You Jieyong, Li Cunsheng, Zhu Yushuai, Zhao Yanheng, Xu Liang, Han Xiaodong, Ge Yuanzhen, Niu Zengcong, Wan Dongbo, Liu Long
China Construction Fifth Bureau Fourth Construction Co., LTD, Luoyang, 471000, China.
Henan Province Engineering Research Center of Material for Reinforcing Concrete Structure & Anyang Engineering Research Center of High ductility Concrete Structure, Anyang Institute of Technology, West Section of Yellow River Avenue, Anyang, 455000, China.
Sci Rep. 2025 Jul 1;15(1):22084. doi: 10.1038/s41598-025-05801-8.
Shaped steel-reinforced concrete (SRCC) is used in engineering applications because of its load resistance and energy absorption properties, but the lack of ductility limits its ability to improve seismic performance. A novel structure-SRCC configured with Engineered Cementitious Composites (ECC) jacket (ESRCC) is proposed for breaking through this limitation and improving the load-bearing capacity and ductility of SRCC. Then, the mechanism of the key design parameters of ESRCC (ECC jacket thickness, rebar ratio, hoop ratio and size of shaped steel) on the mechanical properties is systematically investigated on the basis of the finite element model, focusing on revealing the role of these variables on the failure modes, load-deflection curves and ductility. The results show that the rebar ratio and hoop ratio have a significant effect on the mechanical properties of ESRCC, and the ultimate load capacity is increased by 12.85% when both increase from 0 to 1.84% and 3.3%, respectively. The ECC jacket thickness has a limited impact and is not upgraded by more than 1.5%. The effect of shaped steel size is nonlinear, increasing the shaped steel size within a certain range can improve the load-bearing capacity of the ESRCC, but the ductility of the ESRCC will be degraded when the distance between the shaped steel flange and the concrete surface is reduced. Finally, a prediction formula for calculating the ultimate bearing capacity of ESRCC was proposed. This formula can be applied to ESRCC with varying ECC jacket thicknesses, and the predicted results show relatively small errors. The research provides theoretical support for selecting the optimal ECC jacket thickness in practical engineering applications.
型钢混凝土（SRCC）因其承载能力和能量吸收特性而被应用于工程领域，但缺乏延性限制了其改善抗震性能的能力。为突破这一限制并提高SRCC的承载能力和延性，提出了一种新型结构——配置有工程水泥基复合材料（ECC）外套的型钢混凝土（ESRCC）。然后，基于有限元模型系统研究了ESRCC关键设计参数（ECC外套厚度、配筋率、配箍率和型钢尺寸）对力学性能的影响机制，重点揭示这些变量在破坏模式、荷载-挠度曲线和延性方面的作用。结果表明，配筋率和配箍率对ESRCC的力学性能有显著影响，当二者分别从0增加到1.84%和3.3%时，极限承载力提高了12.85%。ECC外套厚度的影响有限，提升不超过1.5%。型钢尺寸的影响是非线性的，在一定范围内增加型钢尺寸可提高ESRCC的承载能力，但当型钢翼缘与混凝土表面的距离减小时，ESRCC的延性会降低。最后，提出了计算ESRCC极限承载力的预测公式。该公式可应用于不同ECC外套厚度的ESRCC，预测结果误差相对较小。该研究为实际工程应用中选择最佳ECC外套厚度提供了理论支持。
