Seismic performance of a post-tensioned concrete masonry wall system

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dc.contributor.advisor Dr Jason Ingham en Wight, Gavin D en 2007-02-09T02:14:58Z en 2007-02-09T02:14:58Z en 2006 en
dc.identifier.citation Thesis (PhD--Civil and Environmental Engineering)--University of Auckland, 2006. en
dc.identifier.uri en
dc.description.abstract This thesis describes the development of a post-tensioned concrete masonry (PCM) wall system designed using generic materials. PCM walls derive their lateral strength and self-centering behaviour from unbonded post-tensioning. During in-plane loading, a horizontal crack forms at the wall base, which minimises masonry tensile strains and associated wall damage. An extensive literature review identified numerous instances where PCM has been used in projects worldwide, and this is reflected in the growing presence of the technology in international masonry codes. However, the lack of knowledge associated with seismic behaviour has resulted in limited use of this material in seismic zones. Although recent studies have begun to address this through pseudo-static testing, there remained a clear need to investigate the dynamic performance of such walls. Pseudo-static testing of two partially grouted PCM walls demonstrated the suitability of this system for residential structures in seismic areas. A subsequent shake table test series investigated the response of rectangular walls, walls with openings and a shrinkage control joint. The series concluded with the testing of a simple square structure that investigated multiple openings and wall corners. Rocking was shown to be the predominant deformation component, with minimal residual displacements at the conclusion of testing. Damage was restricted to the lower wall corners and above and below openings. Equations provided in international masonry codes for estimating the tendon stress at the nominal strength limit state were shown to be inappropriate for in-plane walls. A new expression was developed based on test results and finite element modelling, and was shown to provide improved accuracy, permitting the complete monotonic response of PCM walls to be predicted with excellent accuracy. An investigation into the creep and shrinkage properties of PCM demonstrated that prestress losses can be significant and must be considered in design. A displacement based design method for post-tensioned masonry walls was developed and demonstrated using a design example. The widely used bracing design method for reinforced masonry structures was adapted for PCM walls and utilised in the design of New Zealand's first post-tensioned concrete masonry house. en
dc.format Scanned from print thesis en
dc.language.iso en en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA1629351 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights.uri en
dc.title Seismic performance of a post-tensioned concrete masonry wall system en
dc.type Thesis en Civil and Environmental Engineering en The University of Auckland en Doctoral en PhD en
dc.rights.holder Copyright: The author en
pubs.local.anzsrc 0905 - Civil Engineering en Faculty of Engineering en
dc.identifier.wikidata Q112868980

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