Behaviour of RC beams corroded under sustained service loads
Behaviour of RC beams corroded under sustained service loads
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DOI：
10.1016/j.conbuildmat.2009.06.005
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发表时间：
2009-11
影响因子：
7.4
通讯作者：
G. Malumbela;P. Moyo;M. Alexander
中科院分区：
文献类型：
--
作者：
G. Malumbela;P. Moyo;M. Alexander
本文提出了一项实验研究的结果，以表征钢筋混凝土梁腐蚀的结构行为，同时受到持续的服务载荷。采用5% NaCl溶液和恒定外加电流对拉伸钢筋进行加速腐蚀。试验了4根RC梁，每根梁宽153mm，深254mm，长3000mm。梁在相当于极限荷载的1%、8%和12%的荷载下进行测试。在腐蚀过程中监测纵向拉伸和压缩应变，并以此确定中性轴深度、曲率和梁的面积二阶矩随电解时间的变化。结果表明，梁的纵向应变、中性轴深度和曲率与腐蚀程度和使用荷载有关，而面积二阶矩主要受腐蚀程度的影响。
This paper presents the results of an experimental study conducted to characterize the structural behaviour of reinforced concrete beams corroded whilst subjected to constant sustained service loads. Corrosion of tensile steel bars was induced by an accelerated corrosion process using a 5% solution of NaCl and a constant impressed current. Four RC beams were tested, each with a width of 153mm, a depth of 254mm and a length of 3000mm. Beams were tested whilst under a load equivalent to 1%, 8% and 12% of the ultimate load. Longitudinal tensile and compressive strains were monitored during the corrosion process and used to determine the variation of the depth of the neutral axis, the curvature and the second moment of area of beams with the time of electrolysis. The results indicate that the longitudinal strains, the depth of the neutral axis and the curvature of beams depend on both the level of corrosion and the applied service load whilst the second moment of area is mostly influenced by the level of corrosion.