双向荷载下组合剪力键的剪切机理及抗剪强度计算模型

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中图分类号：TU398 文献标志码：A 文章编号：2096-6717（2025）03-0171-09

Shear mechanism and shear strength calculation of composite shearconnectorsunderbiaxial load

MA Yafei，HU Tao，ZHANG Bachao，ZHOU Biao，WANG Lei， ZHANG Jianren （School of Civil and Environmental Engineering，Changsha Universityof Science & Technology，Changsha 410114， P.R.China）

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 loadand 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 failsdue to the penetration of spliting cracks in the concrete slab.Lateral compression increases the shear strength of composite shear connectors，but the biaxial load effect is smallwhen the concrete strength is high and the diameter of the continuous reinforcement is large （shear strength ratio is1.O5）.The shear strength of composite shear connector significantly increases with the increase of concrete strength and through reinforcement diameter under biaxial loading.

Keywords： steel-concrete composite beam；connector; biaxial load; shear mechanism; load-slip

钢-混组合梁由钢主梁和混凝土桥面板组成，发挥了钢材抗拉和混凝土抗压的力学性能[1-3]。（剩余13000字）