Experimental studies on pullout performance of anchor studs in high-performance concrete with hybrid steel fibers and synthetic fibers

IF 6.7 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-07-02 DOI:10.1016/j.jobe.2025.113380

Zhao Chen, Jiajun Liu, Feng Zhu, Kaile Feng, Ioannis Boumakis

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引用次数: 0

Abstract

Pullout performance of studs in high-performance hybrid fiber-reinforced concrete (HPHFRC) with varying proportions of steel fibers and TX12 synthetic fibers is investigated. A total of 24 unconfined anchor pullout tests were conducted, including eight scenarios of hybrid fiber combinations. The failure modes, ultimate tensile strength (Nu), and pullout load-displacement behavior of studs were analyzed. The incorporation of fibers significantly enhanced Nu and improved post-peak ductility. Hybrid fibers significantly enhance concrete performance compared to single fibers by improving crack resistance and creating a bridging network, leading to greater ultimate tensile strength, ductility, and toughness. Increased fiber content enlarges the bearing area, inducing an edge effect. This alters failure modes and anchorage performance, requiring greater clear distances to prevent radial cracking or splitting failure. A modified predictive model for Nu in HPHFRC is proposed, considering the influence of different fiber types. Compared to existing models, the proposed model demonstrated superior agreement with experimental data.

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钢纤维与合成纤维混合高性能混凝土中锚杆的拉拔性能试验研究

研究了不同钢纤维和TX12合成纤维掺量的高性能混杂纤维-钢筋混凝土（HPHFRC）中螺柱的拉拔性能。共进行了24次无侧限锚拔试验，包括8种混合纤维组合方案。分析了螺栓的破坏模式、极限抗拉强度（Nu）和拉拔载荷-位移特性。纤维的掺入显著提高了Nu，改善了峰后延展性。与单一纤维相比，混合纤维通过提高抗裂性和建立桥接网络，显著提高了混凝土的性能，从而提高了极限抗拉强度、延展性和韧性。纤维含量的增加扩大了承载面积，产生了边缘效应。这改变了破坏模式和锚固性能，需要更大的清晰距离来防止径向开裂或劈裂破坏。考虑不同纤维类型的影响，提出了一种改进的HPHFRC中Nu的预测模型。与现有模型相比，本文提出的模型与实验数据吻合较好。

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

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.