使用 perfobond 带状连接件的预制 HSS-UHPC 复合梁抗剪性能实验研究

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2024-11-21 DOI:10.1016/j.engstruct.2024.119318

Shaohua He , Defeng Zhou , Baisheng Bai , Changxi Liu , You Dong

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引用次数: 0

摘要

高强度钢（HSS）-超高性能混凝土（UHPC）复合梁在预制桥梁建筑中具有很强的竞争力。本文采用四点加载系统来评估预制 HSS-UHPC 复合梁在剪切荷载作用下的承载机理。本文制备并测试了五个大型复合梁试件，这些试件在钢板穿孔形式、穿孔板布置、UHPC 板宽度和板锥形后缘等参数上存在差异。对复合梁的破坏模式、剪切刚度、荷载-挠度行为、应变曲线和界面滑移特性进行了介绍和讨论。实验结果表明，预制 HSS-UHPC 复合梁具有较大的剪切刚度和良好的延展性。然而，在提高剪切刚度的同时，初始开裂荷载却降低了 26.8%，这归因于中性轴的上移。用拼图形开口取代穿孔钢板上的圆孔，可使复合梁的剪切刚度和延展性分别提高 79.0% 和 47.4%。此外，采用双排穿孔钢板还能进一步提高复合梁的抗剪性能，这是因为在剪跨区域采用了更密集的 PBL 布局。该研究还检验了现有规范和典型剪切承载力公式对 HSS-UHPC 复合梁的适用性，并提出了一个预测模型来精确计算梁的剪切承载力。所提出的公式为确定此类复合梁的抗剪能力提供了合理的方法。

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Experimental study on shear performance of prefabricated HSS-UHPC composite beam with perfobond strip connectors

High-strength steel (HSS)-to-ultra-high performance concrete (UHPC) composite beams are highly competitive in prefabricated bridge constructions. This paper employs a four-point loading system to evaluate the load-bearing mechanism of prefabricated HSS-UHPC composite beams under shear loadings. Five large-scale composite beam specimens are prepared and tested, with variations in parameters such as steel plate perforation form, arrangement of perforated plate, UHPC slab width, and presence of slab tapered haunches. The composite beams' failure modes, shear stiffness, load-deflection behavior, strain profiles, and interfacial slippage characteristics are presented and discussed. Experimental results indicate that the prefabricated HSS-UHPC composite beams exhibit large shear stiffness and favorable ductility, and the composite beams with tapered haunches demonstrate a 26.9 % higher shear stiffness than those without. However, this improvement is accompanied by a 26.8 % reduction in initial cracking load, attributed to the upward movement of the neutral axis. Replacing circular holes in the perforated steel plate with puzzle-shaped openings increases the shear stiffness and ductility of the composite beam by 79.0 % and 47.4 %, respectively. Additionally, the adoption of double-row perforated plates further improves the shear performance of the composite beam due to the more intensive layout of PBLs in shear-span regions. The study also examines the applicability of existing codes and typical shear capacity formulas to HSS-UHPC composite beams and proposes a predictive model to calculate the shear capacity of the beams accurately. The proposed equations provide a reasonable methodology for determining the shear resistance of such composite beams.

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来源期刊

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.