|本期目录/Table of Contents|

[1]杨成,岳孔,陆伟东,等.火灾条件下落叶松木材抗弯性能研究[J].南京工业大学学报(自然科学版),2016,38(05):61-67.[doi:10.3969/j.issn.1671-7627.2016.05.010]
 YANG Cheng,YUE Kong,LU Weidong,et al.Flexural behavior of larch wood under fire condition[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2016,38(05):61-67.[doi:10.3969/j.issn.1671-7627.2016.05.010]
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火灾条件下落叶松木材抗弯性能研究()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
38
期数:
2016年05期
页码:
61-67
栏目:
出版日期:
2016-09-28

文章信息/Info

Title:
Flexural behavior of larch wood under fire condition
文章编号:
1671-7627(2016)05-0061-07
作者:
杨成1岳孔1陆伟东1刘伟庆1程秀才2贾翀3
1.南京工业大学 土木工程学院,江苏 南京 211800; 2.南京市产品质量监督检验院,江苏 南京 210091; 3.南京林业大学 材料科学与工程学院,江苏 南京 210037
Author(s):
YANG Cheng1YUE Kong1LU Weidong1LIU Weiqing1CHENG Xiucai2JIA Chong3
1.College of Civil Engineering,Nanjing Tech University,Nanjing 211800,China; 2.Nanjing Institute of Product Quality Inspection,Nanjing 210091,China; 3.College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China
关键词:
落叶松 火灾 抗弯强度 弹性模量
Keywords:
larch fire modulus of rupture modulus of elasticity
分类号:
S781.29
DOI:
10.3969/j.issn.1671-7627.2016.05.010
文献标志码:
A
摘要:
本文以木建筑结构用材——兴安落叶松为研究对象,考虑实际火灾条件的影响,以N2为保护气体,开展了木材炭化温度以下(20~280 ℃)绝氧条件中不同受热时间落叶松木材的抗弯性能试验。结果表明:落叶松木材的密度和含水率随着环境温度的升高而降低,试件质量损失率随着温度的升高而提高; 随着环境温度的升高,落叶松木材的颜色逐渐加深,在20~160 ℃时颜色变化较为缓慢,在190~280 ℃时变化剧烈; 试验范围内,火灾条件中温度(20~280 ℃)对落叶松木材抗弯强度的影响大于受热时间(60、90 和120 min); 落叶松木材的抗弯强度和弹性模量随着温度的升高非单调递减,并对相对抗弯强度进行3次多项式拟合,拟合精度较好。
Abstract:
At present,the mechanical properties reduction of heated wood between the charring layer and the internal normal wood are ignored during fire design of engineered wood based on the timber structure norms at home and abroad.It is convenient for design calculations; however,it leads to overestimate the strength retention of wood member exposed to fire.In this paper,bending tests of larch wood under different heating time and temperature were carried out,the tests were conducted under the protection of nitrogen according to the impact of actual fire conditions.The results showed that the density and moisture content of all specimens decreased,bending strength,modulus of elasticity and mass loss increased as the temperature increased.As the temperature increased,the color of wood became darker slowly at the temperature ranging from 20 ℃ to 160 ℃,and changed rapidly between the 190 ℃ and 280 ℃.Among the factors related to the mechanical properties,the effect of temperatures was greater than the heating time.A third order polynomial model,as a function of the temperature,was used to fit the relative bending strength of the specimens,and the result of fitting was accurate enough.

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备注/Memo

备注/Memo:
收稿日期:2016-02-26
基金项目:国家林业公益性行业科研专项(201304504); 江苏省高校自然科学研究项目(14KJB220001); 江苏省质量技术监督局科技项目(KJ155425)
作者简介:杨成(1991—),男,江苏盱眙人,硕士,主要研究方向为现代木结构; 岳孔(联系人),副研究员,E-mail:yuekong@njtech.edu.cn.
引用本文:杨成,岳孔,陆伟东,等.火灾条件下落叶松木材抗弯性能研究[J].南京工业大学学报(自然科学版),2016,
更新日期/Last Update: 2016-09-20