Research on Seismic Mechanical Characteristics of Multi-Story Frame Structures in Prefabricated Buildings

As an important structural form of prefabricated buildings, multi-story frame structures are mainly composed of vertically load-bearing frame columns and horizontally connected beams, featuring good structural stability and strong seismic resistance. Compared with the traditional cast-in-place reinforced concrete frame structure, the core feature of the prefabricated frame lies in that its structural components are prefabricated in the factory and then transported to the site to be assembled into an integral structure through specific connection techniques. This revolutionary change in construction methods, while bringing about improvements in efficiency and quality, has also profoundly altered the force transmission mechanism and failure mode of structures. The key to its seismic performance is largely determined by the performance of the connection nodes between prefabricated components, especially the beam-column nodes. This paper focuses on the seismic mechanical characteristics of multi-story frame structures in prefabricated buildings. Through numerical simulation, the mechanical response features of multi-story frame structures under seismic loads are systematically analyzed. Two different strength grades of concrete show similar trends in bearing capacity and deformation capacity. When the axial compression ratio increases, the bearing capacity and yield displacement of the structure are smaller. When the yield strength of longitudinal reinforcing bars increases, the structure has a higher bearing capacity, initial stiffness and greater yield displacement. It has a stronger adaptability when plastic deformation occurs. Structures with a lower reinforcement ratio have a lower bearing capacity and, as the load increases, the rate at which the bearing capacity decreases is faster.