Title:
Seismic Performance of Precast Unbonded Prestressed Concrete Columns
Author(s):
Ryo Yamashita and David H. Sanders
Publication:
Structural Journal
Volume:
106
Issue:
6
Appears on pages(s):
821-830
Keywords:
column(s); precast; prestressed concrete; seismic performance; shake table testing; unbonded
DOI:
10.14359/51663183
Date:
11/1/2009
Abstract:
Shake table testing and an analytical study were conducted to investigate the seismic performance of unbonded prestressed hollow concrete columns constructed with precast segments. A prototype column was designed based on the current bridge specifications by AASHTO. A one-fourth-scale model column was constructed by match casting. Shake table testing that consisted of 15 runs based on the 1995 Hyogo-Ken Nanbu (Kobe) Earthquake was conducted. The specimen performed very well with essentially no residual displacement and only limited concrete spalling at the base. A parametric study was conducted using a nonlinear twodimensional finite element pushover analysis. An equation to estimate the strain in the prestressing strands was proposed. A simplified method to calculate the load-displacement relationship showed good correlation with the pushover analysis results. Unbonded prestress columns can be designed to provide excellent drift capacity with limited permanent displacements.