Culm Form Structure and Physico-mechanical Properties of Neosinocalamus affinisin Growth Process

Culm form structure and main physico-mechanical properties of Neosinocalamus affinis in growth process planted in Lushan,Sichuan were determined and analyzed.The results showed that the internode length and culm diameter increased rapidly with the bamboo forest age before 3 years,then the internode lengh increased slowly and the culm diameter remained relatively stable with the bamboo forest age from 3 to 5 years.When the bamboo forest age was 3-year-old,the average internode length,culm diameter and bamboo wall thickness all reached the utilized level(37.99 cm,32.94 mm,3.46 mm respectively).The values of the basic density,compression strength parallel to grain,shear strength parallel to grain were maximum at the age of 3 years,and they were 0.570 g/cm3,69.475 Mpa,18.833 Mpa respectively,while the maximum value of the radial and tangential shrinking ratio were at age of 1 year,0.339 and 0.330 respectively.The values of physico-mechanical properties were minimum at the bamboo culm age of 2 years.When the bamboo culm was 3-year-old,the physical-mechanical properties satisfied the demand of structural material.