Design and Analytical Validation of Post-tensioned Column Bases

A post-tensioned (PT) column base connection for use in a seismic resistant PT frame is presented. The PT column base connection allows for self-centering behavior of columns (i.e., returns to its original position with negligible residual drifts). The PT column base connection consists of PT high strength bars, buckling restrained steel plates, reinforcing plates, keeper plates and shim plates. This paper will discuss design considerations for the PT column base connection based on a performance-based design approach, and evaluate the PT column base connection using validated finite element (FE) models.