Flexural behavior of partially filled-narrow steel box-UHPC-NC composite beams under negative moment

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-22 DOI:10.1016/j.istruc.2025.109181

Junxiang Zhu , Yan Zheng , Xinning Tan , Jianfan Liu , Hailin Yang

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引用次数: 0

Abstract

This paper presents a partially filled-narrow steel box-ultra-high performance concrete (UHPC)- normal concrete (NC) composite beam. Static loading test was conducted on partially filled narrow steel box-UHPC-NC composite beams under negative moments, with test parameters including reinforcement ratio, flange materials and the height of the infilled concrete. The mechanical mechanism of the composite beams and the influence law of each parameter on the flexural capacity were analyzed. The calculation formula of the moment at a crack width of 0.05 mm and the ultimate flexural capacity of composite beams were proposed. The results demonstrated that the overall performance of the composite beams was satisfactory, with all the specimens displaying distinct bending failure characteristics. Increasing the steel fiber volume content of UHPC in the flange from 0 to 2 % resulted in a 50.8 % increase in cracking load. When the reinforcement ratio increased from 1.5 % to 2 % and 3 %, the ultimate flexural capacity of the composite beams improved by 3.2 % and 8.2 %, respectively, although ductility decreased. The height of the infilled concrete significantly influenced the failure modes and flexural capacity of the composite beams, composite beams with infilled concrete exhibited a 45.4 % increase in ultimate flexural capacity compared to those without. The theoretical values derived from the proposed formulas for the moment at a crack width of 0.05 mm and ultimate flexural capacity aligned closely with the experimental results.

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负弯矩作用下部分填充窄钢箱- uhpc - nc组合梁的受弯性能

本文提出了一种局部填充的窄钢箱-超高性能混凝土-普通混凝土组合梁。对负弯矩作用下部分填充的窄钢箱- uhpc - nc组合梁进行静载试验，试验参数包括配筋率、法兰材料和填充混凝土高度。分析了组合梁的受力机理及各参数对组合梁抗弯承载力的影响规律。提出了裂缝宽度0.05 mm处弯矩和组合梁极限抗弯承载力的计算公式。结果表明，组合梁整体性能良好，试件均表现出明显的弯曲破坏特征。将UHPC在法兰中的钢纤维体积含量由0 提高到2 %，可使开裂载荷提高50.8 %。当配筋率从1.5 %增加到2 %和3 %时，组合梁的极限抗弯承载力分别提高了3.2 %和8.2 %，但延性有所下降。混凝土高度对组合梁的破坏模式和抗弯承载力有显著影响，掺砼组合梁的极限抗弯承载力比未掺砼组合梁提高了45.4% %。在裂缝宽度0.05 mm处的弯矩和极限抗弯承载力的理论值与试验结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.