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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

[en] A THEORETICAL - EXPERIMENTAL STUDY OF PRE-STRESSED STAYED STEEL COLUMNS / [pt] ESTUDO TEÓRICO-EXPERIMENTAL DE COLUNAS DE AÇO ESTAIADAS E PROTENDIDAS

RICARDO RODRIGUES DE ARAUJO 29 August 2005 (has links)
[pt] Colunas protendidas de aço representam uma excelente solução estrutural em escoramentos de grandes estruturas e em colunas de estruturas espaciais de apoio a lonas tensionadas de coberturas de grandes vãos. Após um estudo extensivo do comportamento teórico através do uso do programa ANSYS onde avaliou-se a geometria estrutural mais eficiente, níveis de protensão e características dos cabos de aço, foram então definidos os diversos ensaios experimentais a serem executados em colunas com doze metros de comprimento e com tubos de 89,3 mm de diâmetro. A característica inédita deste estudo é a execução de ensaios tri-dimensionais em escala real deste tipo de coluna. Foram executadas comparações de resultados teóricos com os obtidos experimentalmente e foram feitas recomendações de análise e projeto destas estruturas. / [en] Pre-stressed steel columns represent an efficient structural solution for a great variety of temporary/permanent supports systems including large span spatial structures using pre-tensioned fabrics. The first step of the present investigation comprised a painstaking investigation of the structural behaviour of these members with the aid of finite element simulations performed with the ANSYS program. Its results indicated trends for the determination of the most efficient structural geometries, steel ties pre-stressing levels and characteristics. With these results in hand, the investigation proceeded with full-scale experimental tests executed in twelve meters pre-stressed stayed steel columns with an approximately diameter of ninety millimetres. The main contribution of the present investigation was the conception, development and execution of new tri-dimensional full-scale tests for this load bearing systems. The test results enable theoretical and numerical results to be validated against experimental evidence later to be introduced in structural design codes.

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