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采用自主设计的混凝土梁反力加载试验装置,对不同负载条件下锈蚀钢筋混凝土梁的抗力性能进行研究。在试验梁跨中设置保水槽并盛装3%的Na Cl溶液模拟海洋环境,采用恒电流加速锈蚀钢筋,试验工况分为不负载锈蚀、连续负载锈蚀、负载锈蚀卸载、负载不锈蚀及完好梁等5种,其中负载水平又按梁极限承载力的25%、45%和65%分为3种。研究表明:相同条件下,持荷状态对梁内钢筋的平均锈蚀率影响不明显,但负载水平对钢筋的锈蚀形态具有重要影响,随着负载水平的增加,钢筋的不均匀锈蚀程度渐趋显著;相同条件下,持续负载与否对锈蚀梁的承载力具有影响,较未负载锈蚀梁而言,负载锈蚀梁卸载后重新加载至破坏时两者极限承载力相近,但负载锈蚀不卸载梁的承载力更高;现有锈蚀梁正截面承载力计算模型具有一定的可靠性,然而尚不能充分揭示其退化机理。
The self-designed concrete beam reaction load test device was used to study the resistance performance of corroded RC beams under different loading conditions. In the test beam span to set the water tank and containing 3% NaCl solution to simulate the marine environment, the use of galvanostatic corrosion of reinforced steel, the test conditions are divided into no load corrosion, continuous load corrosion, load unloading rust, stainless steel load and intact beam And other five kinds, of which the load level and beam ultimate bearing capacity of 25%, 45% and 65% divided into three kinds. The results show that under the same conditions, the load state has no significant effect on the average corrosion rate of steel bar, but the load level has an important influence on the corrosion morphology of steel bar. With the increase of load level, the uneven corrosion degree of steel bar becomes more significant ; Under the same conditions, the sustained load or not have an impact on the bearing capacity of the corroded beam. Compared with the unloaded corroded beams, the ultimate bearing capacity of the corroded beams loaded with corroded beams is similar to that of the corroded beams Higher; the calculation model of the bearing capacity of the normal corroded beams has a certain reliability, however, the mechanism of degradation can not be fully revealed yet.