Analysis of steel transmission pole structures

doi:10.1016/0045-7949(78)90168-2

Computers & Structures

Volume 8, Issue 1, February 1978, Pages 125-133

https://doi.org/10.1016/0045-7949(78)90168-2 Get rights and content

Abstract

The possible use of three different numerical methods of structural analysis is investigated for the analysis of guyed and unguyed steel transmission pole structures. These three numerical schemes are (1) method of finite differences, (2) displacement or stiffness matrix method and (3) Newmark's method of successive approximations. Their relative advantages in terms of ease in problem formulation, computational effort and accuracy of results is indicated. These methods are ued in an iterative form and are easily programmed. Only plane structures are considered and no local buckling is assumed.

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There are more references available in the full text version of this article.

Cited by (5)

Study on mechanical properties and application in communication pole line engineering of glass fiber reinforced polyurethane composites (GFRP)
2023, Case Studies in Construction Materials
Reinforced concrete poles, wooden poles and steel poles are commonly used in communication pole line engineering, but there are numerous shortcomings, which can’t be ignored. In this paper, a scheme of applying glass fiber reinforced polyurethane composites (GFRP) instead of traditional materials to manufacture poles in communication pole line engineering is proposed. The technical properties and bending moment of GFRP poles were studied through material test and bending performance test. Furthermore, Abaqus was used to carry out finite element analysis on GFRP pole, and physical and mechanical properties of GFRP and traditional materials were compared. Referring to GB/T 51421–2020 and DL/T 5219–2014, structural design of GFRP pole and foundation was carried out, respectively. Finally, economic benefit of GFRP pole was analyzed, then an innovative installation method of GFRP pole was proposed. Results show that GFRP has high stiffness, light weight, high strength and durability. Besides, GFRP pole has sufficient flexural bearing capacity, and foundation has excellent overturning stability, which lays a foundation for the application of GFRP in communication pole line engineering.
A study on failure mechanism of self-supported electric poles through full-scale field testing
2017, Engineering Failure Analysis
Citation Excerpt :
Gaylord [3] provided unified design and fabrication recommendations for the self-supporting steel electric transmission poles. Ashok and Biggers [4] investigated the possible use of analyzing tubular steel pole structures of arbitrary geometric configuration with different numerical methods. Vanderbilt and Criswell [5] developed and implemented a reliability-based design method for the analyses of single-pole transmission structures through PDLDAR (Pole Design, Analysis and Reliability).
Self-supported single poles are widely used for transmission of electricity in rural areas of India. Recently, in Unnao District of Uttar Pradesh, India, a large number self-supported poles was found to suffer extensive tilting during wind storms. This incident has raised safety concerns for the Government as well as the company in charge of the construction and installation of the poles. These prestressed concrete poles of about 8.5m height were embedded in the ground by 1.5m as per standard practice. From visual inspection of the failure sites and a detailed geotechnical investigation of soil from 24 nearby boreholes, it seemed that the failures caused primarily due to inadequate resistance from the soft soil of Indo-Gangetic plain, resulting bearing and overturning failures. In order to understand further, a test setup was created at the Institute of Technology Kanpur, where the full-scale poles had been brought from Unnao and were erected in a specifically prepared soil pit to match the in-situ soil condition of the Unnao case-study sites. The poles were erected on compacted silty clay soil deposit by adopting standard procedure of back-filling as used in site. The poles were then subjected to lateral loading and unloading through a specially designed frame. The load capacities of the poles have been found to be in the range of 0.95 to 1.48 times the design wind load for the chosen sites. It is noted that by increasing the footing dimension by only 20%, the capacity of the pole is improved by about 54%. Further, it is also found that by replacing a concrete footing by a compacted brick-stone aggregate grouted footing (a common practice in rural India), no significant alteration in the load capacity or force-deformation behavior is observed. A numerical study was also conducted to understand the experimentally observed behavior. It is found from this study that the analytical model considering nonlinear soil–pole interaction (Case II) showed better prediction of experimental behavior than the fixed base model (Case I). Finally, a sensitivity analysis using First-Order-Second-Moment (FOSM) method indicated that cohesion influences the load capacity of the poles most significantly compared to other soil parameters such as friction angle, unit weight and shear modulus for the chosen soil type and available soil exploration data.
Analytical and experimental studies on 400 and 132kV steel transmission poles
2011, Engineering Failure Analysis
Citation Excerpt :
The pole structures are either connected by a base plate and anchor bolts to the foundation or directly embedded into the soil or into a drilled concrete foundation. The matrix displacement method is most suitable for analysis of multi pole transmission structures [2]. The response of tubular transmission structures to the applied loads is generally nonlinear in nature.
Self supporting lattice type towers are most commonly used for power transmission. It is very difficult to get land in urban areas for installation of conventional lattice towers for power transmission. Poles are suitable alternate supports to the conventional lattice towers. Test results from full scale testing conducted on 400 kV double circuit and 132 kV single circuit self supporting transmission line steel monopoles are compared with the analytical results in this paper. The main shaft is hex decagonal in shape and with tapered cross section and the cross arms and ground wire peaks are of octagonal shape. The shaft is made of five segments and connected by telescoping splices. The monopole is analysed using finite element software. Experiments are conducted to predict the natural frequency of the pole and it is compared with the analytical results. The experimental deformations are 50–60% higher compared to the analytical deformation.
Elastic stability of simple guyed towers
1979, Applied Ocean Research
Results are presented which relate to the elastic stability of towers that are stayed at their tops by clusters of guys. Allowance is made for the self-weight of the tower, the effect that sag has on the stiffness of the cluster of guys is included, and limiting trends in response are explored and explained. A straightforward rearrangement of the parameters permits the inclusion of an external point load at the tower top and, in this form, the work is applicable to the guyed towers planned for the support of production platforms offshore.
An Approach to Develop a Compact Transmission Line Tower with Special 8-Legged Configuration
2019, International Journal of Steel Structures

^†: Research Structural Engineer, Denver Mining Research Center, Bureau of Mines, Denver, Colorado; Formerly Adjunct Assistant Professor, University of Kentucky.

View full text

Analysis of steel transmission pole structures

Abstract

How safe are your poles?

J. Struct. Div. ASCE

Design of multi-level guyed towers: structural analysis

J. Structl. Div. ASCE

How to approach the design of tall guyed towers

Automatic design of guyed masts subject to deflection constraints

Int. J. Numer. Meth. Engng

Analysis of high guyed towers

J. Struct. Div. ASCE

Structural analysis of guyed masts

Design criteria for steel transmission poles

Design of Steel Transmission Pole Structures, by the Task Committee on Steel Transmission Poles of the Committee on Analysis and Design of Structures of the Structural Division

J. Struct. Div. ASCE