【摘要】 根据实验资料求得混凝土加质量块悬臂梁结构、三种不同比尺的石膏纯悬臂梁及石膏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,且混凝土悬臂梁增加更为明显;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.几何缩尺(G_l≤10)对像石膏这样的线弹性材料的动弹模变化规律基本没有影响.更多还原

【Abstract】 Based on the experimental data, the first four order modal and non-modal dynamicmoduli of elasticity for a concrete cantilever with a block and gypsum cantilevers to three differentscales with and without a block are presented. It is observed that the modal modulus increaseswith order of vibration, and the increase is more obvious for the concrete cantilever than for thegypsum cantilever. The change of the non-modal modulus takes place mainly between lowfrequency (lower than first natural frequency) and the first natural frequency, and the non-modalmodulus increases with increasing vibration frequency. Scale(Cl≤10) has no obvious effect onthe law of the dynamic modulus of linear material such as gypsum, which changes withfrequency.更多还原