Abstract:

Precast post-tensioned segmental (PPS) bridge piers mitigate global and local damages of bridge structures through natural hinges. The application of PPS piers has increased recently in Accelerated Bridge Construction (ABC). Therefore, to increase their use in high-seismicity regions, this research examines nonlinear static and dynamic performance of PPS bridge piers with Shape Memory Alloy (SMA) bars through a Finite Element (FE) framework. To investigate the energy dissipation capacity of the PPS piers with SMA, an extensive parametric study performed on the key design parameters including, (i) number of segments or aspect ratio, (ii) length, area, and post-tensioning of the SMA bars, and (ii) area and post-tensioning of the tendon. The results are also compared with the piers without SMA bars. It is shown that an optimal design of the SMA bars is required to reach highest energy dissipation capacity. The effects of the SMA bars on the frequency response functions of the piers are also investigated, and it is observed that, unlike the piers without SMA bars, the sub-harmonics and super-harmonics are not seen in the response of the SMA piers for the drift responses. A significant reduction in the drift responses is also observed for the piers with SMA bars as compared to those without SMA. 

Bio:

Sedef Kocakaplan is an Assistant Professor of Civil Engineering at Bursa Technical University and received her doctorate in Structural Engineering from the University of Texas at Austin, USA. Her current research interests include resilience-based design and structural health monitoring methods for civil engineering structures.

Open to all. Attendees external to Imperial need to register. 

Time: 13:30 pm