Flexural Properties of RC Beams with Net-type Continuous Fiber Reinforcement
By Kosuke Kurihara, Yukikazu Tsuji, Chun-he Li and Doyeon Kwak
Concrete Research and Technology
Vol.21, No.2, May 2010 (Issue 53)
- Synopsis:
- It is widely known that cracks occured in reinforced concrete structures are important problems when the structures are maintaned for a long period, and prediction method and control techniques of these cracks in reinforced concrete structures are neccessary to be established. Therefore, many useful methods for controlling crack widths have been proposed. Recently, net-type continuous fiber reinforcements have been developed for controlling mainly the crack widths. As for the usual continuous fiber reinforcements, they are called materials with high durability such as excellent resistance to corrosion and chemical attack, as well as with lightweight, and many application examples have been reported for ocean and salt attack environments and so on. In addition to these merits, the transportation and construction methods of the net-type continuous fiber reinforcement are very easy. Then they have been used for common structures to control crack widths, for examples as the retaining wall and the slab structures. However, the investigation studies have been hardly carried out about flexural behavior and a quantitative evaluation of the crack width when these net-type continuous fiber reinforcements are used. In this study, flexural behaviors of reinforced concrete beams with net-type continuous fiber reinforcements placed near the main reinforcing bars are reported with the focus of arrangement shape and numbers of the net-type continuous fiber reinforcements, and concrete strength. It is confirmed that the influence of the number of net-type continuous fiber reinforcements was ascertained, and the agregement of three net-type continuous fiber reinforcement can distribute the cracks and can control the flexural crack widths efficiently, because the bearing tensile force can increase in proportion to number of the continuous fiber reinforcement. In addition, it is exhibited that the flexural behaviors of reinforced concrete beams using the net-type continuous fiber reinforcement can be calculated numerically by the proposed laminated model method.
- Keywords:
- RC beam, Flexural behavior, Net-type continuous fiber reinforcement, Flexural crack width
