Research at the University of Colorado on southern pine and Douglas-fir pilings has determined that the existing building code design stress values of 1200psi and 1250psi, as determined by ASTM D-2899, are substantiated; but testing procedures should be revised. All full size piling tests should be standardized at 1/d ratios of 2:1, or confined tests performed. Also, it has been determined that theoretical design values for timber piling should not be based on the lumber criteria of D-245 and D-2555, but instead should follow the pattern set by engineers in the utility industry for timber poles, in accordance with ANSI 05.1.
Subjects: Pile - Timber
Author: James S. Graham; National Timber Piling Council, Rye, New York
Publisher: DFI