用环刚度法评价圆竹径向抗压力学性能  

Radial compression mechanical properties of bamboo-culm by ring stiffness

作　　者：张文福 江泽慧 王戈 程海涛 张丹 

机构地区：[1]国际竹藤中心

出　　处：《北京林业大学学报》2013年第1期119-122,共4页Journal of Beijing Forestry University

基　　金：林业公益性行业科研专项重大项目(201204701);农业科技成果转化资金项目(2009GB24320467)

摘　　要：根据圆竹在实际中的应用情况,本文提出用环刚度法作为圆竹径向抗压力学性能评价的主要指标。通过试验,确定了圆竹环刚度测试试件的长度等于试件的直径,测得毛竹的环刚度在80～180kN/m2之间,远远大于QB/T1916—2004中给出的最高级(SN16)。竹材在高度方向上的环刚度从基部到顶部呈增大趋势,4年生毛竹的环刚度优于6年生毛竹的环刚度。竹节可以有效提高圆竹的径向承载能力,带有竹节圆竹的环刚度是无竹节圆竹的2.30倍。在圆竹上加喉箍可以增加其径向破坏应变,而圆竹打孔使得其径向抗压力学性能随孔径的增加呈下降趋势。环刚度法具有测试迅速、可操作性强等特点,可以用于圆竹径向抗压力学性能的评价。In this paper, Moso bamboo is the main object to study its radial compression mechanical properties of bamboo-culm by ring stiffness method. It was found that the optimum length of samples was its outer diameter. The ring stiffness of Moso bamboo was 80-180 kN/m2, far greater than QB/T 1916-2004 standard given in the SN16 level. Ring stiffness increased with stem height from bottom to top, but declined after 4-year-old. Bamboo joint can improve the radial compression of bamboo-culm,and that with bamboo joint was about 2.30 times of without. Using hose clamps can improve the strain of bamboo-culm, but the holes reduce its radial compression performance with the increase of hole diameter. Therefore, it is inferred that ring stiffness can be used as a novel and reliable method for assessing the radial compression mechanical properties of bamboo-culm.

关 键 词：环刚度 圆竹 径向抗压力学性能 

分 类 号：TU759[建筑科学—建筑技术科学]