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. This methodology offers a uniform procedure in the industry for calculation of structure loads and strength, and provides a quanti. Wood pole structures can be economically used for relatively shorter spans. Utility designers and engineers can improve productivity, analyze and optimize network performance and reliability. Table of contents for reliabilitybased design of utility pole structures. With its technically innovative subject matter and detailed design examples, this manual will benefit pole manufacturers as well as electrical, structural, and. Probability of failure can be defined as or, using reliability f r r, f s s s, r t e x t p d f o f f a i l u r e r s t e x t t e x t t e x t t e x t t e x t t e x t t e x tt te t text ex t xt t. Guidelines for electrical transmission line structural loading, third edition provides the most relevant and uptodate information related to structural line loading. For reliabilitybased design, a target reliability index of 3. The appendixes 4 and 5 about the reliability software packages proban and strurel are not included in the second edition.
Reliabilitybased design of utility pole structures civil. Steel pole structures are suitable alternate to transmission line towers, due to difficulty encountered in finding land for the new right of way for installation of new lattice towers. This allows rohn to optimize utility pole designs based on customer requirements, manufacturing efficiencies, and material availability. Table of contents for reliabilitybased design of utility. The approach reformulates the problems by replacing reliability terms with deterministic functions. A theoretical analysis of mechanics based models used in conjunction with monte carlo simulation.
Strength of singlepole utility structures publications srs. Reliability is a rapid developing branch changing the approach of the people engineers towards the design. Safety, reliability, risk and lifecycle performance of. The concepts, inspection techniques and management methods described here are based on.
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. Methodology for developing reliabilitybased load and. Reliability is the probability and capability of parts, components, equipment, products and systems to perform their required function for desired periods of time without failure. Asce mop 1112006 reliabilitybased design of utility pole. Pole testing ensures high reliability and long life. Reliability based design of utility pole structures. It can be seen that the reliability indices lie in an approximate range of 2. The concept of safety is based on human safety, with the requirement being safety of. The unguyed single pole transmission structure is widely used to support transmission lines of up to 345 kv capacity. Reliability based design rbd procedures for engineered structures are being developed and quickly gaining acceptance by cade agencies throughout the world.
Rs poles rs poles rs poles composite utility poles. In the past, the utility relied on rules of thumb, experience or hand calculations to determine pole classes, guy wire tensions and conductor clearances. Reliability assessment of electrical overhead distribution. 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. Basis of structural design for buildings and public works.
Reliability based design of utility pole structures provides state of theart 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. Limit state design principles for various line components security classes and design working life more detailed coverage on electrical design and earthing using eg0 risk based earthing approach covers steel lattice, steel poles, concrete poles, wood poles and crossarms handbook hb331 published april 2012. Recommended practice for compliance of large landbased wind turbine support structures figure 1. Reliabilitybased design of utility pole structures asce. 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. Reliabilitybased design of utility pole structures provides stateoftheart technical information on the design of utility pole structures. Whether addressing grid resiliency, smart grid monitoring, or supplying hardware for critical lines, our pioneering products are complemented by our reputation for reliability and performance that exceeds expectations. Reliability based design of utility pole structures, chapter 4. Implemented in program poleda pole design and analysis, this procedure. These design methods were developed according to the following requirements. The rs pole selector is for demonstration purposes only. Reliabilitybased design of utility pole structures provides stateof theart technical information on the design of utility pole structures.
In principle, this basis of structural design requires explicit treatment of. Table of contents for reliability based design of utility pole structures. Based on monte carlo simulations, fragility assessment of the pole wire system is performed for two cases. Another area is the development of the reliability based design concept 6. Analysis and design of singlepole transmission structures. Wood poles have historically been the mainstay of the of utility. Reliability based design optimization of structures using ga and sorm m. Reliabilitybased design optimization of structures using ga and sorm m. That is, proper design of structures should not be based upon an average strength.
Among other useful features, this manual demonstrates how poles differing in material can be designed to equivalent reliability levels, provides means for. Most such structures are wood poles, although prestressed concrete poles and. Among other useful features, this manual demonstrates how poles differing in material can be designed to equivalent reliability levels, provides. Guidelines for electrical transmission line structural. In this manual, we refer primarily to a 5% ltl having a 50% or 75% confidence. Prepared by the reliability based design committee of the structural engineering institute of asce. This basis of structural design for buildings and public works covers structures in general and provides the basic direction for establishing and revising technical standards related to structural design. Methodology for developing reliabilitybased load and resistance factor design lrfd guidelines for ship structures bilal m. Study of electric transmission line deep foundation design. 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, and facilitates innovation and introduction of new. Reliability based assessment of buildings under earthquakes.
Most such structures are wood poles, although prestressed concrete poles and tubular steel poles are sometimes used in high decay or high load situations. The nesc specifies overload factors and strength factors in its strength and loading rules for. Reliabilitybased design of utility pole structures, chapter 4. Reliabilitybased 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. Reliabilitybased design of engineered wood structures.
Reliabilitybased design of engineered wood structures nato. Reliability based design of utility pole structures manual to determine appropriate strength and. The only pole loading guide we had was an old specification sheet that showed the pole class required for different sizes of banked overhead transformers, regardless of other facilities on the. As part of an eightyear effort to develop reliabilitybased design methods for transmission structures, a correct procedure for analyzing and designing singlepole transmission structures was established. 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. Types of deep foundations included in internal design manual. 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. Structural reliability r f s x e s between strength r. Reliability based capacity design for reinforced concrete bridge structures.
