Abstract
Yielding of steel can dissipate a substantial amount of energy, which can be used in steel dampers for mitigating seismic effect on engineering structures. However, the accumulation of cyclic plastic deformation of steel due to earthquakes may lead to low-cycle fatigue fractures of steel dampers. Though the accumulated plastic deformation capacity of steel can be increased by employing low-yielding ductile steel, plastic deformation capacity of steel is still limited.
Nevertheless, the plastic deformation demands on steel dampers are various, which depend on their working range of earthquake levels. If steel dampers are required to dissipate energy in the range of earthquakes at both minor and major levels, the accumulated plastic deformation would be too large for steel dampers to accommodate. To solve this problem, the concept of multi-stage steel dampers is proposed.
A multi-stage steel damper is a combination of two or even three steel dampers to effectively work in various ranges of earthquake levels. The working range can be between minor and moderate earthquake levels, between moderate and major earthquake levels, and even between major and mega earthquake levels. Since each steel damper only needs to meet the requirement on a relatively narrow range of working earthquake levels, the demands of accumulated plastic deformation can be easily met.
Based on the concept of multi-stage steel dampers, the multi-stage steel beam-type dampers and brace-type dampers has been developed. The configuration and performance objectives of multi-stage steel beam-type and brace-type dampers are presented and their workability at various earthquake levels are demonstrated with experiments. The effectiveness of application of multi-stage steel beam-type and brace-type dampers in practical projects are also presented in comparison with usage of traditional dampers.
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Li, GQ., Jin, HJ., Pang, MD., Sun, YZ., Hu, DZ., Sun, FF. (2022). Development and Application of Multi-stage Steel Dampers. In: Mazzolani, F.M., Dubina, D., Stratan, A. (eds) Proceedings of the 10th International Conference on Behaviour of Steel Structures in Seismic Areas. STESSA 2022. Lecture Notes in Civil Engineering, vol 262. Springer, Cham. https://doi.org/10.1007/978-3-031-03811-2_5
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