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针对基于形状记忆合金(SMA)的自复位摩擦耗能支撑,提出了简化分析模型,研究了其在往复荷载作用下的滞回性能.首先通过理论推导,得出了往复荷载作用下自复位摩擦耗能支撑的力-位移曲线,提出了简化的滞回模型,然后通过参数分析研究了各参数对其滞回性能的影响.结果表明:自复位摩擦耗能支撑在卸载后存在一定的残余位移,其大小仅与阻尼器元件摩擦力及SMA元件奥氏体弹性刚度有关;自复位摩擦耗能支撑的滞回性能可采用修正的FS(Flag-shaped)模型来描述;SMA元件屈服力及耗能参数对自复位摩擦耗能支撑的滞回性能影响较大,奥氏体弹性刚度及屈服后刚度系数影响较小;增加阻尼器元件的摩擦力,可显著增强自复位摩擦耗能支撑的耗能能力,但会产生残余位移.
Aiming at the self-restoring friction energy dissipation support based on shape memory alloy (SMA), a simplified analytical model is proposed and its hysteretic behavior under reciprocating load is studied.Firstly, through theoretical deduction, the self-restoring friction The simplified hysteresis model is proposed based on the force-displacement curve of the energy-dissipating support, and the influence of each parameter on its hysteretic behavior is studied through parametric analysis. The results show that there is some residual displacement after self-restoring friction energy dissipation support , The size of which is only related to the frictional force of the damper element and the austenite elastic stiffness of the SMA element; the hysteretic behavior of the self-restoring friction dissipating support can be described by a modified FS (Flag-shaped) model; the yield strength and the loss of the SMA element The energy parameter has a great influence on the hysteretic behavior of self-restoring frictional energy dissipating brace, and the influence of austenite elastic stiffness and post-yield stiffness coefficient is small. Increasing the frictional force of the damper element can significantly increase the energy consumption of self-restoring frictional energy dissipating brace Ability, but will produce residual displacement.