(1 苏州科技大学江苏省结构工程重点实验室, 苏州 215011;2 浙江交通职业技术学院桥隧工程研究所, 杭州 311112)

摘要: 为研究连续曲线双箱钢-混组合梁的弯扭性能,以实际工程为背景,以曲线半径和横隔板连接方式为参数,设计了 3 根 1 ∶10 的缩尺模型,并对其进行静力加载试验,研究试验梁跨中截面的荷载-挠度曲线、横向挠度分布和钢梁与混凝土板间的相对滑移规律. 结果表明,3 根梁的破坏形式一致,均为弯扭破坏,负弯矩区在 0. 1Pu( Pu 为极限荷载)时就会开裂;极限荷载时,试验梁跨中截面外侧挠度达内侧的 1. 37 倍;试验梁的抗弯刚度和抗扭刚度均随着曲线半径的增大而提高,横隔板连接方式对其弯扭性能影响不大;混凝土板与钢梁结合面切向滑移随着曲线半径的增大而减小,横向栓接试验梁的滑移量小于横向焊接试验梁的;切向滑移量最大值出现在跨度的 3 / 4 处,径向滑移量最大值出现在中支点附近处.

关键词: 双箱钢-混组合梁; 横隔板连接方式; 曲线半径; 弯扭性能; 滑移

中图分类号:TU398 文献标志码:A 文章编号:1002-848X(2022)03-0124-06

DOI:10. 19701 / j. jzjg. LS210213

Experimental study on bending and torsion performance of continuous curved double-boxsteel-concrete composite beams

YUAN Xiaojing1, LIU Fan1, ZHAO Wei2, HUANG Haibing1, HAO Hao1

(1 Key Laboratory of Structural Engineering of Jiangsu Province, Suzhou University of Science and Technology,Suzhou 215011, China; 2 Bridge and Tunnel Engineering Research Institute,Zhejiang Institute of Communications, Hangzhou 311112, China)

Abstract: In order to study the bending and torsion performance of continuous curved double-box steel-concrete compositebeams, taking the actual engineering as the background and taking curve radius and connection method of transversediaphragm as parameters, three scaled 1 ∶ 10 models were designed and static loading tests were carried out. Theload-deflection curve and lateral deflection distribution of the mid-span section of the test beam and the law of relative slipbetween the steel beam and the concrete slab were studied. The results show that the failure modes of the three beams arethe same, all of which are bending and torsion failures and the negative bending moment zone will crack at 0. 1Pu(Puis theultimate load) . Under ultimate load, the outer deflection of the mid-span section of the test beam is 1. 37 times that of theinner side. The bending stiffness and torsion stiffness of the test beam both increase with the increase of the curve radius.The connection method of transverse diaphragm has little influence on the bending and torsion performance. The tangentialslip of the interface between concrete slab and steel beam decreases with the increase of the curve radius. The slip of thelateral bolted test beam is smaller than the lateral welded test beam. The maximum tangential slip appears at 3 / 4 of thespan and the maximum radial slip appears near the middle fulcrum.

Keywords:double-box steel-concrete composite beam; connection method of transverse diaphragm; curve radius; bendingand torsion performance; slip

∗江苏省建设系统科技项目(2020ZD08) ,浙江省交通运输厅科技项目(2018042) .

第一作者:袁晓静,硕士,实验师,主要从事混凝土结构及组合结构性能研究,Email: xiaojing0318006@ 126. com.

[引用本文] 袁晓静,刘凡,赵伟,等. 连续曲线双箱钢-混组合梁弯扭性能试验研究[ J] . 建筑结构,2022,52( 3) :124-129. YUAN Xiaojing, LIU Fan, ZHAO Wei, et al. Experimental study on bending and torsion performance ofcontinuous curved double-box steel-concrete composite beams[ J] . Building Structure,2022,52(3) :124-129.