To address the problems of poor pouring quality and weak bonding at the interface of double-superimposed shear walls, this paper investigates the seismic performance of a thin-walled double-superimposed shear wall structure. One cast-in-place shear wall specimen (SW) and one thin-walled double-superimposed shear wall (DW) were designed and manufactured for low-cycle reversed loading tests. The failure modes, hysteretic behavior, energy dissipation capacity, ductility, and stiffness degradation of the two specimens were compared and analyzed. The results show that both specimens experienced flexural failure. In specimen DW, the semi-embedded longitudinal reinforcement of the concealed column effectively connected with the reinforcement and work together, which verifies the feasibility of the structural design. Compared with specimen SW, specimen DW had a higher bearing capacity and reduced ductility. Its stiffness degradation showed the characteristic of “high initial stiffness-fast degradation rate”. The energy dissipation capacity of the two specimens was similar. The double-superimposed wall demonstrated performance approximately equivalent to cast-in-place, indicating it can meet the engineering requirements in seismic regions.

To address the poor seismic performance and low construction efficiency of prefabricated building structural joints, this study proposes a novel prefabricated concrete column-steel beam joint with steel hoop plate connections. A finite element model of the joint was developed using ABAQUS and validated against full-scale cyclic loading tests. Parametric analysis demonstrated that increasing the steel hoop plate thickness improves joint stiffness and load-bearing capacity, while a higher internal diaphragm thickness (within a practical range) enhances initial stiffness; however, axial compression ratio has minimal influence on these properties. Based on these findings, a preliminary design-stage formula for estimating the joint’s shear capacity was derived.

A novel and efficient prefabricated RC beam-column was proposed, post-pour concrete was used in the joint core area to connect the precast beam and the lower-story precast column, the connection location between the upper and lower-story precast columns was set above the joint core area, and the connection was achieved by welding the steel sleeves pre-embedded in the column ends. One prefabricated joint specimen and one cast-in-place joint specimen were designed, and the quasi-static tests were carried out to analyze their seismic performance. The results indicated that the prefabricated joint exhibited bending failure at the beam end, with the column end remaining intact and only two cracks appearing in the joint core area, which conformed to the “strong column-weak beam” design principle. During the loading process, the prefabricated joint went through three stages: linear, elastic, and failure, with the hysteresis curve being the fullest in the elastic stage, which indicated good energy dissipation performance. Compared with the cast-in-place specimen, the prefabricated joint showed a consistent trend of stiffness degradation, the prefabricated joint exhibited a consistent stiffness degradation trend, its negative peak bearing capacity was 7% lower, and its ductility coefficient was reduced by 10%.

To alleviate the destructive damage caused by strong earthquakes in conventional steel frame structures, this study proposes a novel rocking steel frame structure with spring-supported connections. Utilizing the finite element software SAP2000, an elastoplastic analysis model was established to evaluate the structure’s performance through pushover analysis and dynamic time-history analysis. Additionally, the effects of support constraints, height-to-width ratio, and rigid-body displacement ratio on the seismic behavior of the rocking steel frame structure were investigated. The results demonstrate that, compared to the conventional steel frames, the proposed system exhibits enhanced ductility, along with significantly reduced harmful and residual inter-story drift angles, highlighting its low-damage and self-centering capabilities. Furthermore, within a specific range, increasing the rigid-body displacement ratio improves the structures’s overall seismic resistance.

The connection form of beam-column joints is a key factor influencing the seismic performance of prefabricated building structures. To simultaneously meet seismic performance requirements and enable efficient construction, this paper proposes a novel connection form for prefabricated reinforced concrete beam-column joints with embedded steel sections. A full-scale precast edge-joint specimen and a corresponding cast-in-place edge-joint specimen were fabricated and tested as a control group under pseudo-static loading. The research results show that: the joint exhibited a beam-end plastic hinge failure mode; the load-displacement curve demonstrated favorable fullness, reflecting good ductility and energy dissipation capacity; shear failure was effectively prevented in the joint core region, achieving the "strong joint, weak component" seismic design objective.