(1 重庆交通大学山区桥梁与隧道工程国家重点实验室,重庆 400074;2 重庆市开州区住房保障中心,重庆 405499;3 中国交通建设股份有限公司总承包经营分公司,北京 100088)

摘要: 集束钉群装配式钢-混组合梁由于构造、施工与现浇组合梁有差异,其钢与混凝土界面滑移刚度受钉群布置影响.为研究集束度对装配式钢-混组合梁界面滑移特性的影响规律,开展了 5 个具有相同抗剪连接程度的集束钉群装配式钢-混组合梁加载试验,研究不同集束度试验梁的荷载-位移曲线、破坏形态、钢-混凝土交界面滑移特性以及截面应变变化规律的差异.试验结果表明:集束度对集束钉群装配式钢-混组合梁的屈服荷载影响较小;界面滑移随集束度的增大而增大;随着集束度的增大,试验梁的截面应变不再服从平截面假定.基于试验及理论分析,提出了考虑集束度和钉群折减系数的装配式钢-混组合梁界面滑移线性刚度计算公式,该公式计算结果与本文及文献的试验值吻合良好.

关键词: 钢-混组合结构;装配式结构;集束钉群;栓钉群;集束度;界面滑移;线性刚度

中图分类号:TU398+. 9 文献标志码:A 文章编号:1002-848X(2022)18-0086-06

DOI:10.19701 / j.jzjg.20201389

Research on interface slip properties of assembled steel-concrete composite beamswith cluster nail groups

FAN Liang1,WU Jianghong2,TAN Yang1,CHEN Lin3

(1 State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;2 Chongqing Kaizhou District Housing Security Center,Chongqing 405499,China;3 General Contractingand Operation Branch of China Communications Construction Co. ,Ltd. ,Beijing 100088,China)

Abstract: The steel-concrete interface slip stiffness of assembled steel-concrete composite beams with cluster nail groups isaffected by the nail group arrangement due to the difference in construction and construction from cast-in-place compositebeams. In order to study the influence rule of the cluster degree on the interface slip properties of assembled steel-concretecomposite beams,five loading tests on assembled steel-concrete composite beams with cluster nail groups and the samedegree of shear connection were carried out to investigate the differences in the load-displacement curve,the damagepattern,the slip properties of the steel-concrete interface and the change rule of strain in the section of the test beams withdifferent cluster degrees. The test results show that the effect of the cluster degree on the yield load of assembledsteel-concrete composite beams with cluster nail groups is small;the interface slip increases with the increase of the clusterdegree;the cross-sectional strain of the test beams no longer obeys the assumption of flat section as the cluster degreeincreases. Based on the experimental and theoretical analyses,a linear stiffness calculation formula for the interface slip ofassembled steel-concrete composite beams considering the cluster degree and nail group discount factor was proposed,andthe calculation results of the formula are in good agreement with the experimental values in this paper and the literature.

Keywords:steel-concrete composite structure;assembled structure;cluster nail group;stud group;cluster degree;interface slip;linear stiffness

∗国家自然科学基金项目(U20A20312),重庆市自然科学基金项目(cstc2020jcyj-msxmX0062).

第一作者:范亮,博士,教授,主要从事钢-混凝土组合结构研究,Email:fanliang@ cqjtu. edu. cn.

[引用本文] 范亮,邬江红,谭阳,等. 集束钉群装配式钢-混组合梁界面滑移特性研究[ J]. 建筑结构,2022,52(18):86-91. FAN Liang,WU Jianghong,TAN Yang,et al. Research on interface slip properties of assembled steel-concrete composite beams with cluster nail groups[J]. Building Structure,2022,52(18):86-91.