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Strengthening of circular column subjected to lateral cyclic loading
Mansour, Mohamad ; prof. Ing. Alois Materna, CSc., MBA (oponent) ; Fillo,, L´udovít (oponent) ; Štěpánek, Petr (vedoucí práce)
The presented doctoral thesis deals with the strengthening of circular concrete columns by Fibre Reinforced Polymers (FRP) wraps subjected to lateral cyclic loadings. This research study focuses on examining the use of FRP for retrofitting, improving the performance of circular reinforced concrete columns and developing a design algorithm for circular column strengthening by FRP composite materials based on the analytical study, numerical simulations and the experimental results. Therefore, a design process of strengthening and confinement was presented to predict the behaviour of the concrete columns subjected to lateral cyclic loadings. Simultaneously with the axial force application, the lateral cyclic load was provided in two different ways; first, it was applied under force control test (i.e. same lateral cyclic force pulling in one direction for certain number of cycle’s 1 million cycles), second, it was applied under displacement control - reversed cyclic loading test based on a pattern of progressively increasing displacements. The dissertation also presents a literature review of research studies on the FRP confined concrete, design methodology of FRP jackets in seismic zones and code provisions of Eurocode and ACI. The experimental program was considered to verify the behaviour of confined circular column subjected to lateral cyclic loading. In the conclusions, the behaviour of a cantilever concrete column transversally confined by FRP wraps was investigated and an empirical model for FRP confined concrete subjected to high and low cyclic loadings was proposed and some information on possible future research were provided.
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Strengthening of circular column subjected to lateral cyclic loading
Mansour, Mohamad ; prof. Ing. Alois Materna, CSc., MBA (oponent) ; Fillo,, L´udovít (oponent) ; Štěpánek, Petr (vedoucí práce)
The presented doctoral thesis deals with the strengthening of circular concrete columns by Fibre Reinforced Polymers (FRP) wraps subjected to lateral cyclic loadings. This research study focuses on examining the use of FRP for retrofitting, improving the performance of circular reinforced concrete columns and developing a design algorithm for circular column strengthening by FRP composite materials based on the analytical study, numerical simulations and the experimental results. Therefore, a design process of strengthening and confinement was presented to predict the behaviour of the concrete columns subjected to lateral cyclic loadings. Simultaneously with the axial force application, the lateral cyclic load was provided in two different ways; first, it was applied under force control test (i.e. same lateral cyclic force pulling in one direction for certain number of cycle’s 1 million cycles), second, it was applied under displacement control - reversed cyclic loading test based on a pattern of progressively increasing displacements. The dissertation also presents a literature review of research studies on the FRP confined concrete, design methodology of FRP jackets in seismic zones and code provisions of Eurocode and ACI. The experimental program was considered to verify the behaviour of confined circular column subjected to lateral cyclic loading. In the conclusions, the behaviour of a cantilever concrete column transversally confined by FRP wraps was investigated and an empirical model for FRP confined concrete subjected to high and low cyclic loadings was proposed and some information on possible future research were provided.
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