No abstract

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272781&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272781&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

No abstract

An analysis approach to simulate the staged failure mechanism of corrosion affected beam-column subjected to ultimate or seismic load using a simplified non-linear finite element model is proposed. The instantaneous axial and flexural rigidities at the sectional level are transferred to the element level establishing the instantaneous the structure stiffness at each load step. The approach efficiency and accuracy are verified through comparison with available experimental and analytical results. The proposed approach is numerically stable in all studied cases. It is found that the staged failure mechanism of the columns subjected to quasi-static load and cyclic load up to failure can be simulated with high accuracy. It is also found that corrosioninduced damage results in a large drop of the column load and displacement capacities, and a large shrinkage in the hysteretic relationship, which indicates similar drop in the energy absorption capacities of the beam-columns. INTODUCTIONDevelopment of accurate quantitative assessment/evaluation tools that can lead to save fatalities (due to the collapse of aging bridges) and reduce the management cost for North America's aging concrete infrastructure is of a major importance to infrastructures owners, engineers, and researchers. It is challenging though to simplify the mechanical behavior of damaged structures under extreme loading conditions. Beam-columns are identified as the most safety critical elements of the bridge structures, and hence it is the focus of this paper.Beam-columns of aging infrastructure are subjected to service loads, and they are usually affected by progressing reinforcement corrosion that results in staged reduction in their structural capacity. If an over loading situation is expected over the lifetime (for example an ultimate load), then the collapse of the beam-column is more probable. Experimental investigations show that reinforced concrete columns (new or affected by reinforcement corrosion) loaded to failure by concentric or eccentric loads are losing their strength in steps or stages. Each major sign of distress is related to major changes in the beam-column cross section, cracking and spalling, declining of reinforcement cross-sectional area and ductility, reinforcement fracture or bucking, and complete loss of confinement of the core concrete. On the other hand, if the 1036 Structures Congress 2014

No abstract