Structural behavior of extradosed bridges. / Comportamento estrutural de pontes com protensão no extradorso.
AUTOR(ES)
Daniel Miranda dos Santos
DATA DE PUBLICAÇÃO
2006
RESUMO
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 prestressed concrete bridges and cable-stayed bridges. The idea, which should be attributed to French engineer Jacques Mathivat, consists of using external prestressing at intermediate supports, with the help of small towers. In this work, a comprehensive review of the literature about different types of bridges using prestressing is presented, aiming at the important aspects that help us understand the structural behavior of extradosed bridges. A study of stress fluctuation in prestressing cables is also presented, having in mind fatigue, an extremely important factor. Besides, an ample parametric study of different types of structural arrangements is performed, with the purpose of having a deeper understanding of the structural behavior of extradosed bridges. Analysis of the results led to suggesting some desing criteria.
ASSUNTO(S)
concepção estrutural parametric study bridges structural conception extradosed prestressing protensão extradorsal pontes estudo paramétrico
