(辽宁科技大学土木工程学院， 鞍山 114000)

摘要: 以轴压比及截面尺寸为参数，对 12 个中空夹层钢管混凝土试件进行压￣扭试验，并结合数值模型分析了扭转全过程截面剪应变开展及钢管与夹层混凝土相互作用力。 结果表明:较小的轴向压力对极限抗扭承载力及扭转刚度均影响甚微，所有试件均表现出较好的延性。 承载力受外钢管强度影响较大，受混凝土强度影响较小，夹层混凝土对组合抗扭强度提高的作用随含钢率的增大而减小。 扭转全过程截面不同位置处应变开展曲线重合度高，表明全截面约束均匀且变形一致。 夹层混凝土剪应力随着与截面中心距离的增大而增大，外钢管与夹层混凝土相互作用力相较于内钢管要大得多，二者均表现为加载初期增长较快，随后逐渐变缓，外钢管屈服后增幅趋近于 0。

关键词: 中空夹层钢管混凝土； 压￣扭试验； 轴压比； 抗扭性能； 含钢率； 约束效应

中图分类号:TU398. 9 文献标志码:A 文章编号:1002￣848X(2022)06￣0090￣07

DOI:10. 19701 / j.jzjg.20200863

Experimental study on torsional behavior of concrete￣filled double skin steel tubes under axial load

LIAO Xu， LI Jiren， WANG Qingli

(School of Civil Engineering， Liaoning University of Science and Technology， Anshan 114000， China)

Abstract: With the axial compression ratio and section size as parameters， the compression￣torsion test of 12 concrete￣filleddouble skin steel tube specimens was carried out， and the cross￣section shear strain development during the whole torsionprocess and the interaction force between the steel tube and the sandwich concrete were analyzed combined with thenumerical model. The results show that the small axial pressure has little effect on the ultimate torsional bearing capacityand torsional stiffness， and all the specimens show good ductility. The bearing capacity is greatly affected by the strength ofthe outer steel tube and less by the strength of the concrete， and the effect of sandwich concrete on the improvement of thecombined torsional strength decreases with the increase of the steel ratio. The strain development curve at different positionsof the cross section during the whole torsion process has a high degree of overlap， which indicates that the full cross sectionhas uniform constraints and uniform deformation. And the shear stress of the sandwich concrete increases with the distancefrom the center of the cross section. The interaction force between the outer steel tube and the sandwich concrete is muchlarger than that of the inner steel tube， both of which show a rapid increase in the initial loading and a gradual slowdownlater， and the increase rate is close to 0 after outer steel tube yielding.

Keywords:concrete￣filled double skin steel tube； compression￣torsion test； axial compression ratio； torsional behavior；steel ratio； restraint effect

∗辽宁省教育厅基金(2017LNQN12)，辽宁科技大学人才引进基金(2017RC09)，辽宁省“兴辽英才计划”(XLYC1902009)。

第一作者:廖栩，硕士研究生，主要从事钢￣混凝土组合结构方面的研究，Email:liaoxu1995@ 126.com。

[引用本文] 廖栩，李吉人，王庆利. 轴压荷载下中空夹层钢管混凝土抗扭性能试验研究[ J]. 建筑结构，2022， 52(6):90￣96，125. LIAO Xu， LI Jiren， WANG Qingli. Experimental study on torsional behavior of concrete￣filled double skinsteel tubes under axial load[J]. Building Structure， 2022， 52(6):90￣96，125.