Abstract:
This paper presents the results from three separate studies that support research considering the seismic response of post-tensioned concrete masonry. The first of these is a creep and shrinkage study, aimed at investigating the likely magnitude of prestress losses when using concrete masonry comprised of a lightweight pumice aggregate. The probable magnitude of shrinkage losses is reported and recommendations for appropriate creep coefficients are presented. Next, a study investigating the simulated seismic response of masonry wallettes is considered, with the objective of establishing the ultimate masonry compression strain and hence the maximum ductility capacity. Finally, aspects related to the constitutive relationship for unconfined and confined masonry are explored. The paper concludes with a brief review of how these studies each support the seismic design procedure.