HDFRC-钢管-混凝土叠合柱轴压性能研究
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华侨大学

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Axial Compressive Behavior of High-Ductility Fiber-Reinforced Concrete-Steel Tube-Concrete Composite Columns
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Huaqiao University

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    摘要:

    传统钢筋混凝土叠合柱的预制构件在制作时由于内部有横穿的箍筋存在,无法在内侧支模板,常需采用离心法实现其内部中空状态,制作工艺复杂。为解决这个问题,提出了一种新型高延性纤维混凝土-钢管-混凝土(High-Ductility Fiber-Reinforced Concrete-Steel Tube-Concrete, HDCSTC)叠合柱。开展了7个HDCSTC叠合柱和1个钢筋混凝土柱的轴压试验,主要变化参数包括螺杆列数、螺杆强度和螺母类型。结果表明,增加螺杆列数能够有效改善试件的峰值后延性;螺杆强度增加,对一列螺杆试件的延性无显著影响,对两列螺杆试件的延性影响较大;吊环螺母能够与外侧高延性纤维混凝土建立有效拉结,改善试件的峰值后性能;HDCSTC叠合柱拥有与钢筋混凝土柱同等优异的轴压性能,且施工方便无技术限制,值得进行进一步的研究推广使用。

    Abstract:

    The precast member of the traditional reinforced concrete composite column can not be supported on the inside due to the existence of the stirrup across the inside, so the centrifugal method is often used to achieve its internal hollow state, and the production process is complicated. A new type of High-Ductility Fiber-Reinforced Concrete-Steel Tube-Concrete (HDCSTC) composite column was proposed to improve this problem. The axial compression tests of 7 HDCSTC composite columns and 1 reinforced concrete column were carried out. The main parameters include the number of screw rows, screw strength and nut type. The results show that increasing the number of screw rows can effectively improve the post-peak ductility of the specimen. The increase of screw strength has no significant effect on the ductility of one row of screw specimens, but has great effect on the ductility of two rows of screw specimens. The hanging ring nut can establish an effective tensioning knot with the outer high-ductility fiber-reinforced concrete, and improve the post-peak performance of the specimen. The HDCSTC composite column has the same excellent axial compression performance as the reinforced concrete column, and the construction is convenient and has no technical limitation, which is worthy of further research and popularization.

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  • 收稿日期:2023-12-17
  • 最后修改日期:2024-04-03
  • 录用日期:2024-04-07
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