Shaketable Testing of Rectangular Post-Tensioned Concrete Masonry Walls

This article reports on a study that investigated the in-plane seismic response of partially grouted post-tensioned concrete masonry (PCM) walls with unbonded tendons, 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. The authors introduce and describe the testing program, then present their results from dynamic testing of four rectangular walls, of which one contained a shrinkage control joint. They discuss wall structural response in terms of flexural strength, displacement capacity, and tendon stress. The results of the shaketable tests showed the self-centering nature of post-tensioned masonry walls and their ability to achieve large displacements with minimal accumulation of damage. The authors conclude that the level of initial tendon prestressing has a significant effect on peak wall displacements.