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Strength and ductility of high-strength concrete shear walls under reversed cyclic loadingDabbagh, Hooshang, Civil & Environmental Engineering, Faculty of Engineering, UNSW January 2005 (has links)
This study concerns the strength and behaviour of low-rise shear walls made from high-strength concrete under reversed cyclic loading. The response of such walls is often strongly governed by the shear effects leading to the shear induced or brittle failure. The brittle nature of high-strength concrete poses further difficulties in obtaining ductile response from shear walls. An experimental program consisting of six high-strength concrete shear walls was carried out. Specimens were tested under inplane axial load and reversed cyclic displacements with the test parameters investigated being longitudinal reinforcement ratio, transverse reinforcement ratio and axial load. Lateral loads, lateral displacements and the strains of reinforcement in edge elements and web wall were measured. The test results showed the presence of axial load has a significant effect on the strength and ductility of the shear walls. The axially loaded wall specimens exhibited a brittle behaviour regardless of reinforcement ratio whereas the specimen with no axial load had a lower strength but higher ductility. It was also found that an increase in the longitudinal reinforcement ratio gave an increase in the failure load while an increase in the transverse reinforcement ratio had no significant effect on the strength but influenced the failure mode. A non-linear finite element program based on the crack membrane model and using smeared-fixed crack approach was developed with a new aggregate interlock model incorporated into the finite element procedure. The finite element model was corroborated by experimental results of shear panels and walls. The finite element analysis of shear wall specimens indicated that while strengths can be predicted reasonably, the stiffness of edge elements has a significant effect on the deformational results for two-dimensional analyses. Therefore, to capture the deformation of walls accurately, three-dimensional finite element analyses are required. The shear wall design provisions given in the current Australian Standard and the Building Code of American Concrete Institute were compared with the experimental results. The comparison showed that the calculated strengths based on the codes are considerably conservative, specially when there exists the axial load.
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Strength and ductility of high-strength concrete shear walls under reversed cyclic loadingDabbagh, Hooshang, Civil & Environmental Engineering, Faculty of Engineering, UNSW January 2005 (has links)
This study concerns the strength and behaviour of low-rise shear walls made from high-strength concrete under reversed cyclic loading. The response of such walls is often strongly governed by the shear effects leading to the shear induced or brittle failure. The brittle nature of high-strength concrete poses further difficulties in obtaining ductile response from shear walls. An experimental program consisting of six high-strength concrete shear walls was carried out. Specimens were tested under inplane axial load and reversed cyclic displacements with the test parameters investigated being longitudinal reinforcement ratio, transverse reinforcement ratio and axial load. Lateral loads, lateral displacements and the strains of reinforcement in edge elements and web wall were measured. The test results showed the presence of axial load has a significant effect on the strength and ductility of the shear walls. The axially loaded wall specimens exhibited a brittle behaviour regardless of reinforcement ratio whereas the specimen with no axial load had a lower strength but higher ductility. It was also found that an increase in the longitudinal reinforcement ratio gave an increase in the failure load while an increase in the transverse reinforcement ratio had no significant effect on the strength but influenced the failure mode. A non-linear finite element program based on the crack membrane model and using smeared-fixed crack approach was developed with a new aggregate interlock model incorporated into the finite element procedure. The finite element model was corroborated by experimental results of shear panels and walls. The finite element analysis of shear wall specimens indicated that while strengths can be predicted reasonably, the stiffness of edge elements has a significant effect on the deformational results for two-dimensional analyses. Therefore, to capture the deformation of walls accurately, three-dimensional finite element analyses are required. The shear wall design provisions given in the current Australian Standard and the Building Code of American Concrete Institute were compared with the experimental results. The comparison showed that the calculated strengths based on the codes are considerably conservative, specially when there exists the axial load.
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The relation between surface and basal velocity variations in glacier, with application to the mini-surges of variegated glacier /Balise, Michael John. January 1988 (has links)
Thesis (Ph. D.)--University of Washington, 1988. / Vita. Bibliography: leaves [182]-187.
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Effect of shear-induced breakup and restructuring on the size and structure of aggregates /Marsh, Peter. January 2005 (has links)
Thesis (Ph. D.)--University of New South Wales, 2005. / Also available online.
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Investigation of tropospheric turbulence using the Adelaide VHF radar /Mu, K. L. January 1991 (has links) (PDF)
Thesis (M. Sc.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1992. / Includes bibliographical references (leaves 119-127).
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Investigation of spatially graded distribution of pore fluid effect on wetting-induced soil collapse /Xu, Jia. January 2008 (has links)
Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (leaves 134-138). Also available in electronic version.
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A unified elasto-plastic model for saturated loosely compacted completely decomposed graniteTo, Chiu-yin. January 2008 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2008. / Includes bibliographical references. Also available in print.
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A numerical study of the stability of a stratified mixing layerCollins, David A. January 1982 (has links)
Thesis (Ph.D.) -- McGill University. / Written for the Dept. of Mathematics. Typescript. Bibliography: leaves 48-50.
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Stressed liquid crystals properties and applications /Zhang, Guoqiang. January 2007 (has links)
Thesis (Ph.D.)--Kent State University, 2007. / Title from PDF t.p. (viewed Mar. 4, 2009). Advisor: John West. Keywords: liquid crystal, polymer, shear, structure, application Includes bibliographical references (p. 252-267).
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The undrained behavior of saturated, dilitant silts /Rose, Andrew Thomas, January 1994 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Also available via the Internet.
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