The analysis of continuous Reinforced Concrete (RC) beams strengthened by externally bonded FRP (Fiber Reinforced Polymers) sheets is still an interesting research field requiring further investigations. Some recent studies carried out on this topic proved the possibility to achieve a certain degree of stresses redistribution by using a proper design approach for strengthening, namely the appropriate choice of the FRP reinforcement configuration as well as an appropriate reinforcement anchorage, aiming to eliminate or at least delay the occurrence of premature failures. In the present paper the structural behavior of RC continuous beams externally strengthened by FRP laminates is investigated from both an experimental and a theoretical point of view. In particular, the analysis of moment redistribution is addressed; the main items being related to the influence of the strengthening configuration and the evaluation of moment redistribution not only at the ultimate but throughout the whole loading process. At this aim tests on six FRP strengthened RC continuous beams subjected to a single point load at each span has been performed and obtained results discussed. In addition a theoretical non linear model is proposed, taking into account bond characteristics and concrete cracking, to get a deeper understanding of the structural behavior both at ultimate and service conditions. The good agreement between theoretical predictions and experimental results evidences the effectiveness of the proposed model and its possible use for assessing design relationships.
Moment Redistribution in Continuous Fiber-Reinforced Polymer-Strengthened Reinforced Concrete Beams
AIELLO, Maria Antonietta;
2011-01-01
Abstract
The analysis of continuous Reinforced Concrete (RC) beams strengthened by externally bonded FRP (Fiber Reinforced Polymers) sheets is still an interesting research field requiring further investigations. Some recent studies carried out on this topic proved the possibility to achieve a certain degree of stresses redistribution by using a proper design approach for strengthening, namely the appropriate choice of the FRP reinforcement configuration as well as an appropriate reinforcement anchorage, aiming to eliminate or at least delay the occurrence of premature failures. In the present paper the structural behavior of RC continuous beams externally strengthened by FRP laminates is investigated from both an experimental and a theoretical point of view. In particular, the analysis of moment redistribution is addressed; the main items being related to the influence of the strengthening configuration and the evaluation of moment redistribution not only at the ultimate but throughout the whole loading process. At this aim tests on six FRP strengthened RC continuous beams subjected to a single point load at each span has been performed and obtained results discussed. In addition a theoretical non linear model is proposed, taking into account bond characteristics and concrete cracking, to get a deeper understanding of the structural behavior both at ultimate and service conditions. The good agreement between theoretical predictions and experimental results evidences the effectiveness of the proposed model and its possible use for assessing design relationships.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
