Enhancement of seismic performance of partially grouted reinforced masonry shear walls

Mohammad Bolhassani, Ahmad A. Hamid, Franklin L. Moon

Research output: Contribution to conferencePaperpeer-review

5 Scopus citations

Abstract

Almost all low-rise reinforced concrete masonry buildings constructed outside the West Coast are partially grouted. Past research on partially grouted masonry shear walls have shown that current Masonry Standard Joint Committee (MSJC 2011) code's provisions overestimate the shear capacity of this type of shear walls. NSF has awarded Drexel University, University of Minnesota and University of California-San Diego a grant to study seismic performance and design of partially-grouted reinforced masonry buildings. This project will result in economically competitive design details and retrofit methods to enhance the seismic performance and safety of this system. The outcome of the experimental and analytical investigations will be instrumental in improving code's design provisions for new construction and in seismic retrofitting of deficient existing buildings. This paper presents results of shear wall tests conducted at Drexel University to investigate the effect of reinforcement detail (single versus adjacent double reinforcing cells with same amount of steel) on seismic response of cantilever shear walls. Two full-scale walls (12′-6″ by 12′-6″) with single reinforcement (wall SR) and double reinforcement (wall DR) were subjected to in-plane quasi static reversed cyclic horizontal displacements at the top. A similar wall to DR was built with joint reinforcement to investigate its contribution to the shear capacity of the walls. Axial stress of 20 psi was applied using two vertical actuators. Wall SR behavior was a shear-dominated behavior whereas wall DR had a flexural-dominated behavior. Double reinforcing detail resulted in 34 percent increase in shear capacity and 47 percent increase in deformation capacity (top drift) compared to the single reinforced wall. It is, therefore, concluded that the proposed reinforcement detail has a significant contribution in enhancing the seismic performance of partially grouted concrete masonry shear walls. Test results also indicated that joint reinforcement did not improve the seismic performance of partially grouted reinforced (double cells reinforcing) shear walls.

Original languageEnglish (US)
DOIs
StatePublished - Jan 1 2014
Externally publishedYes
Event10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014 - Anchorage, United States
Duration: Jul 21 2014Jul 25 2014

Other

Other10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014
CountryUnited States
CityAnchorage
Period7/21/147/25/14

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

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