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Procedimentos de cálculo, verificação e detalhamento de armaduras longitudinais na seção transversal em elementos protendidos

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Date
2010-08-24
Author
Faleiros Junior, José Herbet
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Abstract
The following paper presents methods of calculation, verification and detailing of prestressed longitudinal reinforcement in cross sections of elements subjected to bending conceptualizing prestressing systems and its constituent elements, as well as the development of practical examples, calculated and detailed in a didactic manner, seeking an easy understanding and learning. The present study chooses to calculate the longitudinal reinforcement at the ultimate limit state and check it out at the serviceability limit state, always following the current standards. To organize the concepts and cohesion of the information, it is necessary to discuss theoretical and conceptual foundation by assembling several authors who derive about the subject matter. In order to ensure the adoption of normative recommendations (NBR6118:2007 e NBR9062:2005), issues such as durability, cover, classes of environmental aggressiveness, combinations of calculating and limiting values of prestress are discussed. As an example, it is presented a calculation discussion from a structure tailored to different classes of environmental aggressiveness, maintaining its main features, such as: the vain, the cross section and loads. With this work we realize that the calculations are needed, since there is not a situation which determines the scaling of the longitudinal reinforcement. Lastly, we present suggestions for future papers. In order to maintain the geometric features needed to the placement of the active armor on the top edge and on the replacement of the active armor by the passive one at any percentage can only be accomplished in partial prestress. The concurrent examinations may prevent the use of certain sections, for example, when examinations on empty are exclusive, or when the moment value relative to the weight itself is small in relation to the total moment.
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https://repositorio.ufscar.br/handle/ufscar/4654
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Universidade Federal de São Carlos - UFSCar
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