钢筋混凝土梁的抗弯性能实验研究

Experimental Research on Bending Resistance of Reinforced Concrete Beams

基于舟山海港码头的锈蚀钢筋混凝土梁的足尺实验研究,对于海洋环境侵蚀引起钢筋锈蚀而导致的钢筋混凝土梁的耐久性失效情况进行了全面的研究,包括混凝土和钢筋材料性能的变化、抗弯承载能力的变化。基于材料性能的变化,利用有限元3D模型进行对照;分析了锈蚀钢筋混凝土梁在加载实验后的破坏过程和破坏形式,结合电化学加速的实验研究结果,研究了锈蚀钢筋混凝土梁的抗弯破坏机理和混凝土与钢筋的粘结应力,为钢筋混凝土结构的耐久性设计提供了依据。

Based on the full-scale experimental research on the corroded reinforced concrete （R.C.） beams of Zhoushan Seaport Wharf, this paper conducts an in-depth research on the loss of durability of R.C. beams due to reinforcing bars in marine environment, including change of performance of concrete and reinforced bars. Based on the test result of the materials＇ performance, a 3-D FE model is established to simulate the real beams under load. Three beams are loaded to ultimate failure and the test results are analyzed. According to the comparison of the computing result and full-scale test result, and combining the result of electronically accelerated test, the mechanism of fracture of corroded reinforced concrete beam and the bond stress between the reinforcing bar and concrete are studied. The results may serve as a basis for durability design of R.C. structures.