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Title: Shaketable Testing of Rectangular Post-Tensioned Concrete Masonry Walls

Author(s): Gavin D. Wight, Jason M. Ingham, and Mervyn J. Kowalsky

Publication: Structural Journal

Volume: 103

Issue: 4

Appears on pages(s): 587-595

Keywords: concrete masonry; post-tensioned; prestressing; seismic; wall

DOI: 10.14359/16435

Date: 7/1/2006

Abstract:
The in-plane seismic response of partially grouted post-tensioned concrete masonry (PCM) walls with unbonded tendons is investigated by means of shaketable testing. The principal intent of this study was to validate use of this wall system for residential construction, before the first PCM house is built in New Zealand. An introduction and description of the testing program is followed by the presentation of results from dynamic testing of four rectangular walls, of which one contained a shrinkage control joint. Discussion of the results is concerned with wall structural response in terms of flexural strength, displacement capacity, and tendon stress. The shaketable tests demonstrated the self-centering nature of post-tensioned masonry walls and their ability to achieve large displacements with minimal accumulation of damage. The level of initial tendon prestress was found to have a significant effect on peak wall displacements.