Behavior of CLT Formwork Beams Retrofitting with CFRP Strip under Static Loading

Timber structures are used as building elements in ancient times due to the lightness and durability. Formwork material of reinforced concrete structures are also made of wood. Although timber is widely used in industry, it has been limited research in literature. Timber formwork beams can be deformed quickly because they are used repeatedly. In this study, an experimental investigation on damaged timber formwork beams retrofitting with carbon fiber reinforced polymer (CFRP) strips and CFRP fan type anchors is performed. The experiment carried out with 2 timber formwork beam without damage and 2 timber formwork beams with damage up to 85 percent of ultimate capacity. The damaged timber beams were tested to evaluate the effectiveness of CFRP materials for flexural retrofitting. The experimental results show that the application of CFRP strip is effective for retrofitting damaged beams. As a result, it was observed that the ultimate load carrying capacity of 85% damaged beams was almost completely restored to its original performance level.