Old suspended timber floors flexurally-strengthened with different structural materials

Old suspended timber floors flexurally-strengthened with different structural materials, Biscaia, Hugo, Franco Noel, Nunes Ricardo, and Chastre Carlos , 15th International Conference on Fracture and Damage Mechanics, Alicante, Spain, (2016) copy at https://docentes.fct.unl.pt/cmcr/publications/old-suspended-timber-floors-flexurally-strengthened-different-structural-materia-0


The design of timber beams has strict limits when it comes to the Serviceability Limit States (SLS) either in short-term or in long-term deflections. In order to face this aspect efficiently, the increase of the cross section of the beams might be considered as a solution. However, the prohibitive increase of the costs associated to this solution or the change of the initial architecturedesign of the building, opens the opportunity to find new and more efficient solutions. In that way, the use of additional reinforcements to the timber beams may be seen as a promising solution because either new or old structures would keep always their original aesthetical aspect with no significant self-weight increase and improving their behaviour to short and long-term actions.Therefore, the current study is dedicated to the analysis of composite timber beams where Fiber Reinforcement Polymers (FRP), steel or stainless steel are used to improve the stiffness, strength and deflection behaviour of old suspended timber floors. An experimental program was conducted where old suspended timber floors reinforced with CFRP strips were subjected to 4-point bending tests. A simplify nonlinear numerical model was developed to simulate the bending behaviour of the specimens and several other cases with other reinforcement configurations and different structural materials were assumed. The numerical analysis herein presented also takes into account both Ultimate and Serviceability Limit States of the reinforced specimens.


Paper #214REFERENCES [1] T. Carvalho, C. Chastre, H.C. Biscaia and R. Paula in: 3rd fib International Congress, Washington D.C., United States of America, May 29-June 2 (2010).[2] P. Faustino and C. Chastre: Composites Part B: Engineering Vol. 74 (2015), p. 23-41.[3] H.C. Biscaia, D. Cruz and C. Chastre: Construction and Building Materials Vol. 113 (2016), p. 96-112.[4] D. Cruz Reforço de elementos estruturais de madeira com materiais compósitos de matriz polimérica (M.Sc. thesis, Nova Univ. of Lisbon, Lisbon, Portugal 2015).