Seismic performance study of a novel steel truss energy dissipation coupling beam

• Published in: Journal of constructional steel research 2024-05, Vol.216, p.108556, Article 108556
• Main Authors: Liu, Ye, Ma, Zhibei, Lv, Xinlei
• Format: Article
• Language: English
• Subjects: Buckling-restrained damper; Coupling beams; Friction energy dissipation; Theoretical analysis
• ISSN: 0143-974X; 1873-5983
• DOI: 10.1016/j.jcsr.2024.108556

To reduce the inter-story drift ratio and floor acceleration of coupled shear walls, a novel replaceable steel truss energy dissipation coupling beam was proposed. The coupling beam comprises two buckling-restrained dampers with additional friction energy dissipation (BFDs) as diagonal web braces, two chords, and connectors, which is able to transform the shear deformation of the coupling beam into the axial deformation of diagonal web braces. A series of quasistatic loading tests were carried out on coupled steel truss energy dissipation beams to discuss the effects of the coupling beam height, damper type, section height of the large yield segment, bolt torque, and slot hole length on the seismic performance of the coupling beam. The experimental results indicate that specimens S2, S3, and S4 with the same yield segment height exhibited similar hysteresis performance. Although the friction energy dissipation device was applied to specimen S4, the hysteresis performance did not improve due to the dampers' end rotation failure. Increasing the large yield segment height from 5 mm to 8 mm resulted in a significant increase in the maximum shear force, energy dissipation, and fatigue life. Increasing the slot hole length led to a degradation of the aforementioned properties. Furthermore, a theoretical analysis of the forces acting on the end of the hinged dampers was conducted based on the end-rotation failure characteristic of the dampers, and a verification formula for the fracture of the outer tube at the end was proposed. •Proposal of a novel steel truss energy dissipation coupling beam.•Quasi-static tests on six steel truss energy dissipation coupling beams.•A theoretical analysis was conducted on the forces at the ends of the hinged dampers in coupling beams.