Seismic behavior of concrete columns with ends transformed via perforated H-shaped steel and engineered cementitious composite

• Published in: Soil dynamics and earthquake engineering (1984) 2023-02, Vol.165, p.107725, Article 107725
• Main Authors: Bai, Chong, Tian, Li-min, Yang, Ping, Li, Tian-ji
• Format: Article
• Language: English
• Subjects: Concrete column; ECC; Numerical simulation; Perforated H-Shaped steel; Seismic behavior; Shear capacity
• ISSN: 0267-7261; 1879-341X
• DOI: 10.1016/j.soildyn.2022.107725

A novel structural detail is proposed to strengthen or shift the plastic hinge regions of concrete column-footing connections by using perforated H-shaped steel and engineered cementitious composites (ECC) in this study. Two transformed concrete columns and a normal concrete column were tested under a constant axial load and quasi-static reversed cyclic load to explore their seismically important features, including failure modes, hysteretic response, energy dissipation, stiffness degradation, and strain. Furthermore, a numerical study was also conducted to investigate the influences of critical parameters on seismic performance, and a formula for predicting the shear capacity of concrete columns is proposed. The results reveal that the seismic performance of concrete columns can be improved by embedding perforated H-shaped steel and using ECC at each end, and the plastic hinge can be relocated away from the column ends. The finite-element results agreed well with the experimental results. A high shear-span ratio adversely affects the seismic performance of the transformed concrete columns. An increase in the axial load ratios and H-steel insertion depth can enhance the load-carrying capacity of the models. •The plastic hinge regions are strengthened or shifted.•The perforated H-shaped steel is used in precast concrete components.•Using ECC to improve the ductility of components.•The influence of critical parameters is analyzed.•The formula for predicting the shear capacity is proposed.