带可更换耗能钢棒的装配式混凝土单侧屈服梁柱节点抗震性能试验研究

EXPERIMENTAL STUDY ON HYSTERETIC PERFORMANCE OF SINGLE-SIDE YIELDING PRECAST CONCRETE BEAM-COLUMN CONNECTION WITH REPLACEABLE ENERGY DISSIPATION BARS

  • 摘要: 提出了一种新型的钢筋连接器——可调组合钢筋连接套筒,并基于此组装了一套耗能连接件。对耗能连接件开展了轴向的低周往复加载试验,验证了其荷载传递的可靠性以及优异的耗能性能。将耗能连接件内置于装配式混凝土框架梁端底部,提出了一种带可更换耗能钢棒的单侧屈服梁柱节点(REDB-SYBC)。对试件开展拟静力试验研究,分析节点的损伤分布、破坏形态、滞回特性、耗能能力等抗震性能。试件滞回曲线稳定饱满无捏缩,抗震性能良好。试验结果表明:新型节点单侧屈服的变形模式减少了楼板的变形与损伤,充分发挥了梁底连接件的耗能能力,其主要损伤及破坏均发生在梁底耗能钢棒上,实现了损伤集中的设计目标以及“强柱弱梁”的抗震设计原则;利用新型连接套筒的内部空间即可实现耗能钢棒的更换,经过更换和修复后的节点各项抗震性能与初始节点基本相当。

     

    Abstract: A new type of coupler for connecting bars, non-slipping threaded sleeve assembly, is proposed, and based on this, replaceable energy dissipation connection is assembled. An axial low-cycle reversed loading test was carried out, indicating the reliability of load transfer and excellent energy dissipation performance. An innovative single-side yielding beam-column connection with replaceable energy dissipation bars (REDB-SYBC) is developed by placing the energy dissipation connection in the bottom of the beam end of the prefabricated concrete frame. The quasi-static test was carried out to evaluate the seismic behaviors of the connection, such as damage distribution, failure pattern, hysteretic characteristics, and energy dissipation capacity. The hysteretic curves of the specimens are stable and full without pinching, showing a good seismic performance. The experimental results show that: the single-side yielding deformation pattern of the REDB-SYBC connection minimizes the deformation of the adjacent floor slabs and gives full play to the advantage of energy dissipation capacity of connectors at beam bottom, and makes the main damage and failure occur on the energy dissipation bars. That realizes the design goal of damage concentration and the seismic design principle of “strong column and weak beam”. The energy dissipation bars can be replaced by the inner space of the non-slipping threaded sleeve assembly. The seismic behaviors of the repaired specimens are basically the same as those of the original specimens.

     

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