Abstract
The premature end failure of the traditional hollow steel pipe damper (HSPD) greatly affects its energy dissipation performance. This paper proposes a novel hollow steel pipe damper (i.e. end-reinforced steel pipe damper, ESPD), which consists of an energy dissipation steel pipe, two inner short steel pipes for strengthening the end of ESPD, and two connecting plates. To study the effectiveness of end-reinforced structure and investigate the mechanical performance of ESPD, one HSPD and three ESPDs specimens with different lengths of inner short pipe are fabricated and subjected to low-frequency cyclic loading. To investigate the influence of the reinforced steel pipe on the mechanical properties of ESPD, numerical analyses are conducted. Results indicate that end-reinforced with short inner pipe is a simple and feasible measure to avoid premature end failure of HSPD. Compared to HSPD, ESPDs own a superior energy dissipation ability and ductility. The reinforcement thickness ratio of 1.67 to 2, and the reinforcement length ratio larger than 0.47 are suggested in designing ESPD.
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