the relationships between normalized load, horizontal stump movement, and DBH. A probabilistic approach to assessing safety was proposed for use in lieu of the conventional factor of safety method.
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