角钢耗能自复位混凝土框架节点耗能性能研究
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1.东莞市大业施工图审查有限公司;2.重庆大学 土木工程学院

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基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Study on energy dissipation performance of self-centering concrete frame joint based on energy dissipation of angle steel
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Affiliation:

1.Dongguan Daye construction drawing review Co., Ltd;2.College of Civil Engineering,Chongqing University

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    提出了角钢耗能自复位混凝土框架设计方法,建立了节点的有限元数值模型,并试验验证了其有效性。对不同预应力筋抗弯承载力比φdes 的节点进行了模拟分析,研究了其在地震作用下的自复位性能、耗能能力和材料损伤等性能指标。为提高该类节点耗能能力,通过改变角钢竖肢螺杆标距做了进一步研究。研究表明:角钢耗能节点具有良好的自复位性能,但耗能能力不足;减小 φdes,自复位能力降低、残余变形加大,但耗能能力增强。因此,与混合连接节点相比,应适当降低节点 φdes最低取值,以弥补其耗能能力的不足。角钢竖肢的塑性变形是节点的主要耗能方式,且集中在竖肢的螺栓孔高度和竖肢转角位置;减小竖肢螺杆标距,且保持材料其他参数不变,这将导致 φdes减小、截面抗弯承载力提高,节点耗能能力将随之增强。

    Abstract:

    A design method was proposed for self-centering concrete frame joints with energy-dissipation angle steel. A numerical analysis model was established and its validity was verified by experiments. After the joints with different prestressed moment capacity ratio φdes were simulated, the energy dissipation capacity, self-centering performance and material damage under low-cycle repeated loads were studied. Changing the screw gauge distance of angle vertical leg, the measures to improve its energy-consumption capacity were further explored. The results show that the angle energy-consuming joints have perfect self- centering performance, but the energy consuming capacity is slightly insufficient. As the value of φdes decreases, the residual deformation increases and the self-centering ability decreases, but the energy dissipation ability increases. Therefore, compared with the hybrid connection joint, the φdes value of joint should be appropriately reduced to make up for its insufficient energy dissipation. The plastic deformation of the Angle vertical leg is the main energy dissipation mode of the joint, concentrating on the height of the bolt hole and the turning of the vertical leg. If the distance between the vertical screws is reduced and the other material parameters keeps unchanged, it will lead to a decrease in φdes values, an increase in the bending capacity of the section and an increase in the energy dissipation capacity of the joint.

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  • 收稿日期:2021-03-05
  • 最后修改日期:2021-04-17
  • 录用日期:2021-04-27
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