## 1 Introduction  
With urbanization accelerating, traditional construction techniques cannot meet the current increasing demand for housing. Prefabricated building is considered a major trend for future development because of its good seismic performance, easy construction, low greenhouse gas emissions, and high utilization of building materials [1, 2, 3]. As a type of enclosure system of prefabricated buildings, autoclaved lightweight concrete (ALC or AAC) panels are made of several fine aggregates (cement, sand, gypsum, aluminum powder, etc.) by high temperature and pressure [4, 5]. Many scholars conducted in-depth studies. [PERSON] [6] et al. studied the strength of AAC blocks with different fiber additions. The result shows that the flexural and compressive strengths of the test blocks are increased, especially for the carbon fiber group. [PERSON] et al. [7] investigated the mechanical properties of AAC blocks incorporating graphene. They demonstrate that the addition of graphene brings a significant increase to the compressive and tensile strength and impact resistance of AAC. In addition, other researchers have also attempted to improve the seismic performance of structures by changing material parameters and effective out-of-plane reinforcement techniques. [PERSON] et al. [8] investigated RC-framed infilled wall structures reinforced by polyurethane joints (PUF) or polyurethane-impregnated fiber grids (FRPU). The result shows that its application improves the initial stiffness, base shear, and maintains a high horizontal drift. By using in-plane cyclic shear-compression tests, [PERSON] et al. [9] studied AAC masonry walls with bed-joint (BJR) reinforcement specimens. They show a significant increase in maximum deformation capacity, shear strength, and seismic performance compared to an unreinforced wall. [PERSON] et al. [10] studied the deformation process of in-plane AAC walls with different joint treatments. They find that the specimens reinforced with GFRP show some improvement in deformation, stiffness, and load-carrying capacity. [PERSON] et al. [11] proposed a new innovative fencing system. The results show that its application achieves the required 2% in-plane deformation without cracking and maintains its out-of-plane stability. [PERSON] et al. [12] studied the seismic performance of URM walls reinforced by HDC, which improves the ultimate displacement, energy dissipation, and bearing capacity. [PERSON] et al. [13] studied the seismic performance of AAC infill walls with the addition of curaua fiber-cement composites. The result shows satisfactory post-peak ductility because the energy is not abruptly lost but gradually releases throughout its deflection-softening behavior. To improve the strength and ductility of concrete in seismicloading, antiseismic fabric, especially double-sided reinforcement of expansive glass particle plastering is used by [PERSON] et al. [14]. [PERSON] et al. [15] studied the seismic performance of three different planar RC frames with flexible connections, including U-slot, T-slot, and female and male slots. The test shows that flexible connections exhibit a bare frame-like behavior, protecting the infill wall and optimizing the rigid wall force pattern. The connection between the prefabricated structure and the main structure is also critical. There are differences in the basic mechanical properties of the different connections (such as beam-column joints, laminated slabs, etc.) [16; 17; 18; 19; 20; 21]. However, little research has been performed on the connection of the external AAC panel. The main connection methods are hook head bolt and ADR connectors (as shown in Figure 1). The external hook head bolt is rigidly connected to the ALC panel. The hole will be damaged under seismic loading and increase the risk of overall instability. The ADR connector ensures a flexible connection, but it increases the construction cost.