Probability-Based Design of Wood Transmission Structures - Volume 2: Analysis and Probability-Based Design of Wood Utility Structures

摘要

This report (Volume 2) presents the results of EPRI RP1352-1 which pertain to the analysis and probability-based design of wood utility structures. A separate report (Volume 1) describes project research on the strength and stiffness of wood utility poles. In Volume 2, the feasibility of applying a new method of design of single-pole wood transmission structures is established. Background developments are described which form the basis of a proposed probability-based design procedure. An analysis procedure which properly recognizes the nonlinear behavior of unguyed wood poles is described. A computer program (POLEDA-80) provides a practical method of analysis and design of single poles and is described in a user's manual published as Volume 3 of the report. Results of studies conducted to determine the influence of the major variables on the performance of wood utility structures are reported. These results are used, along with appropriate statistical analyses, to establish a new probability-based design procedure. Examples are provided to illustrate the application of the design procedure to various utility line design problems using available load and material property data. Simplified practical design equations are presented for use by utility line designers. Needs for additional and improved load and material property data are listed, which when met will allow full implemen¬tation of the proposed design methodology.