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 objectiveto reduce structural demand and damage of an existent bridge in Mendoza,Argentina, with post-tensioning reinforced concrete girders that are a commonstructural typology in the region. A numerical study was carried out with thispurpose. The numerical model was calibrated against experimentalmeasurements of vibration natural frequencies. The alternatives studied are:a) classical reinforcement of the structural overall stiffness; b) tuned massdampers; c) viscous dampers; d) metallic dampers. The model is subjected toreal near-fault seismic records, thereby obtaining response parameters toevaluate the efficiency of each protective system. The response is evaluated notonly in terms of reduction of displacements, but also in increasing of shearforce in key elements, which is a negative characteristic of some of the systemsstudied. Advantages and disadvantages of each studied system are highlighted.