土木与环境工程学报（中英文）2025，Vol.47Issue(3)：171-179,9.DOI:10.11835/j.issn.2096-6717.2023.055
双向荷载下组合剪力键的剪切机理及抗剪强度计算模型
Shear mechanism and shear strength calculation of composite shear connectors under biaxial load
摘要
Abstract
To investigate the shear performance of composite shear connectors under biaxial load,a finite element model was established and verified by experimental tests.The failure modes of composite shear connectors under biaxial load and unidirectional push-out load were compared,and the relationship between biaxial load and shear strength ratio was also analyzed.The effects of concrete strength and through reinforcement diameter on the shear strength under biaxial load were clarified.The shear mechanism of the composite shear connector was revealed.A shear strength model of composite shear connector under biaxial load was established by multivariable regression analysis.The results show that lateral compression can effectively prevent the transverse expansion of concrete,and a longitudinal main crack and some transverse microcracks appear in the concrete slab.Under the action of unidirectional push-out load,the composite shear connector fails due to the penetration of splitting cracks in the concrete slab.Lateral compression increases the shear strength of composite shear connectors,but the biaxial load effect is small when the concrete strength is high and the diameter of the continuous reinforcement is large(shear strength ratio is 1.05).The shear strength of composite shear connector significantly increases with the increase of concrete strength and through reinforcement diameter under biaxial loading.关键词
钢-混组合梁/剪力键/双向荷载/剪切机理/荷载-滑移Key words
steel-concrete composite beam/connector/biaxial load/shear mechanism/load-slip分类
建筑与水利引用本文复制引用
马亚飞,胡涛,章拔超,周彪,王磊,张建仁..双向荷载下组合剪力键的剪切机理及抗剪强度计算模型[J].土木与环境工程学报（中英文）,2025,47(3):171-179,9.基金项目
国家重点研发计划(2021YFB2600900) （2021YFB2600900）
湖南省自然科学基金创新研究群体项目(2020JJ1006) National Key Research and Development Program of China(No.2021YFB2600900) （2020JJ1006）
Science Fund for Creative Research Groups of Hunan Province(No.2020JJ1006) （No.2020JJ1006）
