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新型三重鋼管防屈曲耗能支撐的力學性能

Mechanical properties of a new type of triple-steel tube buckling-restrained brace

  • 摘要: 基于在大跨網架結構中的應用,對目前的三重鋼管防屈曲耗能支撐進行改進,設計了一種新型支撐,并對該支撐考慮初始缺陷下的力學性能進行了理論分析.根據理論分析,設計了四組不同的支撐,利用ABAQUS有限元軟件模擬分析了在拉壓循環荷載作用下支撐強度比對其力學性能的影響,包括連接段應力狀態、滯回耗能能力和核心管屈曲破壞模式.研究結果表明:該新型耗能支撐結構布置可行,設計方法合理,強度比是影響支撐力學性能的重要參數,在強度比合理范圍內,支撐具有良好的滯回耗能性能;在軸向循環荷載作用下,內外套管約束作用明顯,核心管破壞模式為多波小幅屈曲破壞,變形穩定,滿足防屈曲支撐設計要求.

     

    Abstract: Based on the application of long-span space truss structures, a new type of triple-steel tube buckling-restrained brace was proposed by improving and redesigning current triple-steel tube buckling-restrained braces. The mechanical properties of the brace were analyzed in consideration of initial imperfection. According to this analysis, 4 groups of braces were designed and the effect of strength ratio on the mechanical properties, including the stress state of connection parts, hysteretic behavior, and the failure mode of the core tube, were studied under tension-compression cyclic loading using the ABAQUS software. It is shown that the new structure configuration is feasible and the design method is reasonable. Strength ratio is the key parameter affecting the mechanical properties, and within a reasonable range, the hysteretic performance is well. Under the axial cyclic loading, the effect of inner and outer bushing constraints is obvious, the failure mode of the core tube is multiple-wave small buckling, and the deformation is stably. So the new triple steel tube buckling-restrained brace meets the requirements of design.

     

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