Probability-Based Design of Wood Transmission Structures - Volume 1: Strength and Stiffness of Wood Utility Poles

摘要

This report (Volume 1) presents the results of EPRI RP1352-1 which pertain to research on strength and stiffness of wood utility poles. A separate report (Volume 2) presents the analysis and suggested probability-based design procedure of single-pole utility structures. In Volume 1, a summary and statistical evaluation are given of preexisting data on wood pole properties, data which have provided much of the basis for currently established design material properties. Major variables influencing pole strength are discussed for the preexisting data. Final results are organized into a permanent computerized data bank for easy retrieval. Results of a series of nondestructive and destructive tests of full-size transmission poles removed from service are presented. Testing procedures and laboratory facilities constructed for these tests are described. Development of a new nondestructive testing method is described which, when coupled with simulation procedures, is capable of predicting the strength distribution of wood poles in an in-service utility line. Limited test results of full-size transmission poles are summarized. These data confirm the hypothesis that the pole strength reductions which occur with time in service can be quantified in the form needed for input to probability-based design. New methods for calculating the strength of bolted connections in wood pole structural systems are also described.