水分对木质工字梁翼缘/腹板接口性能的影响研究  

Influence of Moisture on Flange-Web Joint Properties of Wood I-Beam

作　　者：李军伟 

机构地区：[1]云南林业职业技术学院,云南昆明650224

出　　处：《西部林业科学》2015年第2期80-86,共7页Journal of West China Forestry Science

基　　金：2011年云南省科技厅应用基础研究计划项目(2011FZ307);2014年云南林业职业技术学院科研项目(KY201401)

摘　　要：为研究水分对木质工字梁(IB)翼缘/腹板接口力学性能及尺寸稳定性的影响,通过单因素试验,检测不同含水率下IB翼缘/腹板接口的垂向承载能力、胶合性能、以及抗劈裂性能。结果表明,IB的综合性纤维饱和点只有25%左右;含水率从8.9%提高到25%的接口的承压能力下降了47.2%,含水率从25%提高到53%的接口的承压能力仅下降了0.6%;水分对IB翼缘和腹板尺寸变化的影响是水分影响接口承载能力的间接因素;吸湿后接口的承载能力并不能恢复到吸湿前的初始水平;解吸至8.9%含水率的IB接口的承载能力比吸湿前同等含水率的IB接口低了17.8%。In order to analyze influence of moisture on flange-web joint properties and dimensional stability of wood I-Beam,based on single factor experiment,vertical bearing capacity,bonding quality and anti-separation capacity of flange-web joint of wood IB under different moisture content（ MC） were checked. The results indicated that：the comprehensive fiber saturation point（ FSP） of IB was only about 25 %; the bearing capacity of the joint declined 47. 2 %,when the moisture content（ MC） increased from 8. 9 % to 25 %; the bearing capacity of the joint declined only 0. 6 %,when the moisture content increased from 25 % to 53 %. The moisture influence on the flange and web dimension change was indirect factor of the moisture influence on properties of IB joint. After wet absorption,the carrying capacity could not go back to the initial level before the wet absorption; the bearing capacity of the joint desorption to MC 8. 9 % was 17. 8 % lower than that was equal MC before the wet absorption.

关 键 词：木质工字梁 翼缘/腹板接口 水分 

分 类 号：TU366.2[建筑科学—结构工程]