Behavior of Masonry Assemblies With and Without GFRP and TRM Strengthening Under Static Inplane Loading

Md, Aqhtaruddin (2014) Behavior of Masonry Assemblies With and Without GFRP and TRM Strengthening Under Static Inplane Loading. Masters thesis, Indian Institute of Technology, Hyderabad.

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Abstract

The seismic events recently occurred all over the world and, in particular, in India have shown the high vulnerability of particular classes of buildings. The damage of structural masonry elements is one of the most widespread harming injuries and cause of loss of serviceability and seismic capacity for a building. The damage suffered by these masonry elements has laid emphasis to strengthen them with appropriate reinforcing systems in order to achieve an upgrading to the necessary seismic and energy dissipation capacity. Different Strengthening techniques have been proposed and studied during, with particular on to the type of materials, system configuration with respect to the element that is to be strengthened, difficulties in the process of application and effectiveness of the reinforcement. In the last years, though different studies have been carried out in this field, many issues regarding the methods to evaluate the actual behaviour of these techniques, and their effectiveness in the improvement of seismic behaviour of the elements to which they are applied, are still open. In the present study the structural behaviour of unreinforced masonry assemblages without strengthening and with GFRP and TRM (Textile Reinforced Mortar) strengthening is studied. The assessment of the overall increase of capacity of the strengthened masonry assemblages is performed. first of all, the study is focused on the investigation of the mechanical characteristics of the strengthening system in itself. In fact, the structural behaviour of an externally applied strengthening system for masonry assemblages is examined. There are two reinforcing techniques considered in the present research, the first one is GFRP strengthening and the second one is TRM strengthening in which mortar layers incorporate a PP reinforcement in the form of grid. Both the GFRP and PP reinforcements are externally applied to the masonry assemblages. The mechanical behaviour of the parent materials such as brick, mortar is assessed and then the behaviour of assemblages under compression and shear loading is assessed through laboratory tests and constitutive laws can be proposed to characterize the reinforced mortar mechanical behaviour. The experimental characterization of the presented system is followed by and validated through numerical modelling and simulation of its mechanical behaviour.

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