Title:
Behavior of a Unbonded Post-Tensioned, Precast Concrete T-Wall under Lateral Loading
Author(s):
Sharma
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
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DOI:
Date:
10/23/2022
Abstract:
Precast rocking shear walls with unbonded post-tensioning provide a low damage alternative to traditional monolithic reinforced concrete shear walls. However, laboratory testing of precast rocking shear walls has been limited to rectangular cross-section, despite the widespread use of nonrectangular shear in elevator cores or around hallways. This experimental study supported by National Science Foundation (NSF) aims to address this knowledge gap by conducting laboratory testing of a Tshaped precast rocking shear wall. The T-wall specimen was constructed at 1/3rd scale of a prototype wall and tested under multi-directional loading up to 1.50% drift. The T-wall specimen was 5 in. thick, 5 ft. and 6 ft. wide in flange and web direction respectively, with a loading height of 136.75 in. Observations during testing indicate that damage in the wall panel is limited to rocking corners, similar to rectangular rocking walls. The measured residual drift was less than 0.25% and the measured energy dissipation ratio exceeded the required value of 12.5%. The analysis of the measured force-displacement response indicated that the behavior of the wall specimen in the flange direction was different than that of an equivalent rectangular rocking wall. This test's unique experimental data is expected to aid in the design of non-rectangular precast rocking shear walls. Additional experimental and analytical research is required to develop uniform design guidelines for non-rectangular precast rocking shear walls. This presentation will provide a summary of experimental test results and observations.