This paper proposes three new types of connectors adopted in discrete connected new-type precast concrete diaphragms (DCNPD). An experimental investigation of innovated connectors under shear load was conducted to evaluate the failure mode, strain and bearing capacity of joint connections in DCNPD. Based on the experimental results, the hairpin connector (HPC) was selected for simulation verification and further analysis under combined loads to provide crucial information on bearing capacity, ductility, reduction rule, deformation and stiffness in order to reveal its working mechanism. The results indicate that three types of connectors can provide effective connection for slab joints. The ideal fracture failure mode of anchor bar or cover plate is realised in all joint connections. The shear capacity of HPC is weakened by simultaneous tension when it is under combined loads. With the increase of tension-to-shear force ratio, the ductility of HPC is improved, and the shear ductility is relatively better. The evaluation of yield displacement and bearing capacity, degradation law in strength, deformation and stiffness of HPC provides a theoretical basis for the development of joint connection and seismic design of DCNPD, which is vital for the application of DCNPD in precast concrete structures.

中文翻译：

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离散连接新型预制混凝土隔板节点连接面内力学行为研究

本文提出了在离散连接的新型预制混凝土隔板（DCNPD）中采用的三种新型连接器。对剪切载荷下的创新连接器进行了实验研究，以评估 DCNPD 中接头连接的失效模式、应变和承载能力。根据实验结果，选择发夹连接器（HPC）进行联合载荷下的仿真验证和进一步分析，以提供有关承载能力、延性、折减规律、变形和刚度的关键信息，以揭示其工作机制。结果表明，三种类型的连接器可以为板式节点提供有效的连接。锚杆或盖板的理想断裂破坏模式在所有节点连接中均实现。HPC 的抗剪能力在承受联合载荷时会因同时受拉而减弱。随着拉剪力比的增大，HPC的延展性提高，剪切延展性相对较好。对HPC的屈服位移和承载力、强度、变形和刚度的退化规律进行评估，为DCNPD节点连接和抗震设计的发展提供理论依据，这对于DCNPD在预制混凝土结构中的应用至关重要。