Metodologia prática para determinação de cablagem em vigas de pontes isostáticas

Resumo

Structural design, in essence, involve choices and definitions among combinations of various
possibilities. They become iterative processes. Thus, an efficient design process will be the one with the least
number of iterations. In this sense, this paper aims to develop a practical methodology for determining the tendons
in prestressed bridge beams. In general, in Brazil, the tendons are defined by methods based on iterative processes,
highly dependent on the experience of the designer. Basically, the process involves the definition of tendons and
section checking. If the expected results are not achieved, the process is repeated. The proposed methodology will
include the determination of the tendons using Magnel diagrams and the definition of the feasible domain, as well
the definition of the limit zone for the prestressing steel, considering isostatic structures. This article refers only to
a methodology for cases of isostatic bridges. The developed proposal can be applied in manual calculations or
inserted in automated routines, in the framework of an application for practical design process as in theoretical
studies.