Browsing by Author "Ganadhiepan, G"

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    item: Conference-Abstract
    Analysis of space trusses
    Ganadhiepan, G; Jayasinghe, JPLM; Baskaran, K
    Steel towers play a vital role in the telecommunication and power transmission sectors. These towers are usually classified as space trusses, which are amongst the most difficult structures to analyse. Many steel tower failures have happened around the world in the past. Failures of these towers not only result in direct losses but also affect the well-being of people, economy, productivity and growth of a country. According to the recent studies on full scale transmission tower tests at the Structural Engineering Research Centre in Chennai, it has been observed that several towers fail prematurely under normal loading conditions during full scale tests, indicating the need of strength esessment.Computer based finite element analysis is the most widely used method. Although computer based analysis can be accurate and time saving, such analysis outputs willnot be of much value if the engineer cannot ascertain the validity of the outputs. The general methods of manual analysis are not appropriate for the analysis of complicated space trusses such as transmission or telecommunication towers. Therefore, there is a need for a method to manually analyse complicated space trusses. This paper presents a method combining tension coefficient method and Castigliano’s theorem for the analysis of space trusses. A physical tower model tested at the Structural laboratory of University of Moratuwa and analysed using finite element method The outputs of the physical model test and the software analysis were compared with the results of the identified method It was found that the manual method results was were in good agreement with those of the physical model test and the software analysis. This paper shows the potential of this method as a simple tool to check the outputs of computer software model analyses.
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    item: Conference-Full-text
    Comparative Study On Strengthening Methods Of Steel Towers
    (2014-06-09) Ganadhiepan, G; Baskaran, K
    Steel towers are widely used in the telecommunication and power transmission sectors. Failure of these towers causes direct and indirect losses and disruption to the services provided by those towers. As a result, industries and general public face difficulties and the productivity of the country also gets affected. Considerable number of tower failures has taken place in both power transmission and telecommunication sectors of Sri Lanka in the recent past but only a little amount of studies has been done so far. Testing at least a tower in a transmission line is mandatory in the power transmission sector of Sri Lanka. Generally these tests are carried out at the Structural Engineering Research Centre in Chennai. It has been observed that several towers fail prematurely under normal loading conditions during full scale tests, indicating lack of strength of towers. The objectives of this study are analysing tested towers using finite element method and comparatively studying different techniques of strengthening of towers. A general purpose finite element analysis program SAP2000 was used for the modelling and analysis of towers. Finite element model of a tower which has been tested to full scale was developed and validated in SAP2000. Then different methods of strengthening were carried out to the validated model to comparatively study the effect of each method on the strength of the tower. The findings are presented in this paper
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    item: Conference-Full-text
    Comparative study on strengthening methods of steel towers
    (Department of Civil Engineering, University of Moratuwa, 2014-03) Ganadhiepan, G; Baskaran, K; Hettiarachchi, MTP
    Steel towers are widely used in the telecommunication and power transmission sectors. Failure of these towers causes direct and indirect losses and disruption to the services provided by those towers. As a result, industries and general public face difficulties and the productivity of the country also gets affected. Considerable number of tower failures has taken place in both power transmission and telecommunication sectors of Sri Lanka in the recent past but only a little amount of studies has been done so far. Testing at least a tower in a transmission line is mandatory in the power transmission sector of Sri Lanka. Generally these tests are carried out at the Structural Engineering Research Centre in Chennai. It has been observed that several towers fail prematurely under normal loading conditions during full scale tests, indicating lack of strength of towers. The objectives of this study are analysing tested towers using finite element method and comparatively studying different techniques of strengthening of towers. A general purpose finite element analysis program SAP2000 was used for the modelling and analysis of towers. Finite element model of a tower which has been tested to full scale was developed and validated in SAP2000. Then different methods of strengthening were carried out to the validated model to comparatively study the effect of each method on the strength of the tower. The findings are presented in this paper.