<p>The masonry construction industry represents a historically significant and substantial portion of both existing and new residential, commercial and institutional low- to medium-rise structures across Canada. Although commonly chosen for its aesthetic qualities by architects, structural masonry walls constructed with concrete block units are also an effective lateral force (wind or seismic) resisting system. The purpose of this dissertation is to address what are perceived to be overly conservative and outdated practices within masonry construction and design by adopting analysis and design practices which have had success with similar reinforced concrete wall systems. The results from a test program reporting on the behavior of nine fully-grouted reinforced masonry (RM) structural walls containing confined boundary elements are analyzed and presented according to force-, displacement- and performance-based seismic design considerations. The boundary element containing four vertical bars with lateral confinement stirrups selected represents a readily codified and practically achievable means of achieving seismic performance enhancement. The design and detailing of the specimens represented a range of parameters that would be anticipated to vary within low- to medium-rise RM buildings. In addition, an analytical study is carried out to derive, from first principles of stress equilibrium and strain compatibility, the necessary constitutive material and mechanics-based equations needed to solve for the state of shear stress and strain in an idealized cracked masonry macro-element. The algorithm proposed is validated by comparing the proposed model to existing test data and is further developed towards predicting the design shear strength of RM structural walls. The results from these experimental and analytical research programs are subsequently used to provide a set of proposed code clauses at the end of the thesis. Prescriptive design requirements are proposed for a new category of <em>Special Ductile Masonry Shear Wall</em> containing boundary elements including integration of a new shear strength expression. These clauses have been written with the intention of adoption within the CSA S304.1 and the MSJC North American masonry designs standards.</p> / Doctor of Philosophy (PhD)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/12883 |
| Date | 04 1900 |
| Creators | Banting, Bennett |
| Contributors | El-Dakhakhni, Wael, Civil Engineering |
| Source Sets | McMaster University |
| Detected Language | English |
| Type | thesis |
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