SPF规格材弹性模量概率分布及其力学性能评价  

Probability distribution of MOE and mechanical properties of SPF dimension lumbers

作　　者：王正[1] 杨燕[1] 刘斌[1] 

机构地区：[1]南京林业大学材料科学与工程学院,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2014年第2期157-160,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：2012年江苏省苏北科技发展计划科技型企业技术创新资金项目(BC2012416);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：应用瞬态激振法实测了针叶木规格材(SPF)的弹性模量,并对弹性模量进行了威布尔分布的拟合检验。结果表明:SPF规格材松木试件的弹性模量遵循威布尔分布,应用拟合检验确定的威布尔参数,估算了总体弹性模量均值、标准离差和弹性模量在给定值下的概率。根据GB 5005—2003木结构设计规范及确定的威布尔参数,评价了总体二级SPF规格材松木试件达到二级材Ⅱc的可靠度为95.9%,即推算总体松木试件弹性模量达不到二级材Ⅱc的概率为4.1%。This paper measured MOE of a batch of SPF dimension lumbers by means of transient shock excitation method and applied Weibull distribution to fit the examination using 30 pine test pieces from totality second-class randomly. The result showed that MOE of pine testing lumbers of SPF batch followed the law of Weibull distribution and Weibull param-eters determined by fitting examination, which had estimated the general mean value, standard deviation and probability of MOE at given values. The accuracy of assess was 95？9% according to code for design of timber structures （ GB 5005-2003） and Weibull parameters, when pine test pieces of total second-class SPF dimension lumbers accorded with the standard of second-class, this mean was that the probability was 4？1% when pine test pieces of total SPF dimension lumbers were not up to the standard of second-class Ⅱc .

关 键 词：针叶木规格材 振动法 弹性模量 威布尔分布 力学性能 

分 类 号：S781[农业科学—木材科学与技术]