An innovative scheme for retrofitting masonry-infilled non-ductile reinforced concrete frames

An innovative retrofit scheme is proposed for masonry-infilled non-ductile reinforced concrete frames to remedy the brittle shear failure caused by the huge strut force exerted by the un-reinforced masonry (URM) panel on the columns following corner crushing of the panel. The URM panel is separated from the columns, and steel brackets are provided to transfer the strut forces from the panel to the beam, thereby totally eliminating transfer of large strut force to the columns. This scheme has a beneficial effect of increasing the shear capacity of the beam due to the large compression induced in it to resist theshear component caused by the strut force. Cyclic load test on a 3/4 scale specimen of a single-bay, single-story frame assembly retrofitted with the proposed scheme has revealed much enhanced performance over the un-retrofitted one, with the drift capacity increased five folds while retaining most of the strength and stiffness.

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