2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
NUMERICAL INVESTIGATION OF THE LATERAL RESPONSE OF SINGLE AND DOUBLE CONTROLLED ROCKING STEEL BRIDGE PIERS

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Author(s)
Mr. Ahmad Rahmzadeh, The University of British Columbia (Presenter)
Mr. Faroque Hossain
Mr. Kamrul Islam, Ecole Polytechnique de Montreal
Dr. Shahria Alam, University of British Columbia
Mr. Tremblay Robert, Polytechnique Montreal
Abstract

This paper presents a numerical investigation on the lateral behavior of controlled rocking steel bridge piers. The rocking behavior limits plastic straining in the column as the main cause of damage in the conventional counterparts. To achieve a positive post-uplifting stiffness, the pier is pre-stressed by a post-tensioned (PT) tendon. The system exhibits a self-centering property, unless local buckling occurs near the rocking interface. The lateral response of the system with various diameter-over-thickness ratios is explored using continuum finite element (FE) method. A macro model with two springs at extreme fibers of the column is developed and used to study the effect of modeling approach in the load-displacement behavior. Base and double rocking configurations are considered. It is shown that the simplified uplifting mechanism used in the macro model leads to an overestimation of the lateral load capacity and pre and post uplifting stiffness of the system. The double rocking configuration surpasses the base rocking in the stiffness, lateral load capacity and energy dissipation, however, exerts more demand on the tendon which might result in its failure.