Abstract
In order to achieve satisfactory global seismic behaviour of a concrete fame structure and to prevent undesirable local failures of its structural element, local strengthening of structural members by means of FRP wrap is one of the cost effective retrofitting strategy. This FRP wrapped column will increase the ductility of the element as well as the capacity that in turn will allow attaining more energy dissipating global performance. This on-going research aims to demonstrate the seismic performance of Low-to-Mid-Rise Concrete Frame retrofitted by FRP wrap in several configurations. The fragility curves of the structure before and after to local strengthening will be developed and analysed. Fragility curve will describe the probability of the structure that will exceed certain damage states given the ground shaking intensity during its service life. This curve allows evaluation for the retrofitting strategy is carried out rationally.
Highlights
In the earthquake prone region, buildings must be designed and built to resist seismic force in order to protect the inhabitants and minimize the losses
fiber reinforced polymers (FRP) confinement, where structural elements are coated with fiber sheets reinforced with polymer resins, may be implemented locally on the structural member with potential plastic hinges
Three curves show the response of the non-retrofitted structure, retrofitted with FRP on the all perimeter first story columns, and the structures retrofitted with FRP in the first story interior column which experience plastic hinges
Summary
In the earthquake prone region, buildings must be designed and built to resist seismic force in order to protect the inhabitants and minimize the losses. Retrofitting is one strategy that is often used to reduce the risk of damage / collapse of existing buildings due to earthquakes that will probably occur during the rest of their service life. In this case, retrofitting is understood as an act of rehabilitating an existing building by modifying the existing structure and / or adding a 'technical component' which was not initially there to strengthen or improve the structure's seismic performance. To improve the strength and ductility and to prevent collapse of reinforced concrete (RC) building frame element, seismic retrofitting by fiber reinforced polymers (FRP) confinement is the most common strategy. After hardening the FRP confinements will provide restraints, adding rigidity, and increase the capacity of the element to carry load which in turn will attain better global seismic behaviour of the structures [1,2,3]
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