The corrosion of steel reinforcement is commonly believed to be the primary cause of structural deterioration of reinforced concrete (RC) structures; as a result of this deterioration, a RC structure can incur a considerable reduction in structural serviceability and safety. Because of their inherent redundancy, statically indeterminate structures develop resistant mechanisms that can potentially assist in delaying the collapse of severely damaged RC structures. In order to experimentally demonstrate these resistant mechanisms, four groups of three two-span continuous RC beam members each were deteriorated using induced corrosion methods and tested to failure under monotonic loads. For control, one group of three RC beams was left uncorroded and similarly load tested. All the RC beam specimens subjected to corrosion demonstrated a significant reduction (a maximum reduction of 55% as compared to the uncorroded control group) of their ultimate capacity. The presence of corrosion induced a transition from flexural failure to anchorage failure in some specimens; despite the induced damage some redistributed structural capacity was observed. Modelling of deterioration effects by the inclusion of different aspects of corrosion was also conducted. Three-dimensional (3D) Finite-Element Method (FEM) models were developed to assess the variation in the mechanical properties of the corroded steel and the reduction in the bond interaction between concrete and steel due to the corrosion of the steel reinforcement. In general, the current 3D FEM models demonstrated a good agreement with the experimental data; however, 3D FEM models that exhibit greater sophistication are necessary to better describe the failure mode of some RC beam specimens when they are associated with local effects.

中文翻译：

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锈蚀静不定钢筋混凝土构件的极限承载力

钢筋锈蚀通常被认为是钢筋混凝土（RC）结构退化的主要原因；由于这种劣化，RC 结构会导致结构适用性和安全性的显着降低。由于其固有的冗余性，静态不确定的结构会产生抵抗机制，可能有助于延迟严重损坏的 RC 结构的倒塌。为了通过实验证明这些抵抗机制，四组三个两跨连续 RC 梁构件每组都使用诱导腐蚀方法恶化，并在单调载荷下测试失效。为了控制，一组三个 RC 梁保持未腐蚀并进行类似的负载测试。所有经受腐蚀的 RC 梁试样都表现出其极限承载力的显着降低（与未腐蚀的对照组相比，最大降低了 55%）。腐蚀的存在导致了一些试样从弯曲破坏到锚固破坏的转变；尽管引起了损坏，但观察到了一些重新分布的结构能力。还对腐蚀的不同方面进行了劣化效应建模。开发了三维 (3D) 有限元法 (FEM) 模型，以评估受腐蚀钢材机械性能的变化以及由于钢筋腐蚀导致混凝土与钢材之间的粘结相互作用的减少。总体而言，当前的 3D FEM 模型与实验数据表现出良好的一致性；然而，