Abstract (EN)

This theses study the polyhedral aspects of some network design problems, focusing most on the aspects related to connectivity of the substructures necessary to build reliable network applications. At theheart of many different network design applications lies the fact that one must provide a connected subnetwork (which can be viewed as a collection of vertices or edges inducing a connected subgraph) exhibiting other desirable properties, like achieving some level of survivability or robustness, capacity constraints,or other types of budgetary constraints, depending on the context.A majority of the studies conductedand of the algorithms developed tryto take advantage of those particular aspects that differentiate one application from another, and not much attention has been given to the aspectsthat bring together these questions. Most of the studies conducted and the algorithms developed try to take advantage of those particular aspects that differentiate one application from another, and not much attention has been given to the aspects that bring together these questions. Hence, this work tries to develop an unified approach capable of exploring the most pertinent aspects of network design problems hoping that this can lead to thoughtful insights to more specific problems, being a valuable contribution to the research community and it.