Al-Jaberi, Zuhair1; Myers, John2 and ElGawady, Mohamed3

1 Ph.D. Candidate, Department of Civil, Architectural &Environmental Engineering, Missouri University of Science and Technology, 1401 North Pine Street, Rolla, MO 65409, USA, zkayc7@mst.edu
2 Professor, Department of Civil, Architectural &Environmental Engineering, Missouri University of Science and Technology, 1401 North Pine Street, Rolla, MO 65409, USA, jmyers@mst.edu
3 Associate Professor, Department of Civil, Architectural &Environmental Engineering, Missouri University of Science and Technology, 1401 North Pine Street, Rolla, MO 65409, USA, elgawadym@mst.edu

ABSTRACT

Masonry is one of the oldest and most popular construction materials in the world. Changes in the building code requirements have increased the seismic demands on existing masonry structures. This may require strengthening of masonry buildings to sustain these new requirements. Strengthening of existing masonry buildings is one of the techniques that are used for increased flexural capacity. Evaluation of seismic performance of strengthened reinforced masonry wall is of high interest. The performance of seven strengthened masonry specimens was investigated in this study. The strengthening used in this study was a fiber reinforced cementitious matrix (FRCM) system. One reinforced walls constructed in running bond and one constructed in stack bond were tested as control specimens. The other specimens were strengthened using different types of fibers in the FRCM system. The simply supported walls were tested under an out-of-plane cyclic load applied along two line loads. The behavior of the specimens is discussed with emphasis on the load deflection response, energy dissipation and stiffness degradation. The test results indicated that the behavior of the masonry walls was significantly dependent on the type of fiber used. A significant increase in the out-of-plane strength of the reinforced walls strengthened with FRCM system was observed compared to the unstrengthened reinforced wall. Different modes of failure occurred in the strengthened specimens, including a flexural failure through the concrete block, as well as fabric slippage within the matrix and debonding of FRCM fabric from the matrix attached to masonry substrate.

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