Estudo de pontes com pré-esforço extradorsal

Miguel João da Silva

Key information

Authors:

Miguel João da Silva (Miguel João da Silva Bárbara)

Supervisors:

José Joaquim Costa Branco de Oliveira Pedro (José Joaquim Costa Branco de Oliveira Pedro)

Published in

10/17/2011

Abstract

This paper develops a detailed study of extradosed bridges. In order to evaluate the influence of geometrical parameters, such as the tower height, the cross-section height and piers features in the structural behavior, in the cost of construction and in the difficulty in designing an extradosed bridge. It provides an extensive summary of 72 extradosed bridges built to-date, illustrating the variety and the high potential of this structural solution. There is always a relation set between this solution, a box-girder bridge and a cable-stayed bridge, comparing quantities of materials and analysing the structural behavior. The main factors that define the design of an extradosed bridge are discussed. A design strategy is determined for the extradosed cables, as well as for all the important elements for the structural behavior of such bridge type. The competitiveness of an extradosed bridge compared to a box-girder bridge and a cable-stayed bridge is established. To achieve this, an extradosed bridge and a cable-stayed one are designed. The design constraints are defined by the location of an already built cantilever constructed box-girder bridge. A comparison is made in terms of material quantities for each solution, as well as its cost, to enable a general analysis of the cost/efficiency of each structural solution.