提出了一种新型高延性纤维混凝土（HDFRC）-钢管-混凝土（HDCSTC）叠合柱，研究了螺杆列数、螺杆强度和螺母类型对HDCSTC叠合柱轴压性能的影响.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1列螺杆试件的延性无显著影响，对2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叠合柱具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，值得推广使用.

A new type of high ductility fiber reinforced concrete-steel tube-concrete （HDCSTC） composite column was proposed. The effect of number of screw rows， screw strength and nut type on the axial compression performance was studied. 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 specimens with one row of screws， but has great effect on the ductility of specimens with two rows of screws. 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 popularization.

TU398.2

国家自然科学基金资助项目（52278183）；福建省自然科学基金资助项目（2023J02019）