New Frp Rehabilitation Technique For Historic Masonry Buildings

Summary

An innovative fibre-reinforced polymer structural rehabilitation technique for historic masonry buildings is described.  A large portion of the stock of existing older buildings in the world is constructed using unreinforced masonry walls (URM).  Many of these buildings are of historic significance.  Although URM buildings perform well under service gravity loads and low lateral loads, past and recent evidence of damage or collapse during earthquakes shows that they are vulnerable to the effects of inertia forces generated by earthquakes.  Two types of failure are commonly observed for URM walls: in-plane failure characterised by a diagonal tensile crack pattern, and out-of-plane failure where cracks are mainly along the mortar bed joints.  The out-of-plane excitement and failure of URM facades has been identified as the most significant hazard in a seismic event.  New and modified techniques are required to economically enhance performance yet preserve the appearance of such buildings.  The new strengthening technique utilises epoxy impregnated carbon fibre rope mounted near the surface of the masonry walls, where reinforcement is most effective.  Test results confirmed the  high efficiency of the proposed technique.  Significant increases in cracking and ultimate capacities, deformability, and energy absorption were achieved for all reinforcing schemes compared to the original unreinforced state.  8 refs.

Primary author(s): Korany Y S; Drysdale R G

                            McMaster University

Source: Masonry (9). Proc.6th Int.Masonry Conf.

            London,4-6 November 2002,p.246-252

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