Shear behavior and bearing capacity of reinforced concrete beams with a UHPC stay-in-place formwork

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-09-06 DOI:10.1016/j.istruc.2024.107131

Peng Wang, Jie Huang, Yi Tao, Qingxuan Shi, Bin Wang

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Abstract

To investigate the shear behavior of composite beams with a UHPC stay-in-place formwork, seven composite beam specimens with a UHPC stay-in-place formwork (URB) and one reference specimen for normal reinforced concrete (RC) beam were designed in this paper. An experimental study was conducted to investigate the shear behavior of composite beams with a UHPC stay-in-place formwork under static loading. The research parameters included shear-span ratio, transverse rib spacing, and stirrup ratio. The results indicated that UHPC stay-in-place formwork can effectively improve the stiffness, cracking resistance, and shear resistance of members. Compared with the RC beam, the shear load when the first bending crack appeared () and the shear load when the first shear diagonal crack appeared () of composite beams increased by 328 % ∼ 422 % and 175 % ∼ 206 %, the stiffness when the first bending crack appeared () and the stiffness when the first shear diagonal crack appeared () increased by 30.3 % ∼ 44.8 % and 4.9 % ∼ 36.0 %, respectively, and the shear bearing capacity increased by 72 % ∼ 89 %. The shear bearing capacity of composite beams increased significantly with the decrease of shear-span ratio. The increase in stirrup ratio had an improvement in the shear bearing capacity of composite beams, but had a small impact on the cracking resistance. The decrease in spacing of transverse ribs did not yield a substantial increase in shear bearing capacity for composite beams. Nonetheless, the difference between (ultimate shear bearing capacity) and exhibited an obvious increasing trend, suggesting an enhancement in cracking resistance. The interface treatment method of setting transverse ribs improved the integrity of the composite beam and avoided longitudinal interface separation between the formwork and the core concrete. The presence of steel fibers effectively inhibited crack development through their bridging action. Finally, the calculation model of shear bearing capacity of composite beams with a UHPC stay-in-place formwork is established based on the truss-arch model. The average ratio of the calculated value to the experimental value is 0.99, with a coefficient of variation of 0.06. The theoretical calculated are in good agreement with the experimental results.

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采用超高性能混凝土现浇模板的钢筋混凝土梁的抗剪行为和承载能力

为了研究带有超高性能混凝土现浇模板的复合梁的剪切行为，本文设计了七个带有超高性能混凝土现浇模板（URB）的复合梁试件和一个普通钢筋混凝土（RC）梁的参考试件。本文进行了一项实验研究，以探讨带有超高性能混凝土现浇模板的复合梁在静态荷载下的剪切行为。研究参数包括剪跨比、横向肋间距和箍筋比。结果表明，超高性能混凝土现浇模板能有效提高构件的刚度、抗裂性和抗剪性。与钢筋混凝土梁相比，复合梁首次出现弯曲裂缝时的剪力荷载（）和首次出现剪切斜裂缝时的剪力荷载（）分别增加了 328 % ∼ 422 % 和 175 % ∼ 206 %，首次出现弯曲裂缝时的刚度（）和首次出现剪切斜裂缝时的刚度（）分别增加了 30.3 % ∼ 44.8 % 和 4.9 % ∼ 36.0 %，剪切承载力提高了 72 % ∼ 89 %。随着剪跨比的减小，复合梁的抗剪承载力显著提高。箍筋比的增加提高了复合梁的抗剪承载力，但对抗裂性能的影响较小。横向肋间距的减小并没有显著提高复合梁的抗剪承载力。不过，（极限剪切承载力）与（极限剪切承载力）之间的差值呈现出明显的增加趋势，表明抗裂性能有所提高。设置横向肋条的界面处理方法提高了复合梁的整体性，避免了模板与核心混凝土之间的纵向界面分离。钢纤维的存在通过其架桥作用有效抑制了裂缝的发展。最后，基于桁架拱模型，建立了采用超高性能混凝土现浇模板的复合梁抗剪承载力计算模型。计算值与实验值的平均比值为 0.99，变异系数为 0.06。理论计算结果与实验结果十分吻合。

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.

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