Seismic performance of semi-precast composite columns with bolted end-plate connections to footing

• Published in: Engineering structures 2022-05, Vol.259, p.114174, Article 114174
• Main Authors: Kim, Chang-Soo, Jo, Woo-Bin, Baek, Seon-Woo, Hwang, Hyeon-Jong
• Format: Article
• Language: English
• Subjects: Bolted end-plate connection; Bolted joints; Building codes; Composite column; Composite columns; Connectors; Design analysis; End plates; Energy dissipation; Lateral displacement; Manufacturability; Numerical analysis; Numerical prediction; Perforated shear connector; Quasi-static; Seismic activity; Seismic response; Semi-precast; Stiffness
• ISSN: 0141-0296; 1873-7323
• DOI: 10.1016/j.engstruct.2022.114174

•Proposal of semi-precast composite columns.•Full-scale mockup testing and quasi-static testing for verification.•Discussion of numerical analysis and design for better application. To improve manufacturability in factories, constructability on-site, and structural performance at ultimate states, a new method for semi-precast composite columns was developed using corner steel angles and internal moulds. To verify the proposed method, full-scale mockup testing and quasi-static testing were performed for five column specimens with bolted end-plate connections to the footing. Test parameters included joint details and shear connectors. The test results showed that, although a monolithic column specimen exhibited better performance, overall, the semi-precast composite columns with the connections also showed satisfactory behavior in terms of lateral strength, stiffness, displacement capacity, and energy dissipation. The test results were compared with the predictions by numerical analysis and current design codes assuming a fully rigid joint and full composite action. The numerical analysis results and calculated design strength agreed well with the test results, which implies that current design methods are applicable to the design of the proposed column method.