Influence of Spatial Reinforcement Corrosion on Shear Performance of RC Beams---Based on a Numerical Investigation

钢筋混凝土（以下简称RC）结构的耐久性近年来逐渐成为国内外广泛关注的问题。其中，钢筋锈蚀是影响RC结构耐久性的重要因素之一。然而，以往大部分研究多是针对受弯性能，而对于受剪性能的关注较少。但在海洋氯化物环境下，由于箍筋相对截面较小且易受氯离子侵蚀，箍筋的锈蚀程度较纵向受拉钢筋严重，有可能发生脆性的受剪破坏先于受弯破坏的预期外现象。再者，大部分的研究多是考虑钢筋整体均匀锈蚀对结构性能的影响，但这与实际结构中混凝土内部的钢筋锈蚀多呈非均匀、非对称的空间分布不符。 数值模拟是一种非常有效的研究方法，其既可以观察到宏观力学现象，又可以收集实验无法测定的微观情报。本文在本课题组实验的基础上，使用有限元...The durability of reinforced concrete (RC) structure has become a problem being widely concerned at home and abroad in recent years. Reinforcement corrosion is an important factor affecting the durability of RC structure. Most of the publised researches on the influence of reinforcement corrosion on the structural performance of RC beams focused on flexural performance, but few of them focused on ...学位：工学硕士院系专业：建筑与土木工程学院_工程硕士(建筑与土木工程)学号：2532013115181

Influence of spatial distribution of bond deterioration insteel bar on shear performance of RC beams

为了分析钢筋黏结退化区段的空间分布对钢筋混凝土(RC)结构承载机制和破坏形态的影响,对10根模拟完全黏结失效的RC梁进行实验研究.从荷载挠度关系; 曲线、箍筋屈服举动、裂缝进展情况以及构件破坏形态出发,利用桁架和拱理论分析了纵向受拉钢筋不同区段的黏结退化及不同锚固形式箍筋的黏结退化对RC梁抗; 剪性能的影响.研究结果表明:纵向受拉钢筋的端部区域黏结失效比跨中区域黏结失效更为危险,破坏模式呈脆性,且承载能力有较大幅度的下降;端部黏结失效导; 致的上述影响在剪跨比较大梁中尤为明显;箍筋形式对梁的最终承载力影响不大,但相对于开口型箍筋,闭合型箍筋对斜裂缝开口进展有更好的限制作用.An experimental investigation was carried out for the effects of spatial; distribution of bond degradation on the shear performance andfailure; mode of reinforced concrete (RC) beams. 10 RC beams specimens were; castand three-point loading tests were carried out. The specimens were; fabricated with spatially bond degradation using artificial method. Test; results indicate that it is more dangerous for RC beams with the bond; deterioration area near the supporting position than in the vicinity of; middle portions; compared with the open-type stirrup, the closed-type; stirrup has a better restriction on the progress of inclined crack; for; specimens with different shear span to effective depth ratio, the; spatial distribution of longitudinal bar bond degradation has different; effects on the shear strength of RC beams.福建省自然科学基金资助项