<正>研究了A、B两种不同结构的竹材增强单板层积材在1～500mm/min的不同加载速度下的静曲强度及动态弯曲强度。结果表明：两种结构的静曲强度均随着加载速度的加快呈增加的趋势；加载速度较低时，A型结构的静曲强度比B型结构的大；加载速度超过150mm/min后，B型结构的静曲强度大干A型结构的。两种结构的动态弯曲强度均比各自的静曲强度大，且A型结构的动态弯曲强度明显大于B型结构的。

Carbonization mechanism of bamboo was investigated by means of Electron Spin Resonance (ESR). The results show: (1) Around 600 *C is a key carbonization temperature for bamboo. Below 600C, the first stage, bamboo mainly experiences the thermal decomposition. Above 600C, the second one, the conduction of bamboo charcoal is changed into semiconductor from insulator. Obviously silicon effect is observed in the transition stage. (2)Thermal decomposition of bamboo is mainly concerned with radicals from the decomposition of hemicellulose, cellulose, and lignin in bamboo. (3)Moisture and the carbonized atmosphere have effects on the properties and relaxation mechanism of spin centers.