摘要
木结构使用功能变更或使用荷载增加均可能导致木梁受弯承载力不足,需采用措施进行加固。共进行了6根木梁采用竹片加固的对比试验研究,其中3根为对比试件,3根为粘贴竹片加固木梁试件。研究结果表明:粘贴竹片加固木梁受弯承载力可提高48.0%～83.1%,平均提高69.5%;同时破坏位移亦有所增加。加固木梁跨中截面仍基本符合平截面假定;在相同荷载作用下,加固木梁受拉边缘拉应变和受压边缘压应变明显小于对比试件;不同位置竹片随荷载增加时的应变变化基本一致,且应变值相近。粘贴竹片加固木梁是一种低碳高效的加固技术。
Many timber beams may require strengthening due to either the changing of usage or an increase of loading.This paper reported an experiment in which six timber beams were tested,including three reference unstrengthened timber beams and three timber beams strengthened with bamboo strips.The test results showed that the ultimate flexural strength of timber beams increases by 48.0%-83.1% after strengthened by a few externally bonded small bamboo strips.The stiffness of the strengthened beams also increases significantly.The strain distributions along the height of the strengthened beams at middle-span are nearly linear during the whole loading process,that is,a plan section remained almost plan.The strains in the bamboo strips at different position across the width on the tensile face of the beams are very close.This study showed that strengthening timber beams with bamboo strips is a very promising low-carbon and effective technique.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2012年第1期36-42,共7页
Journal of Sichuan University (Engineering Science Edition)
基金
上海市工程结构新技术重点实验室开放课题(2010-KF02)
上海市科委青年科技启明星跟踪计划资助项目(11QH1402100)
国家"十一五"科技支撑计划资助项目(2006BAJ03A10-02)
关键词
木梁
竹片
加固
受弯承载力
timber beams
bamboo strips
strengthening
bending strength
