Thesis
Effects of key parameters on the performance of concrete masonry shear walls under in-plane loading
Washington State University
Master of Science (MS), Washington State University
2011
Handle:
https://hdl.handle.net/2376/101542
Abstract
The primary objective of this research is to evaluate the effects that key design and wall parameters have on the performance of concrete masonry shear walls under in-plane loading. The parameters evaluated include aspect ratio, axial compressive stress, and amount of reinforcement. A secondary objective is to evaluate the effects that splicing of the vertical reinforcement has on wall performance. Eight, fully grouted, reinforced concrete masonry shear walls were designed in accordance with the 2008 MSJC Building Code Requirements for Masonry Structures. The walls were tested as cantilever specimens and subjected to cyclic, in-plane lateral loads under varying levels of axial load. Wall aspect ratios of 0.78, 1.0, and 2.0 were evaluated along with varying axial compressive stress ratios of 0.0, 0.0625, and 0.125 of the masonry compressive strength. Two pairs of walls evaluated the effects of lap splices in the vertical reinforcement with varying vertical reinforcement ratios. The performance of the walls was established from the test results considering predicted load capacities, wall drift, displacement ductility, plastic hinging, and energy dissipation. Increasing wall aspect ratios cause an increase in yield displacements but reduce the sliding deformations and displacement ductilities. Sliding and shear deformations are larger with lower axial compressive loads. The extent of plastic hinging is reduced by larger axial loads and by larger vertical reinforcement ratios. Larger reinforcement ratios also cause reductions in displacement ductility and an increase in the contributions from sliding and shear deformations. Drift levels at actual wall failure were significantly higher than those associated with the code-specified failure point. This indicates that larger drift capacities can be achieved at actual wall failure than is implied by the MSJC Code. Lap splices in the vertical reinforcement cause a reduction in wall performance. Further evaluations should be conducted on the effects of lap splices considering additional design and wall parameters beyond those considered in this study.
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Details
- Title
- Effects of key parameters on the performance of concrete masonry shear walls under in-plane loading
- Creators
- Jacob Dean Sherman
- Contributors
- David I. McLean (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525193901842
- Language
- English
- Resource Type
- Thesis