自复位摩擦耗能支撑试验研究与有限元分析

EXPERIMENTAL STUDY AND FINITE ELEMENT ANALYSIS OF SELF-CENTERING FRICTION ENERGY DISSIPATIVE BRACE

  • 摘要: 以可恢复功能结构为背景,提出了一种由弹簧和楔形块组成的新型自复位摩擦耗能支撑。介绍了该支撑的构造形式和工作原理,并对支撑整体及各部件受力性能进行了力学分析。通过低周往复加载试验和有限元数值分析验证该装置构造设计的可行性,并对其滞回特性、特征荷载、特征刚度和耗能能力进行了分析。试验结果表明,装配弹簧和楔形块组的自复位耗能支撑滞回曲线呈典型的“旗形”特征,经历多次循环荷载作用后几乎无残余变形,具有良好的复位性能,且支撑工作性能稳定。有限元仿真分析表明,试件S1屈服荷载试验值与模拟值最大相差27%,最大荷载、恢复力荷载和加卸载刚度误差均小于10%;其余试件的特征荷载与刚度误差均小于18%。数值分析结果与试验结果较为接近,该ABAQUS有限元模型可有效反映自复位耗能支撑的工作特征。

     

    Abstract: A novel self-centering friction energy dissipation brace composed of spring and wedge block is proposed by the grounds of the background of recoverable functional structures. The structural form and working principle of the brace were introduced, and the mechanical properties of the whole brace and its components were expounded. The feasibility of the structural design of the device was verified by cyclic tests and by finite element analysis, and its hysteretic characteristics, characteristic stiffness, characteristic load, and energy dissipation performance were compared and analyzed. The results show that the hysteretic curve of the self-resetting energy dissipation support based on the combination of spring and wedge block is a typical "flag shape", and that there is almost no residual deformation after multiple cyclic loads. Therefore, it has good self-resetting performance and stable working performance. The simulation analysis shows that the maximum difference between the test and simulated value of the yield load of specimen S1 is 27 %, and that the error of the maximum load, the restoring force load, and the stiffness is less than 10 %. The characteristic load and stiffness errors of the S2 and S3 specimens are less than 18 %. The numerical analysis results are in a good agreement with the experimental results. The ABAQUS finite element model can effectively reflect the working characteristics of the self-centering energy dissipation brace.

     

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