莫时旭, 柴龙杰, 郑艳,等.负弯矩作用下部分充填式窄幅钢箱-UHPC组合梁刚度分析[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2023100025

MO S X, CHAI L J, ZHENG Y, et al. Stiffness analysis of partially filled narrow steel box-UHPC composite beam under negative moment [J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787.2023100025

负弯矩作用下部分充填式窄幅钢箱-UHPC组合梁刚度分析(网络首发)

莫时旭1,2, 柴龙杰1, 郑艳1,2, 黄意均1, 檀新宁1

1.桂林理工大学 土木与建筑工程学院，广西 桂林  541004；2.广西绿色建材与建筑工业化重点实验室，广西 桂林  541004

摘要:为研究负弯矩作用下部分充填式窄幅钢箱-UHPC组合梁的抗弯性能，采用反向集中力对9根组合梁 进行了静载试验。基于不同的钢纤维掺量、配筋率和相对充填高度，研究其对部分充填式窄幅钢箱-UHPC 组合梁的受力过程、应变行为、刚度和抗裂性的影响。试验结果表明，与部分充填式窄幅钢箱-NC组合梁和 窄幅钢箱-UHPC组合梁相比，部分充填式窄幅钢箱-UHPC组合梁的极限承载力、正常使用和承载能力极限 状态的刚度最大提高57%、25%和21%，裂缝宽度在0.05 mm， 0.1 mm、0.2 mm时所对应的荷载最大提高 155%、266%和 100%。因忽略滑移的影响，按现行规范计算负弯矩作用下的组合梁挠度过于保守。考虑负 弯矩作用下组合梁的滑移影响，按有效惯性矩法计算了试验梁的挠度，计算结果较为准确。

关键词:部分充填式窄幅钢箱-UHPC组合梁;超高性能混凝土（UHPC）;负弯矩;极限承载力;刚度;裂  缝宽度

中图分类号: TU398⁺.9

doi:10.16186/j.cnki.1673-9787.2023100025

基金项目:国家自然科学基金项目（52068012）；广西自然科学基金项目（2021GXNSFAA220101）；广西绿色建材与建筑工业化重点实验室项目（桂科能 22-J-21-1）

收稿日期:2023-10-11

修回日期:2023-12-05

网络首发日期: 2023-12-06

Stiffness analysis of partially filled narrow steel box-UHPC composite beam under negative moment（Online）

MO Shixu1,2, CHAI Longjie1, ZHENG Yan1,2, HUANG Yijun1, TAN Xinning1

1.College of Civil Engineering and Architecture， Guilin University of Technology， Guilin  541004， Guangxi ，China；2.Guangxi Key Laboratory of Green Building Materials and Construction Industrialization， Guilin  541004， Guangxi， China

Abstract:In order to study the flexural properties of partially filled narrow steel box-UHPC composite beams under negative moment， static load tests were carried out on 9 composite beams with reverse concentrated force. Based on the different steel fiber content， reinforcement ratio and relative filling height， the influence on the loading process， strain behavior， stiffness and crack resistance of the partially filled narrow steel box-UHPC composite beam is studied. The test results show that compared with the partially filled narrow steel box-NC composite beam and the narrow steel box-UHPC composite beam， the ultimate bearing capacity， serviceability and ultimate limit stage stiffness of the partially filled narrow steel box-UHPC composite beam increase by 57%， 25% and 21%. When the crack width is 0.05 mm， 0.1 mm， 0.2 mm， the corresponding load increases by 155%， 266% and 100%. The deflection of composite beam under the action of negative moment is too conservative due to ignoring the influence of slip. The deflection of the test beam was calculated according to the effective moment of inertia method considering the sliding effect of the composite beam under the action of negative moment and was more accurate.

Key words:partially filled narrow steel box-UHPC composite beams;ultra-high performance concrete （UHPC）;ultimate bearing capacity;deflection;crack width

CLC: TU398⁺.9