Resumo

RIVERA VARGAS, Darío  e  MELI PIRALLA, Roberto. Procedimiento de diseño sísmico de columnas de puentes urbanos de concreto reforzado. Ing. sísm [online]. 2008, n.79, pp.1-23. ISSN 0185-092X.

A displacement-based approach for seismic design of reinforced concrete bridge columns is proposed, in which the fulfillment of two levels of performance is sought: serviceability and survival. Displacement capacity of rectangular and circular columns is computed through empirical equations derived in terms of column section, amount of longitudinal reinforcement, level of axial load, ratio of confinement and slenderness of the column. First, the required longitudinal reinforcement is defined, in order not to exceed yielding under the service earthquake; then, the amount of confinement needed to not reach the lateral displacement corresponding to collapse is defined. The performance of columns designed with this procedure is compared with the results of step by step analyses for ground motions representative of the two levels of design for the zone of soft soil in Mexico City.