比尺对梁式构件动态弹性模量影响的实验研究

Experimental Investigation of Influence of Scale on Dynamic Elastic Modulus of Beam-type Elements

根据梁式构件在大型模拟地震振动台上的实验资料 ,求得 3种不同比尺的石膏纯悬臂梁及加质量块悬臂梁结构的材料前四阶的振型动态弹性模量 (简称动弹模 )和非振型动弹模 .实验结果表明 :振型动弹模随振动阶次的增加而增加 ;非振型动弹模的变化主要发生在从低频 (低于一阶固有频率 )到一阶固有频率这一范围 ,且随频率增加而增加 .几何比尺 (Cl≤ 10 )

Based on the experiment data of beam-type elements on large simulated ground motion shaking table, the first four order modals and no-modal dynamic elastic moduli(DEM) of the elements are obtained for three different scales′ gypsum cantilever with and without block. The results show that the modal DEM increases with order of vibration, and change of the no-modal DEM takes place mainly between first natural frequency and low frequency (lower than the first natural frequency), and the DEM increases with vibration frequency. Scale( C l ≤10) has no obvious effects on the change of the DEM of linear material such as gypsum with frequency.