Partially-grouted reinforced masonry is a common form of construction in institutional, government, and commercial buildings throughout the eastern, southern, and central United States. It is important for this lateral-load resisting system to remain intact during a seismic event, as many of these of buildings require quick accessibility after an earthquake for community resilience. Previous experimental work has shown partially-grouted masonry shear walls (PGMSW) to underperform under lateral loading relative to code expectations for fully-grouted masonry shear walls. The non-conservative nature of the design of these walls presents a need for retrofit and repair methods should a large seismic event occur where these buildings exist. Numerous experimental studies have focused on fiber-reinforced polymer (FRP) retrofit of unreinforced masonry structures through the use of carbon or fiberglass bars, sheets, strips and meshes. While these experiments show the overall benefit of FRP retrofits for unreinforced masonry walls, issues with delamination and under-utilization of the FRP materials has been reported. Additionally, there exists a gap in the literature for the retrofit of reinforced and partially-grouted masonry using FRP materials other than the commonly used carbon and glass. To address these issues, as well as to better understand the behavior of repaired PGMSWs, an experimental repair investigation was completed at the University of Minnesota. The study focused on a PGMSW sub-assemblage (shear wall with cross-walls and window opening) that was heavily damaged, intentionally, during initial testing. The sub-assemblage was subsequently repaired using a cementitious overlay reinforced with basalt miniature reinforcing bars (i.e. Minibars). The design, construction, and data from cyclic testing of these specimens are used to evaluate the feasibility of the basalt-reinforced cementitious overlay as a repair method for PGMSW.
|Original language||English (US)|
|Title of host publication||11th National Conference on Earthquake Engineering 2018, NCEE 2018|
|Subtitle of host publication||Integrating Science, Engineering, and Policy|
|Publisher||Earthquake Engineering Research Institute|
|Number of pages||11|
|State||Published - 2018|
|Event||11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018 - Los Angeles, United States|
Duration: Jun 25 2018 → Jun 29 2018
|Name||11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy|
|Conference||11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018|
|Period||6/25/18 → 6/29/18|
Bibliographical noteFunding Information:
The authors gratefully acknowledge the financial support of the U.S. National Science Foundation NEES Program (Award CMMI-1208208) and the Graduate School of the University of Minnesota, as well as the National Concrete Masonry Association for additional funding. The authors also thank Anchor Block for the donation of the concrete blocks, TCC Materials for providing the mortar and grout at cost, Vanberg Specialized Coatings for providing the Con-Korite at a reduced cost, Harris Rebar for donating the rebar, ReforceTech for donating the basalt Minibars, and Advanced Shoring for donating the use of the formwork. Finally, the authors thank the Cement Mason’s Local 633 Apprentices, the Bricklayers & Allied Craftworkers Local Union 1, and the International Masonry Institute for their assistance with construction.
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