The objective of this book is to provide the reader with a practical tool for reliability analysis of structures. Reliability based design of utility pole structures provides state of theart technical information on the design of utility pole structures. Pole testing ensures high reliability and long life. This allows rohn to optimize utility pole designs based on customer requirements, manufacturing efficiencies, and material availability. Reliability based design accounts for uncertainties scientifically whereas, deterministic design does not rbd assigns a specific reliability on a design through pf probability of failure it is not bad for a system to have probability of failure, but bad not to know how much. Another area is the development of the reliability based design concept 6.
Pls pole is a powerful and easy to use microsoft windows program for the analysis and design of structures made up of wood, laminated wood, steel, concrete and fiber reinforced polymer frp poles or modular aluminum masts. Utility poles learn about rohn traffic poles and engineered. Reliabilitybased design guidelines for fatigue of ship. Wood pole structures can be economically used for relatively shorter spans and lower. Dagher published by the american society of civil engineers.
Reliabilitybased design of engineered wood structures. This paper will provide a brief overview of the rules applicable to utility poles, summarize recent events and commission proceedings involving utility poles, and recommend opportunities for additional commission action to protect safety and continuity of service in california. A more convenient measure of design risk is the reliability index. The concepts, inspection techniques and management. Reliabilitybased optimal design of steel box structures. The nesc specifies overload factors and strength factors in its strength and loading rules for. Reliabilitybased design of utility pole structures civil. These are 1 reliability analysis of pole type transmission structures 339 secondmoment methods, 2 monte carlo simu lation, 3 numerical integration, and 4 the design point method. Among other useful features, this manual demonstrates how poles differing in material can be designed to. An electric polebased resilience assessment can establish a strong base for prestorm planning. Analysis and testing of a new prototype power transmission structure. The 2002 edition of the national electrical safety code provides basic safety rules for outdoor electric power and telecommunications lines and structures. Among other useful features, this manual demonstrates how poles differing in material can be designed to equivalent reliability levels, provides means for quantifying adjusting reliability, offers design incentives for more reliable poles, and facilitates innovation and introduction of new material.
Reliability based design of utility pole structures mop 111 handbook manual guide by american society of civil engineers, 08302006 skip to content free download asme icc csa astm codes. Prepared by the reliability based design committee of the structural engineering institute of asce. Jul 31, 2014 a brief introduction to utility poles. This methodology offers a uniform procedure in the industry for calculation of structure loads and strength, and provides a quanti. Very slight changes to the design of a component can cause profound changes in reliability, which is why it is important to specify product reliability and maintainability targets before any design work is undertaken. It is the responsibility of the pole suppliers to provide the parameters and supporting documentation for their poles strengths, but it is the responsibility of the design engineer. The annual probability of failure may not exceed requirements based on individual human safety see e.
The lrfd load and resistance factor design format of rbd is used by the aashto specifications, and the major developments relevant to pile design in general and dynamic testing in particular will be presented. Prepared by the reliabilitybased design committee of the structural engineering institute of asce. Among other useful features, this manual demonstrates how poles differing in material can be designed to equivalent reliability levels, provides means for quantifying adjusting reliability, offers design incentives for more reliable poles, and. Chapter 1 reliability engineering basics and optimization techniques table of contents s.
Reliabilitybased design of utility pole structures mop 111 handbook manual guide by american society of civil engineers, 08302006 skip to content free download asme icc csa astm codes. Pdf reliability based design of utility poles and nesc. Reliability based design of utility pole structures,isto provide a design methodology for distribution and transmission pole structures that yields relatively consistent reliabilities across all materials. Wood poles are widely used for overhead distribution system, and constitute an important component of utilities assets.
Introduction to reliability university of tennessee. Reliabilitybased design this is the newly developed design philosophy here, we accept the uncertainties in both demand and capacity parameters however, all these uncertainties are properly accounted for uncertainty in estimating each parameter is quantified the c. Reliabilitybased design of utility pole structures books. Reliability based assessment of buildings under earthquakes. Reliabilitybased design of utility pole structures by habib. Reliability assessment of electrical overhead distribution. Reliabilitybased design of utility pole structures provides stateof theart technical information on the design of utility pole structures. Reliability analysis methods four methods for computing and pf are provided in program poldar. Age alone is not an accurate predictor of which structures may be experiencing corrosion. The probability of failure is cumbersome to use when its value becomes very small, and it carries the negative connotation of failure. In each case study, the objective of the analysis is to minimize weight, while ensuring that deterministic and reliabilitybased constraints on ul. Pole line construction new hampshire public utilities. Handbook manual guide by american society of civil engineers, 08302006. This stamp of quality is present on all of our utility structures.
