Numerical Studies on the Performance Degradation of Headed Stud Shear Connectors in Composite Structures Under Freeze–Thaw Cycles

IF 1.8 4区工程技术 Q3 ENGINEERING, CIVIL

International Journal of Civil Engineering Pub Date : 2023-11-28 DOI:10.1007/s40999-023-00920-7

Lin Xiao, Xing Wei, Zhirui Kang, Jing Zhang, Gangyi Zhan

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Abstract

This study investigated the performance degradation of headed stud shear connectors in composite structures subjected to freeze–thaw cycles (FTCs). Parametric finite-element (FE) analysis was conducted, incorporating damage plasticity models to assess the failure progression of these shear connectors while considering concrete strength, stud dimensions, and FTC number. The parameters under scrutiny have concrete compressive strengths of 30/40/50/60 MPa, stud diameters of 13/16/19/22/25 mm, stud height–diameter ratios of 4/5/6, and FTC numbers of 0/50/100/150. A comprehensive parametric study was carried out to investigate the shear behavior of stud connectors under varying FTC conditions and identify the critical factors affecting their shear resistance. Results demonstrate that, in comparison to experimental findings, the ultimate shear strength obtained through numerical analysis falls within a margin of ± 10%, and the secant shear stiffness remains within ± 15%. Notably, FTCs exert a pronounced influence on ultimate shear strength and shear stiffness, with both parameters experiencing nearly a 20% reduction after 150 FTCs. Based on regression analysis of FE results, a new equation was proposed to determine the ultimate shear strength of headed stud shear connectors, incorporating four parameters: stud diameter, stud height, concrete compressive strength, and FTC number.

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冻融循环作用下复合结构头螺柱剪力连接件性能退化的数值研究

本研究研究了复合材料结构中受冻融循环(FTCs)影响的头螺柱剪切连接器的性能退化。在考虑混凝土强度、螺栓尺寸和FTC数量的同时，进行了参数化有限元分析，结合损伤塑性模型来评估这些剪切连接件的破坏进程。研究参数为混凝土抗压强度30/40/50/60 MPa，螺柱直径13/16/19/22/25 mm，螺柱高径比4/5/6,FTC编号0/50/100/150。对螺栓连接件在不同FTC条件下的抗剪性能进行了全面的参数研究，并确定了影响其抗剪性能的关键因素。结果表明:与试验结果相比，数值分析得到的极限抗剪强度在±10%范围内，割线抗剪刚度在±15%范围内。值得注意的是，FTCs对极限抗剪强度和抗剪刚度有显著影响，在150次FTCs后，这两个参数都降低了近20%。在有限元结果回归分析的基础上，提出了考虑钉钉直径、钉钉高度、混凝土抗压强度和FTC数4个参数的钉钉剪力连接件极限抗剪强度计算公式。

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

International Journal of Civil Engineering ENGINEERING, CIVIL-

CiteScore

3.90

自引率

5.90%

发文量

审稿时长

15 months

期刊介绍： International Journal of Civil Engineering, The official publication of Iranian Society of Civil Engineering and Iran University of Science and Technology is devoted to original and interdisciplinary, peer-reviewed papers on research related to the broad spectrum of civil engineering with similar emphasis on all topics.The journal provides a forum for the International Civil Engineering Community to present and discuss matters of major interest e.g. new developments in civil regulations, The topics are included but are not necessarily restricted to :- Structures- Geotechnics- Transportation- Environment- Earthquakes- Water Resources- Construction Engineering and Management, and New Materials.