## 1 Introduction
Besides, precast concrete columns with grouted splice sleeve have also been proposed and tested, which have good seismic performance [29]. The original purpose of the German superimposed assembly system is to achieve building energy efficiency. The prefabricated floor and the wallboard are semi-manufactured products made in the factory, with longitudinal reinforcement and lattice reinforcement according to the structural requirements. A styrene foam board with high compressive strength, low water absorption, and good insulation is set outside or inside the wall. After the semi-manufactured products are transported to the construction site and lifted in place, concrete is poured between the wallboards which act as templates. Some necessary reinforcements will also be set at the joint. Such systems have the advantages of simple production, low cost and excellent quality, hence, are widely used in Germany and have significant energy saving effect. However, as Germany is not located in an earthquake-prone area, the seismic design of such systems is not considered. In order to better develop the superimposed technology, it has been improved for some related seismic performance studies. For example, there is a sandwich concrete wall whose middle layer is a polystyrene sheet, and is sprayed with thin concrete layers on its surface during construction [30]. [PERSON] et al. [31] found that the seismic performance of this structure was comparable to that of cast-in-place concrete, and the stiffness and the strength of the building made of such material under dynamic excitation appears quite superior with respect to those expected from the results of previous pseudo-static cyclic tests conducted on simple specimens [32; 33; 34; 35]. Another superimposed concrete wall is made of prefabricated wall panels and cast-in-place components. Prefabricated wallboard is made of two prefabricated panels and lattice reinforcements. After being installed in place, concrete is poured in the middle of the two layers, bearing the vertical horizontal force together. Through the test [36; 37; 38; 39; 40], it can be seen that the prefabricated part of this superimposed wall is well combined with the cast-in-place part, and the energy dissipation capacity is similar to that of the whole cast-in-place wall, which proves that the seismic performance is close to the traditional cast-in-place wall. In the 1990s, superimposed technology was introduced to Japan, and it was widely used in floor and maintenance wall systems. The finishing can be set on the outer surface of the prefabricated wallboard at the factory. After installation at the construction site, it is used as the wall's template on the outer side, with reinforcement placed on the inner side. The template is set on the other side of the wall, and such a semi-prefabricated shear wall is completed after pouring the concrete. The prefabricated wallboard works with the cast-in-place part through the reinforcement on the inner side, which can reduce the amount of sand and gravel construction, speed up the construction, improve the construction quality, and greatly reduce the amount of the template used. Japan's tests, engineering practices, and theoretical analyses have shown that the performance of such semi-prefabricated laminated structures meet safety requirements and are in line with the relevant Japanese regulations. In recent years, the laminated reinforced concrete shear wall structure has been introduced into China. Although application of the wall structure has been in Japan for more than 20 years, most of it is used as floor and maintenance walls of framed structures. The question of whether it can be used as a load-bearing wall in high-rise shear wall structures is still lacking in adequate research and evidence. In view of this situation, there is an urgent need for a series of targeted experimental research work on the laminated shear wall structure to accumulate information, and gradually develop and improve the corresponding design, construction guidelines, and application standards.