China is a large country that produces coal and iron, and has wastes of fly ash and silica fume discharged from coal-fired power plants and ferroalloy plants, respectively. With rapid industrialization, the total amount of fly ash is increasing year by year and the annual output is expected to reach 400 million tons by 2020 [
1,
2]. Fly ash and silica fume were once considered as industrial by-products that not only lead to environmental pollution, but also cause secondary pollution such as land occupation. However, Golewski [
3] pointed out that from the perspective of economic and sustainable developments, the use of fly ash and silica fume as cementing materials instead of cement will bring many benefits. At present, reactive powder concrete has evolved into a comparatively mature phase and has become popular in various areas such as municipal works, buildings, roads and bridges [
4,
5,
6,
7,
8,
9,
10]. Nonetheless, there is little research on self-compacting concrete (SCC) of double-doped silica fume-fly ash, and only Yang Zhiwei [
11] and Bao Mingxuan [
12] have done research on compressive strength, chloride ion penetration resistance and sulfate resistance of SCC of double-doped silica fume-fly ash. With little ongoing research, there is considerable room for the study of SCC of double silica fume and fly ash. SCC is a concrete with high fluidity, uniformity and stability, not needing external vibration during pouring, and can flow and fill space under the action of self-weight [
13]. In fact, the employing of fly ash and silica fume not only change the chemical properties of the concrete but also to some extent the mechanical properties, especially the internal friction [
14,
15,
16,
17]. The SCC improves the quality and speed of construction compared to ordinary concrete, reduces the noise in the process of pouring concrete, improves the living environment of the surrounding residents and realizes the labor-saving pouring of concrete. At the same time, it also improves and solves the problem of difficult vibration of concrete filled steel tubes during construction [
18,
19,
20,
21,
22]. The concrete-filled steel tube (CFST) has gradually replaced the traditional reinforced concrete shear wall which has poor seismic performance and is prone to brittle failure due to its advantages of high-quality rapid constructions. At present, Xu et al. [
23] have carried out low-cycle reversed load tests on 15 steel reinforced concrete T-shaped shear walls, and not only analyzed the seismic failure mechanism of steel reinforced concrete T-shaped shear walls, but also the influence of shear span ratio, axial compression ratio and other parameters on the seismic performance. Their results show that the seismic performance of steel reinforced concrete T-shaped shear walls is better than that of traditional reinforced short-leg shear walls. Shang et al. [
24] designed a full-scale steel short-leg shear wall, and analyzed the bearing capacity, failure process and failure characteristics of the short-leg shear wall. They reveal that the bearing capacity of the short-leg shear wall is greatly improved when the steel is configured, and the steel ratio and the length-width ratio of the appropriate steel short-leg wall has an obvious effect on the bearing capacity of the short-leg shear wall. Fang et al. [
25,
26] designed and completed the axial compression tests of 18 high strength concrete filled steel tube shear walls, and analyzed the mechanical mechanism, failure mode, denaturation capacity and bearing capacity of such members under axial compression. The test results show that with an increase in concrete volume stirrup ratio between steel tubes, the ultimate compressive strain of concrete will also increase. The stirrup effect of steel tubes on concrete will become more obvious, and the deformation and bearing capacities of members will also boost accordingly. Jiang [
27] designed 20 specimens of high-strength concrete-filled steel tube shear walls, and carried out axial compression tests and non-linear finite element analysis to study their axial compression mechanical properties. The results show that the simple superposition method is more appropriate to calculate the bearing capacity of high-strength concrete-filled steel tube shear walls.
The above-mentioned research shows that the steel-concrete composite combination has good bearing capacity and seismic performance, but at present, there is little research on the assembled multi-cavity steel tube self-compacting concrete shear wall and there is a lack of understanding on the mechanical properties of such components. The failure mechanism and mechanical performance of the multi-cavity steel tube shear wall and the reinforced concrete shear wall are obviously different, and if calculated according to the reinforced concrete shear wall in actual structural engineering, the calculated structure will be conservative. Although the working mechanisms of the steel plate-concrete shear wall, concrete-filled steel tube shear wall and multi-cavity steel tube shear wall is similar, there are differences in structural forms and cross-sectional dimensions. Therefore, the mechanical properties of multi-cavity steel tube shear wall cannot be directly calculated with reference to the relevant theories of steel plate-concrete shear wall and steel tube shear wall. For this reason, it is necessary to systematically study the failure mechanism and mechanical performance of multi-cavity steel tube SCC shear wall and put forward relevant calculation theories and design methods. Relying on the renovation project of Hongxinyuan shanty in Hongguang Town, and to provide reference for engineering design, the relevant conclusions are drawn by the method of combining experimental research and finite element analysis.