Thesis
Performance of lap splices in concrete masonry shear walls
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/101425
Abstract
This research investigated the performance of reinforcement lap splices in concrete masonry shear walls detailed and loaded to represent more realistic conditions. Nine concrete masonry shear walls incorporating flexural reinforcement lap splices at the bases of the walls were constructed and subjected to in-plane cyclic loading. Additionally, nine concrete masonry panels incorporating identical lap splices were constructed and subjected to direct tension. There appear to be no significant differences in the performance of a lap splice tested in direct tension and in-plane flexure. This finding supports the validity of the large amount of data and resulting code design equation based on direct tension loading of lap splices. Results from the lap splice tests of this study confirm that reduced masonry cover significantly affects lap performance, supporting the need to address cover for lap splice design. Walls containing No. 6 (M#19) bars offset in the cells performed poorly with respect to ultimate load resistance, displacement capacity, and peak longitudinal reinforcement stresses compared to walls with similar amounts of reinforcement distributed in the center of the cells, even when provided with lap lengths of 60 bar diameters. For the parameters considered in this study, the current MSJC requirements predicted the performance of lap splices for No. 6 (M#19) bars centered and offset in the cells with reasonable accuracy. However, the provisions appear to be overly conservative for lap splices of No. 8 (M#25) bars by roughly 20%; this may be a result of confinement provided by transverse reinforcement in the walls. These results also suggest that perhaps little or no benefit was provided by the transverse reinforcement for walls containing No. 6 (M#19) bars.
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Details
- Title
- Performance of lap splices in concrete masonry shear walls
- Creators
- Jon Zachery Mjelde
- 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, Wash. :
- Identifiers
- 99900525106601842
- Language
- English
- Resource Type
- Thesis