新型两阶段屈曲约束支撑滞回性能试验研究

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中图分类号：TU391;TU352.1 文献标志码：A 文章编号：2096-6717（2025）04-0131-09

Experimental study on hysteretic behavior of a new two-stage buckling-restrained brace

YUAN Tao，SUN Tongfei，LIU Ye，DAI Kaoshan，ZHU Zheming （College of Architecture and Environment，Sichuan University，Chengdu 6lOo65，P.R.China）

Abstract： A novel two-stage buckling-restrained brace （TS-BRB） has been proposed to enhance the performance of conventional buckling-restrained braces （BRB），in particular to address the problem that conventional BRB cannot provide lateral resistance and energy disipation capacity to the structure after failure under the action of major-after shocks.The energy disipation unit of the TS-BRB consists of three Q235 steel plates in series with a tapered cross-section along the longitudinal axis.The energy disspation section in the middle plays the role of energy dissipation first during the earthquake，and if this section breaks，the limiting slot in the restraint unit ensures that the rest of the energy dissipation section keps Working，giving the TSBRB a higher energy dissipation capacity than conventional BRB.The slip distance of the TS-BRB is limited by varying the length of the limit slot，enabling the brace to meet the requirements of structural damping design.

Testresults demonstrate that the hysteresis curve of the TS-BRB is saturated and the shape of the hysteresis curve is consistent with theoretical expectations.The TS-BRB exhibits an obvious two-stage energy dissipation characteristic，with the end energy disipation section continuing to operate after the middle energy dissipation section breaks. The additional accumulated energy dissipation after fracture is 138.41% of that before the fracture.The TS-BRB provides a solution to the problem ofconventional BRBs losing load-bearing and energydissipation capacity immediately after fracture and offers greater energy disspation reserves for the structure. Finally，a numerical model was established in ABAQUS，which demonstrates that the hysteretic curve of the numerical simulation agrees well with that of the experiment.

Keywords：buckling-restrained brace （BRB）；damper；energy disipation unit； structural damping design; seismic-capacity reserve; experimental study

近年来，地震灾害频发，主震后常伴随着多次余震，且大部分主、余震间隔较短，无法在主震后对结构进行及时修缮，从而造成结构损伤显著增加。（剩余15274字）