Force transfer mechanism and shear performance of perfobond strip connector encased in UHPC

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

Journal of building engineering Pub Date : 2025-04-15 DOI:10.1016/j.jobe.2025.112651

Xia Yang, Cheng-shuo Han, Jun-jie He, Yong-jian Zhou, Jie Wu

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Abstract

This study aims to investigate the load-transfer mechanism of Perfobond Leiste (PBL) shear connectors between ultra-high performance concrete (UHPC) slabs and steel beams. Twelve standard push-out specimens were designed and tested to examine the effects of the number of holes, hole spacing, steel fiber content, and perforating rebar diameter on the shear performance of PBLs. The failure modes, load-slip curves, and shear performance of the specimens were analyzed via test results. Additionally, based on a validated finite element analysis model, the load-transfer mechanism of PBL shear connectors was further investigated, and the influences of hole diameter, UHPC strength, and perforating rebar yield strength were explored. The results indicated that steel fibers and perforating rebars significantly influenced the failure modes of the specimens. As the steel fiber content increased from 0 % to 3 %, the initial shear stiffness, shear capacity, and failure slip increased by 184.9 %, 253.4 %, and 66.7 %, respectively. When the number of holes increased from 1 to 3, the average shear stiffness and shear capacity per hole decreased by 15.4 % and 7.2 %, respectively. For double-hole PBL connectors, the initial load-sharing ratio between the two holes was approximately 0.7, increasing to 0.9 at peak load. The recommended hole spacing for PBLs in UHPC was 120 mm, as it provided the best shear performance. Given that the group effect had a more significant impact on shear stiffness than shear capacity, it is essential to account for reduction factors when calculating the shear stiffness of multi-row PBL configurations. Based on experimental results and finite element analysis, improved prediction equations for the shear stiffness and shear capacity of single-row and multi-row PBLs encased in UHPC were proposed, and their accuracy and applicability were validated using an experimental database.

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超高性能混凝土包覆的高性能粘结带连接件的力传递机理及剪切性能

本研究旨在探讨超高性能混凝土（UHPC）板与钢梁之间的Perfobond Leiste （PBL）剪切连接件的荷载传递机制。设计并测试了12个标准推拔试件，考察了孔数、孔间距、钢纤维含量和穿孔钢筋直径对PBLs抗剪性能的影响。通过试验结果分析了试件的破坏模式、荷载-滑移曲线及抗剪性能。此外，基于验证的有限元分析模型，进一步研究了PBL剪切连接件的荷载传递机理，并探讨了孔径、UHPC强度和射孔钢筋屈服强度对接头的影响。结果表明，钢纤维和穿孔钢筋对试件的破坏模式有显著影响。钢纤维掺量从0%增加到3%时，混凝土的初始抗剪刚度、抗剪承载力和破坏滑移分别提高了184.9%、253.4%和66.7%。当孔数从1孔增加到3孔时，每孔的平均抗剪刚度和抗剪承载力分别下降15.4%和7.2%。对于双孔PBL连接器，两个孔之间的初始负载分担比约为0.7，在峰值负载时增加到0.9。在UHPC中，PBLs的推荐孔距为120mm，因为它具有最佳的剪切性能。考虑到群效应对抗剪刚度的影响大于抗剪承载力的影响，在计算多排PBL结构的抗剪刚度时，有必要考虑折减因子。在试验结果和有限元分析的基础上，提出了改进的UHPC中单排和多排pbl抗剪刚度和抗剪能力预测方程，并通过实验数据库验证了其准确性和适用性。

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.