装配式槽钢组合梁中开孔钢板连接件力学性能

为研究新型装配式双拼槽钢-混凝土组合梁中开孔钢板剪力连接件(PSP剪力连接件)的力学性能，设计7组标准试件并开展推出试验，对比分析不同参数PSP剪力连接件的受剪承载力和破坏模式。利用ABAQUS非线性有限元模型对PSP剪力连接件的破坏模式和受力机制进行数值模拟，并与试验结果对比验证计算结果的可靠性。在此基础上，进一步分析开孔钢板厚度、开孔直径、混凝土强度、穿孔钢筋及连接件间距对PSP剪力连接件力学性能的影响。结果表明：除10 mm厚度的PSP剪力连接件外，所有4 mm与6 mm厚度的PSP剪力连接件均发生明显弯曲变形，试件破坏时连接件周围混凝土均出现斜向裂缝；开孔直径和穿孔钢筋对受剪承载力和抗剪刚度影响较小，而增加开孔钢板厚度、混凝土强度能提高剪力连接件受剪承载力和抗剪刚度；对于双排PSP剪力连接件，增大连接件间距能够显著提高单排PSP剪力连接件平均承载力，当间距为250 mm时，单排平均承载力达到单个PSP剪力连接件的91.2%。根据试验及有限元荷载滑移曲线提出装配式双拼槽钢-混凝土组合梁中单个PSP连接件荷载滑移曲线计算公式，为装配式双拼槽钢混组合梁的设计提供参考。

Mechanical properties of perforated steel plate connectors in prefabricated channel steel-concrete composite beams

To study the mechanical properties of perforated steel plate (PSP) shear connectors in prefabricated double-channel steel-concrete composite beams, seven groups of standard specimens were designed and push-out tests were conducted to compare and analyze the shear capacity and failure modes of PSP shear connectors with different parameters. The ABAQUS nonlinear finite element model was developed to numerically simulate the failure mode and force mechanism of PSP shear connectors, and the reliability of the finite element results was verified by comparing with the experimental results. On this basis, further analysis is conducted on the effects of the thickness of the perforated steel plate, the diameter of the hole, the strength of the concrete, the perforated reinforcement and the spacing between the connectors on the mechanical properties of PSP shear connectors. The results showed that, except for the 10 mm thick PSP shear connectors, all PSP shear connectors with the thicknesses of 4 mm and 6 mm underwent obvious bending deformation, and oblique cracks appeared in the concrete around the connectors when all specimens were failed.The diameter of the hole and the perforated reinforcement had little effect on the shear capacity and shear stiffness, while increasing the thickness of the perforated steel plate and concrete strength could improve the shear capacity and shear stiffness of PSP shear connectors. For double-row PSP shear connectors, increasing the spacing between the connectors could significantly improve the average bearing capacity of single-row PSP shear connectors, and when the spacing was 250 mm, the average shear capacity of single-row PSP shear connectors reached 91.2% of that of a single PSP connector. Finally, an equation for the calculation of the load-slip curve of a single PSP shear connector in prefabricated double-channel steel-concrete composite beams was proposed based on the experiment and finite element load-slip curve providing a reference for the design of prefabricated double-channel steel-concrete composite beams.