## 1 Introduction  
In the development process of assembled buildings, the assembled concrete frame system is more widely used at home and abroad due to its flexibility in architectural space arrangement and high prefabrication rate [1, 2]. However, it is also found that the connection problems of prefabricated structures are prominent at this stage, such as joint treatment, grouting, the connection of beam-column joints, etc., among which the core is the connection of beam-column joints, which directly affects the load-carrying capacity and stability of the seismic performance of the building structure [3, 4, 5]. Assembly frame beam-column connections can be divided into dry connections and wet connections, according to the construction methods, and ductile connections and strong connections according to the connection methods. At present, the joints of prefabricated concrete structures with wet connection methods such as sleeve grouting and laminated concrete in China are relatively mature. There are mature design concepts and design methods, relevant standards have been introduced, and the application range is wider [6; 7]. In the research on the dry connection of frame beam-column joints, domestic and foreign scholars have conducted extensive experimental studies, theoretical analysis, and design optimization. The main methods of dry connection are corbel connection, bolted connection, and welded connection. [PERSON] et al. [8] conducted full-scale seismic tests on the proposed new assembled beam-column joints and compared the results with existing cast-in-place concrete joints. It was found that the new joints connected by bolts were equivalent to cast-in-place joints in seismic performance and energy dissipation performance. On this basis, C80 high-performance concrete and new material filler were proposed to be applied to the beam ends and columns in the joint core area [9; 10; 11; 12]. The theoretical studies and numerical simulations showed that filling with a certain amount of new material can improve the ductility and toughness of the whole structure and enhance its seismic energy dissipation performance. Meanwhile, the wet connection is an important connection method for the assembly of fabricated components. [PERSON] et al. [13; 14; 15; 16; 17] proposed that UHPC new material should be applied to the post-cast parts, and the mechanical properties of wet connection fabricated joints and cast-in-place joints were tested. The test results showed that the application of UHPC material can significantly improve the ductility and toughness of the fabricated structure and enhance its seismic performance. On the other hand, as most of the assembled joints are pre-fabricated in advance in the factory, it not only provides convenience for the functional design of structural components but also makes it possible to dry-connect beam-column joints [18; 19; 20; 21; 22]. To adapt the assembled dry-connection beam-column joints to various working conditions, scholars at home and abroad have studied a variety of dry connection methods. For example, fabricated joints with embedded hook-bolt connectors [23], assembled joints with cross steel plates and bolts [24], embedded profiled steel connection plates [25], and other related embedded connectors [26; 27], etc. [PERSON] et al. [28] proposed a semi-rigid precast beam-column joint with rapid assembly based on bolt connection. These connection schemes have greatly extended the application areas of assembled structures and at the same time played a positive role in the optimal design of assembled structures. At present, researchers have conducted a lot of work on improving the load-bearing capacity and energy dissipation capacity of new joints and have studied connection members with high stiffness for improving the stability of precast concrete structures [29; 30; 31]. Not much research has been carried out on the assembly efficiency and post-disaster repair efficiency of nodes. [PERSON] et al.