Title:
Advances in Post-Tensioned Parking Facilities Seismic Design
Author(s):
M. Iqbal
Publication:
Symposium Paper
Volume:
231
Issue:
Appears on pages(s):
199-218
Keywords:
concrete; design; earthquake; garage; parking; post-tension; prestress; seismic; structure
DOI:
10.14359/14928
Date:
10/1/2005
Abstract:
Post-tensioned concrete is a popular material used in the construction ofparking facilities due to economy and durability it offers. The flooring system in post-tensioned parking facilities generally consists of one-way post-tensioned slabssupported by post-tensioned beams cast monolithic with concrete columns formmoment frames. However, the building codes have restricted the use of post-tensionedconcrete as primary lateral load systems in high seismic regions due to concerns aboutductility, anchorage, bond, transfer lengths, grouting, characteristics of high strengthprestressing steel and level of prestressing. Until recently, building codes have insistedon the ductile non-prestressed steel as the sole reinforcement and have not permittedthe use of prestressing in ductile moment frames. This paper summarizes issues,advances and historical developments of code requirements concerning theprestressed or post-tensioned frames, followed by performance of parking facilitiesduring recent major earthquakes. Next, the paper provides an overview of the currentstate of seismic design process for post-tensioned parking facilities and its structuralsystems, subsystems and elements.