部分充填式窄幅钢箱-UHPC组合梁抗裂性能  

Crack resistanceof partiallyfilled narrow steelbox-UHPC compositebeam

作　　者：莫时旭[1,2] 方威 郑艳 房洋洋[1,2] MO Shixu;FANG Wei;ZHENG Yan;FANG Yangyang(College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《混凝土》2024年第7期89-93,98,共6页Concrete

基　　金：国家自然科学基金(52068012);广西自然科学基金(2021GXNSFAA220101);广西建筑新能源与节能重点实验室项目(桂科能22-J-21-1)。

摘　　要：为研究部分充填式窄幅钢箱-UHPC组合梁的抗裂性能,开展了4根不同钢纤维掺量的部分充填式窄幅钢箱-UHPC组合梁与1根部分充填式窄幅钢箱-NC组合梁静力加载试验。试验表明:在负弯矩作用下,部分充填式窄幅钢箱-UHPC组合梁裂缝呈现数量多、短小且密集的特点;同等配筋率的条件下,不同钢纤维掺量(0、1%、2%和3%)部分充填式窄幅钢箱-UHPC组合梁与部分充填式窄幅钢箱-NC组合梁相比,在弹性阶段其刚度明显提高,最大裂缝宽度随钢纤维掺量的增加而减少,开裂强度分别提高了36.0%、48.8%、82.0%和112.0%,UHPC显著提高了组合梁的抗裂性能;可以参考按照JTG 3362—2018中裂缝宽度式乘以0.8的修正系数来计算部分充填式窄幅钢箱-UHPC组合梁裂缝宽度。In order to study the crack resistance of partially filled narrow steel box-UHPC composite beams,four partially flled narrow steel box-UHPC composite beams with different steel fiber content and one partially filled narrow steel box-NC composite beam were tested under static loading.The results show that the cracks of the partially flled narrow steel box-UHPC composite beam are numerous,short and dense under the action of negative bending moment.Equivalent reinforcement ratio under the condition of different steel fiber content(0,1%,2%and 3%)steel box-UHPC composite beams with partial filling type narrow narrow steel box-NC part flling type composite beams,compared to its stiffness increased significantly in the elastic stage,the maximum crack width decrease with the increase of steel fiber content,cracking strength by 36.0%,48.8%,82.0%and 112.0%,UHPC significantly improves the crack resistance of composite beams.The crack width of partially filled narrow steel box-UHPC composite beam can be calculated according to the crack width formula in the JTG 3362—2018 by the correction factor of 0.8.

关 键 词：组合梁 超高性能混凝土 钢纤维 裂缝宽度 

分 类 号：TU528.01[建筑科学—建筑技术科学]