Modelagem computacional para projeto de pontes em vigas pré-moldadas com continuidade estabelecida no local

Abstract

This research addresses the use of computational tools for the development of bridge projects with precast beams made continuous. This construction process is detailed to clarify the expected structural behavior and advantages over the usual system of simply supported beams. Fundamental aspects of computer-aided structural analysis are discussed, with emphasis on modeling prestressed and prefabricated concrete bridge superstructures. A general procedure is presented for analyzing stresses and strains in composite sections, from which the hyperstatic moments due to creep, shrinkage, and steel relaxation are determined. Simplified methods are discussed for validating results from computational analyses. An example is provided for the design of prestressed reinforcement in prefabricated girders and their connection for positive moments. The ability to accurately represent construction using a finite element model is demonstrated, extracting necessary information for code compliance checks. The significant impact of time and temperature-dependent phenomena on the long-term structural performance is also emphasized