钢筋混凝土框架梁柱节点灌浆套筒连接抗震性能研究

发布时间：2018-01-07 07:34

本文关键词：钢筋混凝土框架梁柱节点灌浆套筒连接抗震性能研究　出处：《建筑结构学报》2017年09期 　论文类型：期刊论文

【摘要】：设计并制作了4个钢筋混凝土框架梁柱节点试件,其中两个现浇整体节点试件,两个预制装配梁柱节点试件(采用灌浆套筒连接钢筋),轴压比分别为0.3和0.4。对试件进行低周往复加载试验,研究了梁柱节点试件的破坏形态、滞回特性、刚度退化、耗能性能以及灌浆套筒接头受力状态等。结果表明:预制装配梁柱节点试件的耗能能力略低于现浇整体梁柱节点试件的耗能能力,两者破坏形态明显不同,预制装配节点试件的裂缝分布比较集中,主要分布在梁柱交界面、灌浆套筒端部区域以及梁跨中截面区域,而现浇节点试件的裂缝分布比较均匀密集;加载前期,轴压比对滞回性能影响不明显,而加载后期,轴压比对预制装配整体式节点试件节点核心区的钢筋滑移和剪切变形影响较为明显;基于试验结果,对灌浆套筒材料进行简化等效处理,并对节点不同区域采用不同的截面属性,采用OpenSees有限元软件对节点试件进行了模拟,其模拟结果与试验结果吻合较好。
[Abstract]:Four Liang Zhu joint specimens of reinforced concrete frame were designed and made, including two cast-in-place integral joint specimens and two precast assemblage Liang Zhu joint specimens (reinforced bar connected with grouting sleeve). The axial compression ratio is 0.3 and 0.4 respectively. Low cycle cyclic loading tests are carried out to study the failure mode, hysteretic characteristics and stiffness degradation of Liang Zhu joint specimens. The results show that the energy dissipation capacity of the precast assembly Liang Zhu joint specimen is slightly lower than that of the Cast-in-place whole Liang Zhu joint specimen, and the failure patterns of the two specimens are obviously different. The crack distribution of prefabricated joints is concentrated, mainly in Liang Zhu interface, the end of grouting sleeve and the section of beam span, while the crack distribution of cast-in-place joints is uniform and dense. In the early stage of loading, the effect of axial compression ratio on hysteretic performance is not obvious, but at the later stage of loading, the effect of axial compression ratio on the slip and shear deformation of the core of prefabricated integral joints is obvious. Based on the test results, the grouting sleeve material was simplified and equivalent treatment was carried out, and different cross-section attributes were adopted in different regions of the joints. The OpenSees finite element software was used to simulate the joint specimens. The simulation results are in good agreement with the experimental results.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;
【基金】：国家自然科学基金项目(51421005,51678018) 北京市交通行业科技项目(2016-gdsbssc-01-029)
【分类号】：TU352.11;TU375
【正文快照】： 轴压比为0.3,而试件CBCJ-2、PBCJ-2的设计轴压比0引言为0.4。预制梁和柱端的钢筋均通过灌浆套筒进行连接,并现浇混凝土形成整体,试件具体尺寸及构造预制装配技术具有机械化程度高、劳动力利用如图1所示。预制构件混凝土设计强度等级为C30,率高、能源消耗小、成本和质量可控等

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