External Prestressing
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Seismic evaluation and partial retrofitting of concrete bridge bents with defect details
Abstract The need for seismic retrofitting of bridges after severe earthquakes has become important in recent years. This study examines the seismic evaluation of concrete bents of highway bridges designed and implemented according to the 1990s regulations. Compared with the older codes, 1990s codes have more complex details for connections which are evaluat
Lat. Am. j. solids struct.. Publicado em: 30/09/2019
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2. Reinforced concrete corbels strengthened with external prestressing
Resumo As estruturas em concreto podem exigir, ao longo de sua vida útil, o aumento da capacidade de carga devido a eventuais mudanças de utilização. Nesse contexto, os consolos podem ser considerados elementos estruturais que apresentam grandes desafios para a instalação de alternativas de reforço. Tal dificuldade é decorrente do fato de que a capac
Rev. IBRACON Estrut. Mater.. Publicado em: 23/09/2019
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3. Some Aspects of Numerical Modeling of Steel-Concrete Composite Beams with Prestressed Tendons
Abstract Aspects about the numerical modeling of three-dimensional prestressed steel-concrete composite beams by using the finite element (FE) method are highlighted and commented in this work. Emphasis is given to the numerical treatment of bonded and unbonded tendons. The proposed modeling technique uses curved beam and catenary elements for simulating int
Lat. Am. j. solids struct.. Publicado em: 15/08/2019
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4. Análise tipológica de elementos e sistemas construtivos pré-moldados de concreto do ponto de vista de sensibilidade a vibrações em serviço / Typological analysis of precast concrete elements and building systems in terms of sensitivity to vibration in service
In the context of construction modernization, the application of precast concrete elements offers a good and reliable alternative in the construction strategy, among them large spans, fast assembly, lightweightness and excellent structural members quality. Dealing about dynamic behavior of concrete structures, precast elements are subjected to several loadin
Publicado em: 2010
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5. Structural behavior of extradosed bridges. / Comportamento estrutural de pontes com protensão no extradorso.
In recent years, external prestressing applied to structures of bridges has experienced exceptional development, permitting a greater freedom in design and, consequently, the appearance of new structural typologies. An exemple of such development is the extradosed bridge, a concept that begins to spread in technical media as a low cost transition between pre
Publicado em: 2006
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6. AnÃlise de adutora aÃrea metÃlica protendida / Analysis of prestressed steel pipeline
The aim of the present work is to present the analysis of the real case of a prestressed steel pipeline. In this solution the steel pipe is the supporting structure with the help of high strength steel cables that are previously prestressed by hydraulic jacks in a configuration designed to exert on the pipe forces that oppose the loading due to the transport
Publicado em: 2004
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7. Estudo das estruturas de membrana: uma abordagem integrada do sistema construtivo, do processo de projetar e dos métodos de análise / Study of membrane structures: an integrated approach of the constructive system, design process and analysis methods
Membrane structures used in roofs are constructive systems formed mainly by structural membrane, which has also the function of sealing. Structural membranes are flexible sheets that resist to external loads due to their form, to their physical characteristics and to their pre-stressing. The pre-stressing of the membrane can be achieved either through its st
Publicado em: 2001
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8. ANÁLISE DO COMPORTAMENTO À FLEXÃO DE VIGAS PROTENDIDAS COM CABOS EXTERNOS SINTÉTICOS / ANÁLISIS DEL COMPORTAMIENTO A LA FLEXIÓN DE VIGAS PROTENDIDAS CON CABLES EXTERNOS SINTÉTICOS / ANALYSIS OF THE FLEXURAL BEHAVIOR OF BEAMS PRESTRESSED WITH EXTERNAL TENDONS
Beams prestressed with external tendons have a number of attractions for engineers. They allow a reduction in weight, since concrete is not provided merely to act as cover to tendon or duct; they allow the tendons to be inspected for signs of corrosion and tendons can be replaced or retensioned if necessary. External prestressing is also an ideal application
Publicado em: 1999
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9. ESTUDIO EXPERIMENTAL DE LA RESISTENCIA A LA FLEXIÓN EN VIGAS PROTENDIDAS CON CABLES SINTÉTICOS EXTERNOS / EXPERIMENTAL STUDY ON THE FLEXURAL STRENGTH OF CONCRETE BEAMS PRESTRESSED WITH SYNTHETIC TENDONS / ESTUDO EXPERIMENTAL DA RESITÊNCIA À FLEXÃO DE VIGAS PROTENDIDAS COM CABOS SINTÉTICOS EXTERNOS
Nos últimos anos a protensão externa tem sido empregada tanto na recuperação e reforço de estruturas existentes quanto na concepção de novas estruturas. A protensão externa pode ser feita com cabos de aço ou com cabos sintéticos. Dentre esses, podem-se destacar os cabos Parafil, cujo núcleo é constituído de fibras kevlar. Essas fibras têm alta
Publicado em: 1997
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10. Contribuição ao estudo das coberturas penseis
This work presents a finite element approach to static and dynamic analysis of counterstressed cable structures. Two nodes, constant strain finite elements are used to model hanging cables, plane prestressed cable trusses and 3-D prestressed cable networks. The two nodes elements are assembled with tniss, beam and frame elements to the static analysis or mix
Publicado em: 1991