科研之友
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摘要
In practice of structural strengthening, the technique of externally bonding fiber-reinforced polymer (FRP) has been extensively employed. In order to make full use of the tensile strength of FRP and/or improve the stiffness under service load or crack-resistant capacity of a reinforced concrete (RC) bending member, FRP can be pre-tensioned before it is bonded to the member. Based on the experimental observation, various types of failure are studied for reinforced concrete members strengthened by externally bonding pre-tensioned FRP. Formula are presented to calculate the effective pre-stress, the bending moment at which the pre-compressive stress vanishes at extreme fiber of the critical section and the moment at cracking for the strengthened member. All possible strain combinations at ultimate limit state of flexure are analyzed for the FRP-RC composite section. Expressions are proposed to distinguish between two modes of flexural failure respectively due to fracture of FRP and crushing of concrete. A set of equations are suggested for prediction of the corresponding ultimate strength, and meanwhile the applicability of the proposed formula is validated by the good agreement of the analytical results with the measured values. In addition, the method and formula put forward can serve as references for design of strengthening by near-surface mounting (NSM) pre-tensioned FRP.
- 出版日期2006
- 单位中南大学
