SMA预拉杆式自定心屈曲约束支撑的滞回性能分析

发布时间：2018-03-30 21:16

本文选题：屈曲约束支撑　切入点：自定心　出处：《东南大学学报(自然科学版)》2014年04期

【摘要】：基于屈曲约束支撑(BRB)的流变模型和形状记忆合金(SMA)的分段线性本构模型,建立了可用于分析SMA预拉杆式自定心屈曲约束支撑(SMA-SC-BRB)滞回性能的流变模型和控制方程.然后,运用流变分析方法对一种新型的SMA-SC-BRB构件进行数值模拟,通过对比可知基于流变模型的模拟结果与文献试验结果吻合较好.最后,利用该流变模型对SMA-SC-BRB的滞回性能进行参数分析.结果表明:当初始预张力超过奥氏体相变的结束应力时,其变化对支撑的滞回性能影响较小;增加SMA杆的截面面积,能同时提高支撑的自定心效果和耗能能力;随着核心板截面面积的增加,支撑耗能能力增强,但自定心能力减弱;提高SMA杆的温度能有效提升支撑的自定心能力.
[Abstract]:Based on the rheological model of buckle-constrained brace and the piecewise linear constitutive model of shape memory alloy (SMA), a rheological model and governing equation for the hysteretic properties of SMA self-centered buckling braced bar are established.Then, a new type of SMA-SC-BRB component is simulated by rheological analysis method, and the simulation results based on rheological model are in good agreement with the experimental results.Finally, the rheological model is used to analyze the hysteretic performance of SMA-SC-BRB.The results show that when the initial pretension exceeds the end stress of austenitic transformation, the change of the hysteretic properties of the braces has little effect on the hysteretic properties of the brace, and increasing the cross-section area of the SMA rod can simultaneously improve the self-centring effect and the energy dissipation ability of the brace.With the increase of the cross-section area of the core plate, the energy dissipation capacity of the support increases, but the self-centring ability weakens, and the self-centering ability of the support can be effectively enhanced by increasing the temperature of the SMA rod.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：国家自然科学基金资助项目(51208095) 中央高校基本科研业务费专项资金资助项目(3205003203) 江苏省“青蓝工程”资助项目
【分类号】：TU352.1

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