FE Simulation of Transmission Tower

Eltaly, Boshra; Saka, Amen; Kandil, Kamel S.

doi:10.1155/2014/258148

Cited by 6 publications

(6 citation statements)

References 13 publications

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“…Connections should therefore be modelled as rigid and members with beam-column elements (Battista, et al, 2003;Albermani, et al, 2009). Slip theoretically may occur in bolted connections and including it in an analysis has been shown to improve prediction of tower deformations, but not affect load-bearing capacity or failure mode significantly (Eltaly, et al, 2014;Jiang, et al, 2011). Hence, joint slip was not included in this study.…”

Section: Structure Assessment Philosophy and Modelling Strategymentioning

confidence: 99%

Climate change and extreme wind effects on transmission towers

Manis¹,

Bloodworth²

2017

Proceedings of the Institution of Civil Engineers - Structures

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Climate change poses a major threat to electricity power infrastructure due to expected increase in magnitude and frequency of extreme storm events. This paper uses a methodology for assessment of the vulnerability of UK transmission tower infrastructure to such events, within a framework of performance based engineering.The challenge of estimating future storm magnitudes is addressed by applying a Change Factor Methodology to present day wind speeds using information provided by 2009 UK Climate Change Projections. A Weibull distribution is employed to obtain wind speeds for storm events at different recurrence intervals. Wind loading on the structure and cables is then determined using Eurocodes, and the structure analysed by pseudo-static finite element analysis, considering material and geometrical nonlinearity as well as linear and nonlinear buckling effects.The outcome of the research is that despite a significant projected increase in wind velocities due to climate change, the typical tower analysed in the study continues to perform satisfactorily at all hazard levels. If this performance can be demonstrated more generally across the UK transmission tower infrastructure network, then it is likely that the cause can be traced back to the high factor of safety applied in the original design of the towers.

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Section: Structure Assessment Philosophy and Modelling Strategymentioning

confidence: 99%

Climate change and extreme wind effects on transmission towers

Manis¹,

Bloodworth²

2017

Proceedings of the Institution of Civil Engineers - Structures

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“…32 kisérletek nagyobb kihajlást eredményeztek, mint az elméleti elasztikus modellek számolási eredményei. Hasonlóképpen fontos kiemelni, hogy a megvizsgált oszlopok 25%-a a számolt kihajlás elérése előtt öszszedőlt, több esetben pedig az elméleti és reális tönkremeneteli mód között is eltérést észleltek [1].…”

Section: Bevezetés: áLtalánosságok a Magasfeszültségű Távvezetékek Taunclassified

“…Az érvényben levő szabvány [1] alapján a magasfeszültségű távvezetékek tartóoszlopai funkcionális szempontból a következő típusokra oszthatók (1. ábra):  tartóoszlopok  felfüggesztett pozícióban elhelyezkedő vezetők, leggyakrabban előforduló típus;  végfeszítőoszlopok  a hálózatok legvégén elhelyezkedő oszlop;  feszítőoszlopok  a vezetők rögzítéséért felelős, szerelési fázisban támasztó szereppel rendelkezik;  sarokfeszítőoszlopok  a hálózat irányváltásait áthidaló oszlop;  beavatkozási oszlopok  javítások esetén ideiglenes szerepet töltenek be.…”

Section: Oszloptípusokunclassified

A magasfeszültségű távvezetékek tartóoszlopainak szerkezetvizsgálata

Feleki¹

2016

MTK

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The paper represents a multidisciplinary approach to structural analysis and reverse engineering of electricity transmission tower structures through the combination of laser scanning technology and buckling analysis methodology. Many power line lattice steel towers were installed 50-60 years ago and are still in use. Even the design methods have been developed, the norms are still lacking precise information in terms of deformation limits and second order theory analysis. Numerous tower types have been analyzed, differences in the global structural behavior of towers have been found.A rácsos acélszerkezetek széles körben használt szerkezettípusok, leggyakrabban a magasfeszültségű távvezetékek hálózataiban fordulnak elő. Ezen hálózatoknak nagyrésze több mint hatvan éve használatban van, többségük szemmel látható károsodásokat szenvedett. Habár a tervezési módszerek fejlődtek, az érvényben levő szabványok számos pontatlanságot tartalmaznak. A dolgozat egy multidiszciplináris szerkezeti analízist mutat be, háromdimenziós térleképző technológia felhasználásával. A módszert sikeresen alkalmaztuk egy sarokfeszítő oszlop elemzésénél, a kihasz-náltsági eredményeket vizsgálva, jelentős eltéréseket észleltünk a szerkezet globális viselkedésében. Kulcsszavak:távvezetékek tartóoszlopai, szerkezeti elemzés, kihajlás vizsgálat, 3D térleképzés.

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“…e postcracking circulatory torsional behavior of RC closed-section structures has been well simulated with the space truss model [9][10][11][12][13][14][15][16]. e nonlinear FEA method was also applied to simulate the circulatory torsional behavior of RC closed-section structures [17][18][19]. As to the postcracking mixed torsional behavior of open thin-walled RC structures, the aforementioned space truss model for circulatory torsion is not accurate anymore due to the considerable warping effect [3,20].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on Mixed Torsional Behavior of U‐Shaped Thin‐Walled RC Girders

Diao

Guo

et al. 2018

Advances in Civil Engineering

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Nowadays, U-shaped thin-walled concrete girders have been widely applied in the urban construction of rail viaducts in China as well as worldwide. However, the mixed torsional behaviors of these structures are not well understood. In this paper, the mixed torsional behaviors of the U-shaped thin-walled RC girders are theoretically analyzed, and a method predicting failure modes and ultimate torques is proposed. Nonlinear FE models based on ABAQUS to simulate the mixed torsional behaviors are built and calibrated with the test results. Parametric studies considering three crucial parameters (boundary condition, span length-section height ratio, and ratio of longitudinal bars to stirrups) are conducted based on both the above suggested calculating method and the FE modeling. The calculated and the simulated results agree well with each other and with the test results. It is found that the failure modes of the U-shaped thin-walled RC girders under torsion are influenced by all the three parameters. Three kinds of failure modes are observed: flexural failures dominated by warping moment, shear failures caused by warping torque and circulatory torque, and flexural-shear failures in the cases where flexural failure and shear failure appear almost at the same time.

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FE Simulation of Transmission Tower

Cited by 6 publications

References 13 publications

Climate change and extreme wind effects on transmission towers

Climate change and extreme wind effects on transmission towers

A magasfeszültségű távvezetékek tartóoszlopainak szerkezetvizsgálata

Parametric Study on Mixed Torsional Behavior of U‐Shaped Thin‐Walled RC Girders

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