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强震作用下钢筋混凝土(RC)柱如果设计不合理、抗剪措施不当或缺乏必要的抗震构造等会发生低延性的弯剪或剪切破坏,进而引发结构发生局部或整体倒塌,造成重大损失。为研究弯剪和剪切型RC构件的地震损伤机理和抗震性能,总结了RC柱的主要地震破坏模式、破坏模式判别方法以及剪切变形对柱抗震性能影响的研究进展。结果表明:RC柱的地震破坏模式主要有弯曲、剪切及弯剪型三种,其中弯剪破坏模式的界定和判别是研究的难点和重点;剪切变形对弯剪型RC柱抗震性能的影响主要体现在塑性变形阶段,但定量分析该影响的方法目前仍以经验模型为主,缺乏相对统一的力学模型。此外,已有的相关研究忽略了复杂的地震作用(即往复荷载作用历史)对柱破坏模式和损伤特性的影响,这需要在今后的研究中予以重点关注。
Under the action of strong earthquakes, if the RC columns are not properly designed, the shearing or shearing failure with low ductility will occur if there is improper shearing measures or the lack of necessary earthquake-resistant structures, which will lead to partial or complete collapse of the structure and serious loss . In order to study the earthquake damage mechanism and seismic performance of RC shear members and shear RC members, the research progress of the main seismic failure modes, the identification methods of failure modes and the influence of shear deformation on the seismic behavior of RC columns are summarized. The results show that the main failure modes of RC columns include bending, shearing and bending and shearing types. The definition and discrimination of shear failure modes are the key points and points of study. The shear deformation of shears and shear RC columns The influence is mainly reflected in the stage of plastic deformation, but the quantitative analysis of the impact of the method is still based on empirical models, the lack of a relatively uniform mechanical model. In addition, the related researches omit the influence of complicated seismic action (history of reciprocating load) on the failure modes and damage characteristics of columns, which needs to be paid more attention in the future research.