负载下CFRP 与钢板复合加固钢筋混凝土梁抗弯试验及设计理论.pdf

41 3 () Vol.41 No.3 2010 6 Journal of Central South University (Science and Technology) Jun. 2010 CFRP 1, 21 (1. 200092 2. 200092) (CFRP) 4 CFRP 3 1 CFRP TU375.1 A 1672−7207(2010)03−1165−07 Flexural behavior and design theories of CFRP-steel plates composite strengthened reinforced concrete beams at different preloaded levels XIONG Xue-yu1, 2, FAN Xin-hai1 (1. Department of Building Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai 200092, China) Abstract: Flexural behavior of the CFRP-steel plate composite strengthened beams and the effects of different preloaded levels on flexural behavior were investigated. Four reinforced concrete beams including three CFRP-steel plate composite strengthened beams and one control beam were tested, and the theoretical analysis was conducted to explain the experimental phenomena and test results. Finally, the calculation formulas of ultimate flexural load-carrying capacity, deflections and crack width of the composite strengthened concrete beams were presented. Both the experimental and analytical results indicate that the flexural capacity and stiffness of all the composite strengthened beams are enhanced evidently as compare