Qingyu Duan Qiang Wang ^* chunxiao yang ^*

• Shenyang Jianzhu University, Shenyang, Liaoning Province, China

With the large-scale construction of high-rise and super high-rise buildings, structures combining ultra-high strength concrete and steel sections are increasingly applied in practical engineering. Accurately predicting the elastoplastic behavior of frame structures containing steelreinforced ultra-high performance concrete (SRUHPC) components is crucial for assessing the seismic safety and studying the collapse performance of buildings with such components. To expand the application range of the SRC-SFM based on DEM (Discrete Element Method), this paper introduces a UHPC constitutive model based on SRC-SFM, constructing an SFM suitable for SRUHPC components. On this basis, it also achieves the establishment of a comprehensive SRHSC model. The SRUHPC SFM model is further validated through comparisons with the hysteretic performance of SRUHPC components and plane frames of different stories. Comprehensive indicators including hysteretic curves, stress-strain relationships of various fibers at the column base, energy dissipation curves, and stiffness degradation curves prove that SRUHPC-SFM can be used to simulate the hysteretic performance of SRUHPC components and SRUHPC plane frames. This extends the application of DEM in studying the non-linear mechanical properties of structures containing SRUHPC components before collapse, laying a solid foundation for accurate simulation of the entire collapse process of structures containing SRUHPC components using DEM.