Evaluation of classical reinforcement and passive control systems on a reinforced concrete bridge subjected to seismic loading

Abstract

In this paper, different strategies are studied with the main objective to reduce structural demand and damage of an existent bridge in Mendoza, Argentina, with post-tensioning reinforced concrete girders that are a common structural typology in the region. A numerical study was carried out with this purpose. The numerical model was calibrated against experimental measurements of vibration natural frequencies. The alternatives studied are: a) classical reinforcement of the structural overall stiffness; b) tuned mass dampers; c) viscous dampers; d) metallic dampers. The model is subjected to real near-fault seismic records, thereby obtaining response parameters to evaluate the efficiency of each protective system. The response is evaluated not only in terms of reduction of displacements, but also in increasing of shear force in key elements, which is a negative characteristic of some of the systems studied. Advantages and disadvantages of each studied system are highlighted.