Comparativo entre respostas das análises pseudo-estática e dinâmica de uma longarina de ponte rodoviária

Abstract

This work presents a comparative between the results obtained through the static and dynamic analyzes of a girder of road bridge. The design of the elements that make up a simple concrete bridge is made from the internal forces obtained from a pseudostatic analysis, in which the moving loads on the structure are increased by standardized safety coefficients. However, in some situations, the internal forces obtained through a dynamic analysis may differ from those found from the pseudostatic analysis. Thus, this research aims to verify the relation between the responses obtained through the two types of analysis and to certify the use of the safety coefficients instead of the effects resulting from a dynamic loading. For this, the main beams of three concrete bridges, which differ in their total length, were analyzed. The static analysis was developed under the normative guidelines for the design of concrete bridges. The dynamic analysis was performed using Ansys software, where the vehicle load was considered with its temporal variation and modeled for three different speeds. In an overview of the results, all the models presented in the dynamic analysis inferior internal forces to the one of the pseudo-static analysis, as was expected. As a result, it was demonstrated that, for the models of the girders studied, the safety coefficients used were sufficient to overlap the dynamic effects and were shown to be conservative.