带腰架结构的自由振动研究

Free-vibration of waist structures

提出由三个基本部分组合而成的分析模型,考虑了内核质量、腰架质量和外围护墙质量的影响,利用传递矩阵方法,对带腰架结构进行动力研究,分析了结构的质量分布及各结构参数的变化对结构动力性态的影响。研究表明,当腰架位置高于0.4H时,外围护墙质量、腰架质量对自振频率的影响较大,减轻外围护墙和腰架的质量,结构的自振频率增大,刚度提高;最佳腰架位置(使自振频率最大)随外围护墙质量、腰架质量的增加而降低,其变化范围在0.4H～0.6H之间,与静态分析中顶端位移最小的腰架位置颇为接近。

Analyses the influence of structural mass distribution and structural parameters on structural dynamic behavior of waist structure and concludes that the influence of structural mass distribution on the natural frequency must been taken into account when the location of the waist structure is higher than0.4H;the natural frequency and structural stiffness will be improved with the decrease in struc-tural mass;the optimum location of waist structure to maximize the natural frequency varies between0.4H～0.6H,and decreases with the increase in structural mass.