###### Abstract
More notably, this structural form has shown unique damage control and rapid repair capabilities in recent earthquake disasters; for example, during the 2016 Ecuador earthquake, the RCS structure demonstrated good seismic performance, with minimal inter-story displacement angles, and the key nodes were quickly repaired after the quake [4]. The new energy-consuming RCS building used in the 2023 Turkey earthquake demonstrated its excellent seismic capacity [5]. In terms of research methods, the ABAQUS nonlinear finite element analysis platform, with its mature concrete damage plasticity model (CDP) and multiple-contact algorithm, provides an effective tool for solving the problem of simulating RCS nodes in a complex stress state [6]. At the same time, the latest developments in multi-scale modeling technology (such as the embedded reinforcement constitutive model) have significantly improved the simulation accuracy of the longitudinal reinforcement bonding slip effect, which is also crucial for the analysis of the core force of nodes. However, the current construction industry still faces severe challenges, such as high energy consumption and high-level pollution, caused by traditional cast-in-place construction. Although prefabricated, modular RCS structures are considered a solution by many scholars, the key technical bottleneck lies in the reliability of the node connections. Extensive research has been conducted both domestically and internationally; this includes early studies on the beam-through and column-through node methods by Japanese scholars. The scholars [PERSON] and [PERSON] in the United States conducted low-cycle repeated loading tests on several proportional RCS composite frame edge joints to investigate the effects of joint construction and other factors on the seismic performance of RCS edge joints [7,8]. The Chinese researcher [PERSON] and others employed experiments and finite element simulation to analyze the steel-concrete composite joints of concrete-filled steel tube columns and steel beams under the influence of floor assembly [9]. [PERSON] et al. in China conducted experimental simulation and seismic performance research on the single-sided bolted connection of a hollow core steel tube, a concrete column, and a column node considering the floor [10]. These represent the advanced research and outstanding discoveries of experts and scholars in the field of civil engineering throughout history, guiding us to explore and learn even more diligently. However, there are two significant limitations in analysis and research: First, over half of the existing studies focus on optimizing the construction of beam-column joints, while severely neglecting the critical factor of floor slab interaction effects. The experimental data from [PERSON] et al. show that considering the floor slab interaction effect increases the peak load-bearing capacity of beam mechanisms by more than 40% compared to that of specimens without floor slabs, and increases the peak load-bearing capacity of catenary mechanisms by nearly 50% [11]. Secondly, a systematic understanding of the stiffness degradation mechanism and the failure mode of semi-rigid joints with high-strength bolt connections under seismic action is still lacking. [PERSON] et al. conducted a nonlinear static analysis to investigate the seismic performance of RCS frames, highlighting the influence of node deformation on the overall structural behavior [12]. Recent vibration test results have shown that when a floor slab is involved, the rate of bolt preload loss increases more significantly compared to conditions without a floor slab. This time-varying characteristic has a significant effect on the seismic performance of the structure [13]. In response to the aforementioned critical issues, this paper innovatively establishes a refined analysis model for RCS nodes that considers the composite effect of floor slabs.