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
Location: 102

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.

Qi Zhang

Ph.D. Student
University of British Columbia

Qi Zhang is a Ph.D. student in Applied Laboratory for Advanced Materials and Structures (ALAMS) at the University of British Columbia. He is also working as a bridge engineer in WSP’s Vancouver office. He received his MASc from the School of Engineering at UBC. His research interests include performance-based seismic design of bridges and self-centering structures.


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340050-10 - The Dynamics of Precast Post-Tensioned Rocking Columns

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