Reliabilitybased design of utility pole structures prepared by reliabilitybased design committee of the structural engineering institute sei of the american society of civil engineers edited by habib j. While the magnitude variablility of these loads are different within and between geographic regions, their. Reliabilitybased design of utility pole structures among other useful features, this manual demonstrates how poles differing in material can be designed to equivalent reliability levels, provides means for quantifying adjusting reliability, offers design incentives for more reliable poles. In many cases a power line design produced by strictly following the nesc loading and design criteria will deliver a less capable structure with lower factors of safety than would be produced. In future editions, it is planned to expand this document to cover srbd for other types of utility structures, com ponents and related load. Ieee rural electric power conference 2001, pgs c41c46. As previously noted, loads considered in this characterization of pole strength are limited to wind and ice. Reliabilitybased design of utility pole structures. Reliability based design of utility pole structures, 2006 expand all toc search. Table of contents for reliabilitybased design of utility. The presented material is intended to serve as a textbook for a one semester course for undergraduate seniors or graduate students. Structural reliabilitybased design of utility poles and the national. Getting cooperation from landowners and governmental agencies, ensuring franchise agreements are correct with cities and working with the u. Reliability based design of utility pole structures.
Prepared by reliability based design committee of the structural engineering institute american society of civil engineers structural engineering institute. Table of contents for reliability based design of utility pole structures. Therefore, there is a pressing need for quantifying the safety and resilience of the powerwire systems using reliability based methods, such as those used in the current design standards dagher. Pdf the 2002 edition of the national electrical safety code provides basic safety rules for outdoor electric power and. Since they are usually designed based on deterministic approach stipulated. The reliabilitybased structural design formats are more flexible and rational than their counterparts, the working stress formats, because they provide consistent levels of safety over various. The manual reports that when structures are designed. Reliability analysis of poletype transmission structures.
An inherent fe ature of design concerned with performance in the field, as opposed to quality of production conformance to design specs definition reliability is the probability that a system will perform in a satisfactory manner for a given period of time. American society of civil engineers has developed the. Asce mop 1112006 reliabilitybased design of utility. With regard to failure containment, the reliability based design standard specifies only one exception to iec 60826. Reliability based design rbd procedures for engineered structures are being developed and quickly gaining acceptance by cade agencies throughout the world. Reliabilitybased design for transmission line structure.
Forest service to balance its land management concerns with the utilitys needs to protect reliability and public safety all fall into the equation. Reliability based design of utility pole structures manual to determine appropriate strength and. The reliability based structural design formats are more flexible and rational than their counterparts, the working stress formats, because they provide consistent levels of safety over various. Reliability based design of utility pole structures manual of practice no. Once thought to be permanent structures free from maintenance and reliability concerns, steel towers and poles have demonstrated that they do indeed degrade over time as a result of corrosion and mechanical damage. Figure free body diagrams of the first, second, and last pole affected by a line breakage 27. Reliabilitybased design of utility pole structures provides stateoftheart technical information on the design of utility pole structures. Reliabilitybased design of engineered wood structures in. Reliabilitybased design of utility pole structures, mop 111, provides stateof theart technical information on the design of utility pole structures.
Numerous organizations are involved in the development of national or regional cades without the benefit of interchange of ideas and methodologies. Rohn uses power line systems software coupled with rohndeveloped software for the design of tubular structures and foundations. The standard includes a statement about the dfs values that implies. Reliability based design of utility pole structures provides stateoftheart technical information on the design of utility pole structures.
Hydroquebec made a presentation on this project and this technique at the cea technologies conference workshop on utility pole structures held in winnipeg, canada, in june 2002. Reliabilitybased design of utility pole structures provides stateof theart technical information. Study of electric transmission line deep foundation design. Structural reliability based design of utility poles and the national electrical safety code. Framework for measuring the resilience of utility poles of an.