Nonlinear stress-strain behaviour of corrosion-damaged reinforcing bars including inelastic buckling
Nonlinear stress-strain behaviour of corrosion-damaged reinforcing bars including inelastic buckling
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DOI：
10.1016/j.engstruct.2012.09.034
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发表时间：
2013-03-01
影响因子：
5.5
通讯作者：
Alexander, Nicholas A.
中科院分区：
文献类型：
--
作者：
Kashani, Mohammad M.;Crewe, Adam J.;Alexander, Nicholas A.
在地震区钢筋混凝土结构的抗震设计和评估中，纵筋塑性铰区的屈曲是一个需要考虑的重要极限状态。如果结构位于环境侵蚀区域，则其在使用寿命期间也会受到材料劣化的影响。钢筋锈蚀是钢筋混凝土结构和桥梁最常见的劣化类型。本文通过大量的试验研究了锈蚀钢筋的非线性应力-应变特性。不同的腐蚀水平的拉压性能的不同长细比的酒吧的影响。本研究的结果表明，腐蚀水平超过15%的质量损失显着影响钢筋的拉伸和腐蚀的屈曲破坏机制的钢筋在压缩的变化的延性和塑性变形。失稳试验结果表明，锈蚀钢筋质量损失10%时，其失稳承载力下降约20%。腐蚀坑沿着方向的分布是影响钢筋拉压应力应变响应的最重要的参数。此外，本构材料模型预测屈服后屈曲行为的高强度钢没有屈服平台。所提出的分析模型是基于Dhakal-Maekawa屈曲模型。对未锈蚀和锈蚀钢筋的实验测试验证了分析模型。腐蚀扩展屈曲模型的计算结果与试验结果吻合较好。(C)2012爱思唯尔有限公司保留所有权利。
In the seismic design and assessment of reinforced concrete structures in earthquake zones buckling of longitudinal reinforcement in plastic hinge regions is an important limit state that needs to be considered. If the structure is located in an environmentally aggressive area, it is also subject to material deterioration over its service life. Corrosion of reinforcement is the most common type of deterioration of reinforced concrete (RC) structures and bridges. In this paper the nonlinear stress-strain behaviour of corroded reinforcing bars has been investigated by extensive experimental testing. The effect of different corrosion levels on the tension and compression behaviour of bars with different slenderness ratios is presented. The results of this study show that a corrosion level above 15% mass loss significantly affects the ductility and plastic deformation of reinforcement in tension and that corrosion changes the buckling collapse mechanism of the bars in compression. The results of buckling tests show that 10% mass loss produces about a 20% reduction in the buckling capacity of corroded bars. The results also show that the distribution of corrosion pits along the length of corroded bars is the most important parameter affecting the stress-strain response in both tension and compression. Furthermore, a constitutive material model to predict the post-yield buckling behaviour of high-strength steel without a yield plateau is also developed. The proposed analytical model is based on Dhakal-Maekawa buckling model. The analytical model has been validated against experimental tests on uncorroded and corroded bars. The results of this corrosion extended buckling model show a good agreement with the physical testing. (C) 2012 Elsevier Ltd. All rights reserved.