FRP Strengthened RC Beams Subjected to Drop Weight Impact and Static Load - Experimental study for structural response

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Examensarbete för masterexamen
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2020
Författare
NORDSTRÖM, GABRIELLA
ZELEKE NIGANI, YEABKAL
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ABSTRACT Using Fibre Reinforced Polymer (FRP) to repair and strengthen concrete structures have been a widely used method recently. Therefore, the aim of this master’s thesis is to increase the understanding of the structural response of FRP strengthened Reinforced Concrete (RC) beams subjected to impact loading by studying the response of deformation capacity and the energy absorption under impact loading. The remaining residual capacity is also of interest in this study which is established by static loading of impacted beams until failure by rupture of reinforcement. Drop weight impact for different drop heights were carried out on different amount of FRP strengthened RC beams in order to give a good overview of the intensity of the impact loading and the influence of strengthening area. The response of the beams for the drop weight tests were captured by high speed cameras and the recorded footages were analysed by using Digital Image Correlation (DIC). Literature study was done to give background information and to estimate the structural response of structures under impact and static loading. Comparison between the behaviour of different strengthening types as well as comparison between experimental results and prediction calculations are also included in this thesis work. It is observed that FRP strengthening resulted in increased load capacity and maximum deformation for static loading. Rotation capacity slightly increased in 1 layer FRP strengthening and slightly decreased in 3 layers FRP strengthening. Internal work was also observed to be increased in FRP strengthend beams. FRP strenghthening over all indicated positive effect for impact tests. The residual capacity of FRP strengthened beams also exihibited improvement significantly.
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Ämne/nyckelord
reinforced concrete (RC), fibre reinforced polymer (FRP), aramid fibre, trengthening, impact load, drop weight impact, digital image correlation (DIC), load capacity, plastic deformation, internal work, static loading
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