Experimental Investigation of Fabric Reinforced Cementitious Matrix for Seismic Strengthening of Masonry Infill Walls


Abstract eng:
Strengthening of masonry infills is essential to mitigate their brittle failure especially in the out-of-plane direction during earthquakes. Light weight composite materials such as fiber reinforced polymer (FRP) have been popularly used in different forms for seismic upgradation of masonry infilled reinforced concrete (RC) frames. However, owing to the disadvantages posed by the use of the organic binders in these composite systems, the feasibility of replacing them with inorganic matrices to enhance their overall efficiency has been evaluated in this study. An experimental program has been conducted to evaluate the bidirectional behavior of masonry infilled RC frames strengthened using glass Fabric Reinforced Cementitious Matrix (FRCM). Six half-scale masonry infilled RC frames with different FRCM configurations were tested to study the effect of method of the fabric application, provision of mechanical anchors and the orientation of fiber strands on the performance of the strengthened infill walls. Two modes of wet lay-up application which differ in the sequence of placing the fabric have been studied. A unique loading protocol was used for bidirectional loading of the specimen, consisting of successive application of slow cyclic drifts for in-plane loading and shake-table generated ground motion for out-of-plane loading. FRCM strengthening improved the strength and ductility of the masonry infills. The strengthened infill walls could safely withstand a drift in excess of 2.20%, preserving the structural integrity without jeopardizing its out-of-plane capacity. The direct mode of application of the fabric, where the fabric was applied directly on the infill wall exhibited a superior performance compared to sandwich application, where the fabric was embedded between two layers of mortar. The direct mode of application helped delay the onset of cracking in the infill walls, and showed better deformability with about 30% higher yield displacement compared to the sandwich mode. The mechanical anchors were effective in limiting the separation of the infill panel from the frame, resulting in a better bidirectional response of the infill wall. The anchored specimens showed superior post-peak behavior, due to the improved load sharing between the infill and the boundary frame which prevented the abrupt drop in the in-plane loads with the development of shear cracks at the column ends.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4204.:
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