Extreme Bridge Loads
Full Session with Abstracts
340050-10 - The Dynamics of Precast Post-Tensioned Rocking Columns
Friday, April 20
1:30 PM - 5:00 PM
Segmental precast post-tensioned (SPPT) concrete column is a novel structural system that can be used as bridge columns. The rocking mechanism combining with post-tensioned force of SPPT column provides flexible deformation and re-centering capacity. This study examines the dynamic behaviour of segmental precast post-tensioned concrete columns under seismic excitations. The equations of motion of SPPT columns are derived assuming the concrete segments do not slide and are squat so that bending behaviour of each segment is not coupled with rocking behaviour. Conservation of angular momentum is assumed for each impact between segments, as well as between the base segment and the footing. The equations of motion are developed using Lagrange’s method and are solved using Fourth Order Runge-Kutta method. The effects of geometry of segments and post-tension force on the dynamic behaviour are investigated. Recommendations are provided regarding the tendon design, which will result in optimized seismic behaviour of the SPPT column.