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Severely Corroded Reinforced Concrete with Cover Cracking: Part 2 Anchorage Capacity

机译:具有盖子开裂的严重腐蚀性混凝土:第2部分锚固能力

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There is a growing need for reliable methods of assessing the load-carrying capacity and remaining service life of corroded structures. In an ongoing research by the authors, issues that have not been investigated in the methods and models available today to calculate the remaining load-carrying capacity of the corroded structures are identified. Two main issues; i.e. high amount of corrosion leading to cover spalling and the effect of corroding stirrups, were investigated in an experimental program. Pull-out tests were carried out on beam-end specimens with long embedment length to study the anchorage capacity of a corroded bar. The specimens were subjected to electrochemical corrosion process leading to different corrosion penetrations prior to mechanical loading. Details concerning electrochemical corrosion setup, corrosion-induced cracking and numerical modelling of a corroding bar are presented in a companion paper subtitled "Part 1 Crack initiation, crack propagation and cover delimitation". Three types of specimens, with stirrups, without stirrups and with corroding stirrups, were subjected to pull-out test. The test results showed a significant influence of stirrups not only on corrosion-induced cracking but also on anchorage capacity and failure mode in the pull-out test. Finally, the corrosion and mechanical testing phases were simulated in a finite element model using the corrosion and bond models earlier developed by Lundgren [1,2]. The outcomes of the numerical modelling help to further understand the effect of high corrosion penetrations and presence of stirrups on failure modes observed in the experiments.
机译:越来越需要评估承载能力和腐蚀结构的剩余使用寿命的可靠方法。在作者的持续研究中,识别出在今天可用的方法和模型中进行调查的问题,以计算腐蚀结构的剩余负载承载能力。两个主要问题;即,在实验计划中研究了导致覆盖剥落和腐蚀刺激的效果的高腐蚀。在具有长嵌入长度的光束端标本上进行拉出测试,以研究腐蚀杆的锚固容量。对试样进行电化学腐蚀过程,导致机械负载前的不同腐蚀性渗透。关于电化学腐蚀设置的细节,腐蚀杆的腐蚀抗裂和腐蚀条的数值建模在伴随的纸张字幕“第1部分裂纹启动,裂纹传播和覆盖划界”中呈现。进行三种类型的样品,搅拌,没有搅拌和用腐蚀搅拌,进行拉出试验。试验结果表明,搅拌器不仅对腐蚀引起的裂缝而且对拉出试验中的锚固能力和失效模式进行了显着影响。最后,使用Lundgren早期开发的腐蚀和粘合模型在有限元模型中模拟了腐蚀和机械测试阶段[1,2]。数值建模的结果有助于进一步了解实验中观察到的高腐蚀性渗透和搅拌器的效果。

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