Search

• A new metallic damper with bolted and replaceable steel strip fuses was proposed. • The steel strips can be easily adjusted or replaced after damper failure without affecting the connecting parts. • The primary configuration design of steel strip was provided through theoretical derivation. • The seismic performance of proposed fuse strips was evaluated with cyclic tests and numerical simulations. • The steel strips exerted satisfied energy dissipation ability with pump hysteretic loops. In this study, a high efficiency metallic damper with replaceable steel strips and the adjustable construction is proposed for framed structures. The proposed damper uses bolted steel strips as the energy dissipation fuses, which can be adjusted or replaced after failure without affecting the connecting part. The steel strips participate in the load bearing and energy dissipation through an in-plane bending mechanism. In addition, to exert the load bearing and achieve the potential plasticity fully, the steel strips are desired to yield simultaneously and dissipate energy throughout the entire section. In this paper, the primary configuration design method was provided through a theoretical derivation. Further, the nonlinear performance of the proposed fuse strips was evaluated through a series of quasi-static cyclic tests. The influence of the configuration dimensions was investigated through the experimental study and corresponding finite element analyses. The results indicate that the strips successfully exert their potential energy dissipation with pump hysteresis loops. The fuse strips can better participate in the energy dissipation through bending-dominated working mode, and the bending moment strength of the steel strip is mainly controlled based on the width of the central region. The configuration of the transition region greatly affects the failure mode, the plasticity distribution, and the deformation capability. Based on the test data and the numerical simulation investigations, some primary design guidance for the fuse steel strips is suggested. [ABSTRACT FROM AUTHOR]

This paper aims to utilize a novel steel strip damper to enhance seismic resilience of high-rise steel frame in high seismic intensity regions. The developed damper is composed of external casing, internal casing and steel strip fuses dissipating seismic energy via bending-dominated deformation throughout the entire section, which is convenient for post-earthquake replacement. A series of cyclic loading tests have shown the damper's good energy dissipation capacity with features of stable and full hysteretic loops. A numerical model for the damper is proposed and validated by the experimental results. Then a 20-story steel frame is adopted as the representative building and retrofitted using a design procedure based on the stiffness and displacement demands. Nonlinear dynamic analysis considering damper failure is performed to evaluate seismic responses of the steel frames. And incremental dynamic analysis is employed to discuss the seismic fragility. Finally, seismic losses of the steel frames are assessed through the story-based loss estimation method in which the demolition-related economic losses are included. The analyses indicate that the presented damper can obviously mitigate the roof displacement, inter-story drift, plastic damage and soft story deformation mechanism; the damper-fused frame has much lower probability to collapse; the expected total losses, expected annual losses and expected life-cycle losses are significantly decreased by retrofitting with the novel dampers. A novel steel strip damper is developed to enhance seismic resilience of high-rise steel frame in high seismic intensity regions. Dynamic responses, seismic fragility and seismic losses of the steel frames are assessed. Unlabelled Image • A novel steel strip damper is developed to enhance seismic resilience of high-rise steel frame in high seismic intensity regions. • A numerical model for the damper is proposed and validated by the test results. • The damper can obviously mitigate the dynamic responses and structural damages. • The damper can significantly reduce the expected total losses, expected annual losses and expected life-cycle losses. [ABSTRACT FROM AUTHOR]