The load tests may be in uplift, download, lateral loads, overturning moment, or any necessary. Utility poles learn about rohn traffic poles and engineered. A default assignment of material distribution parameters. Sensitivity based study of the local and global buckling on the seismic response of special concentrically braced frame m. Reliability based design of utility pole structures mop 111 handbook manual guide by american society of civil engineers, 08302006.
Modelbased design for electric utility distribution networks. This book provides stateoftheart technical information on the design of utility pole structures. Reliabilitybased design of utility pole structures. In this paper, a robust approach for the approximate solution of reliability based optimal design problems for series structural systems is developed. 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. Simplified model to predict deflection and natural. May 29, 2017 reliability based design of utility pole structures provides state of theart technical information on the design of utility pole structures. An electric polebased resilience assessment can establish a strong base for prestorm. Reliability based 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, and facilitates innovation and introduction of new. Sensitivitybased study of the local and global buckling on the seismic response of special concentrically braced frame m.
The understanding of transmission line structural loads continues to improve as a result of research, testing, and field experience. 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. The probability of failure is cumbersome to use when its value becomes very small, and it carries the negative connotation of failure. Reliabilitybased design of utility pole structures,isto provide a design methodology for distribution and transmission pole structures that yields relatively consistent reliabilities across all materials. The agh shown is based on a standard embedment assumption of 10% of the pole height plus 2 ft. Reliabilitybased design of utility pole structures manual to determine appropriate strength and. Asce mop 1112006 reliabilitybased design of utility. Members of the nesc have worked closely with the asce in the development of this important document. Rp2011 is a resource for structural engineers engaged in. Conley6 abstract the main objective of ship structural design is to ensure safety and functional. A theoretical analysis of mechanicsbased models used in conjunction with monte carlo simulation. Reliabilitybased design optimization rbdo problem formulation.
The concept of reliability design shall be applied as a. Numerous organizations are involved in the development of national or regional cades without the benefit of interchange of ideas and methodologies. Reliabilitybased design of engineered wood structures in. American society of civil engineers has developed the. In the seismic design of reinforced concrete rc bridge structures, there should be no brittle failures, such as shear failures, in the components, and a plastic hinge should be formed at the bottom of the bridge pier. Methodology for developing reliability based load and resistance factor design lrfd guidelines for ship structures bilal m. Pdf reliability based design of utility poles and nesc. Thus, the american society of civil engineers has developed the reliability based design of utility pole structures manual to determine appropriate strength and loading factors based upon objective reliability criteria. Reliabilitybased capacity design for reinforced concrete. 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. 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 2002 edition of the national electrical safety code provides basic safety rules for outdoor electric power and telecommunications lines and structures. This stamp of quality is present on all of our utility structures.
The calculation of safety 7 factors is referred to as pole loading. The steel poles have tapered cross section and they are generally used for communication, power transmission and lighting purposes. Dependable structures are a priority and we utilize a proprietary design software, developed inhouse and based on extensive testing, for all of our structural designs. Prepared by the reliabilitybased design committee of the structural engineering institute of asce. 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. We take great care in each step of the design and manufacturing process to ensure that our customers. Reliabilitybased design for transmission line structure. Reliabilitybased design of utility pole structures by. Reliability based design of utility pole structures prepared by reliability based design committee of the structural engineering institute free download as pdf file. Utility design 2012 software is a modelbased design solution for electric utility distribution networks that combines design and documentation with standardsdriven workflows and analyses. Lindsey products and systems solve complex problems in the transmission and distribution of electric power. Rohn uses power line systems software coupled with rohndeveloped software for the design of tubular structures and foundations. Frp electrical distribution and transmission structures. In future editions, it is planned to expand this document to cover srbd for other types of utility structures, com ponents and related load.
This basis of structural design for buildings and public works covers structures in general. Reliabilitybased design of utility pole structures, mop 111, provides stateof theart technical information on the design of utility pole structures. Reliabilitybased structural design provides readers with an understanding of the fundamentals and applications of structural reliability, stochastic finite element method, reliability analysis. Sei technical activities division purpose advance structural design by increasing the knowledge of the physical properties of engineering materials, developing methods of analysis, studying the relative merits of various types of structures and methods of fabricating, and disseminating knowledge to the engineering profession. Framework for measuring the resilience of utility poles of an. Reliabilitybased design of utility pole structures mop 111. Reliabilitybased design guidelines for fatigue of ship. 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. Conference proceedings of the society for experimental mechanics series.
A more convenient measure of design risk is the reliability index. Reliabilitybased design of utility pole structures books. Strength of singlepole utility structures publications. This internet publication is the second edition of structural reliability methods and is a corrected and slightly revised version of the. Reliabilitybased design rbd procedures for engineered structures are being developed and quickly gaining acceptance by cade agencies throughout the world.
786 1013 1347 1256 243 58 38 1056 1119 191 872 1263 585 438 1090 1209 745 1151 13 215 990 1131 908 1376 1408 728 650 1087 1459 370 1312 462 459 867 657 237