带摩擦型自复位节点的混凝土框架结构地震响应与易损性研究

STUDY ON SEISMIC RESPONSE AND VULNERABILITY OF CONCRETE FRAMES WITH FRICTIONAL SELF-CENTERING JOINTS

  • 摘要: 自复位梁柱节点是一种新型高性能韧性构件,学者们对自复位梁柱节点构件层次的工作机理已经开展了大量的试验与理论研究,自复位框架结构体系层次的抗震能力和震后可恢复性能分析已经成为研究趋势。因此,该文提出了一种摩擦型自复位梁柱节点,构建其宏观数值分析模型,基于承载力等效原则设计了一系列不同层数的带摩擦型自复位梁柱节点的钢筋混凝土框架结构,量化了摩擦型自复位梁柱节点对钢筋混凝土框架结构的抗震性能与震后可恢复性能的影响。结果表明:罕遇地震下,自复位框架的楼面加速度和最大位移角响应均与普通框架相似,结构整体残余变形可降低86%~95%;其抗地震倒塌能力提升9%~25%;立即使用性能提高了41%~72%,且性能的提升效果随楼层的提高而增长。

     

    Abstract: The self-centering beam-column joint is an emerging high-performance resilient component. Scholars have conducted numerous experimental and theoretical studies on the working mechanism of self-centering beam-column joint components. Analysis on the seismic resistance and post-earthquake recovery performance of self-centering frames at the structural level has become a research trend. Therefore, this paper proposes a self-centering frictional beam-column joint (SCFJ) and establishes its macro numerical analysis model. Based on the principle of load-carrying capacity equivalence, a series of RC frame structures with SCFJs with different numbers of stories are designed. The influence of the SCFJs on the seismic performance and post-earthquake recovery performance of the RC frame structures is also quantified. The results show that under maximum considered earthquakes, the acceleration and maximum drift ratio responses of the self-centering frames are similar to those of ordinary frames, and the residual deformation of the structure can be reduced by 86% to 95%. Moreover, the collapse resistance is improved by 9% to 25%, and the immediate occupancy performance is improved by 41% to 72%, and the improvement effect increases with the increase of floors.

     

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