卢啸, 徐航, 张雪敏. 摩擦型自复位梁柱节点的滞回与损伤性能研究[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2023.03.0197
引用本文: 卢啸, 徐航, 张雪敏. 摩擦型自复位梁柱节点的滞回与损伤性能研究[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2023.03.0197
LU Xiao, XU Hang, ZHANG Xue-min. STUDY ON HYSTERESIS AND DAMAGE PERFORMANCE OF SELF-CENTERING FRICTIONAL BEAM-COLUMN JOINT[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2023.03.0197
Citation: LU Xiao, XU Hang, ZHANG Xue-min. STUDY ON HYSTERESIS AND DAMAGE PERFORMANCE OF SELF-CENTERING FRICTIONAL BEAM-COLUMN JOINT[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2023.03.0197

摩擦型自复位梁柱节点的滞回与损伤性能研究

STUDY ON HYSTERESIS AND DAMAGE PERFORMANCE OF SELF-CENTERING FRICTIONAL BEAM-COLUMN JOINT

  • 摘要: 为减小传统钢筋混凝土节点(reinforced concrete joint, RCJ)的残余变形和塑性损伤,便于震后快速修复,提出了一种新型的摩擦型自复位现浇梁柱节点(self-centering frictional cast-in-situ beam-column joint, SCFJ),通过在梁端两个削弱区域增设兼具自复位能力和耗能能力的摩擦型自复位连接件(friction self-centering connectors, FC),从而减小结构的残余变形,同时将损伤集中在削弱梁段。该文对一SCFJ 试件和一RCJ 试件进行了低周往复加载试验,对两者的滞回性能、复位能力、耗能能力、损伤演化进行对比分析。并建立了SCFJ的精细有限元模型,对其滞回性能进行模拟。研究结果表明:SCFJ的损伤主要集中在削弱梁段,实现了损伤可控,SCFJ的混凝土剥落和纵筋屈服均晚于RCJ,损伤程度明显降低;SCFJ的承载力及耗能能力与RCJ相比略低,但残余位移明显减小,在层间位移角为2.5%时,残余位移仍小于0.5%,仅为RCJ残余位移的32%,具有良好的自复位能力。

     

    Abstract: In order to reduce the residual deformation and plastic damage of traditional reinforced concrete joints (RCJ), and to facilitate the rapid repair after earthquake. A new type of self-centering frictional beam-column joint is proposed (SCFJ). The residual deformation of the structure is reduced by adding friction self-centering connectors (FC) with both self-centering ability and energy dissipation capacity in the two reduced areas of the beam end, and the damage is concentrated in the reduced beam section. In this paper, a SCFJ and a RCJ specimen are tested under cyclic loading, and their hysteresis behavior, self-centering capacity, energy dissipation capacity and damage evolution are compared and analyzed. The seismic performance of the SCFJ is also simulated by finite element analysis. The results show that the damage of SCFJ is concentrated in the reduced beam section, which realizes the damage control; the concrete spalling and the longitudinal reinforcement yielding of SCFJ are later than those of RCJ, and the damage degree is obviously reduced. The resistance capacity and energy dissipation capacity of SCFJ are slightly lower than those of RCJ, but the residual displacement is significantly reduced. When the story drift ratio is 2.5%, the residual drift ratio of SCFJ is still less than 0.5%, only 32% of the residual drift ratio of RCJ.

     

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