FRP加固木梁的受弯性能试验研究  

Experimental Study on Flexural Behavior of Timber Beams Strengthened with FRP

作　　者：曹海[1] 刘伟庆[1] 杨会峰[1] 邵劲松[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009

出　　处：《江苏建筑》2009年第4期32-35,共4页Jiangsu Construction

基　　金：国家自然科学基金资助项目(50578075);江苏省建设厅招标项目(JS2005ZB05)

摘　　要：为考察纤维增强复合材料(fiber reinforced plastics/polymer,FRP)对木梁的加固效果,对比分析了3根普通木梁和33根FRP(包括CFRP和GFRP)加固木梁的极限荷载与抗弯刚度等结构性能,并探讨了构件的破坏形态与破坏机理。结果表明:采用FRP对受弯木梁进行加固是有效的,加固的效果与加固的层数、加固层的类型以及加固方式有关。在木梁受拉区设置加固层可有效提高木梁的抗弯承载力,CFRP加固层的加固效果优于GFRP的;木梁受压区设置加固层可有效提高木梁的抗弯承载力,在纯弯区横向设置FRP加固层可增强木梁受压区的性能,有效提高木梁的抗弯承载力,提高的幅度与加固层层数有关;加固层设置于木梁受压区侧部的效果优于设置于木梁受压区顶部。Through experimental work of 3 unstrengthened control timber beams and 33 FRP（CFRP and GFRP） strengthened timber beams,the ultimate load and the bending stiffness of FRP strengthened timber beams were compared with those of unstrengthened control beams, also the failure modes and failure mechanism were discussed. The experimental results have shown that the use of FRP for flexural reinforcement timbers are effective and the effects of reinforcement depend on the number of layers of reinforcement layers and the type of the way. At timbers reinforcement in tension zone settings FRP layer can effectively improve the flexural capacity, CFRP reinforcement layer is better than the GFRP reinforcement;Compression zone settings timbers reinforcement layer can effectively improve the flexural capacity,In the pure bending zone settings FRP transverse reinforcement layer can enhance the performance of compression zone effectively and improve the flexural capacity,the range of reinforcement depends on the number of reinforcement layers;Reinforcement layer setting in the compression zone side is better than the settings in the compression zone at the top of timbers.

关 键 词：木梁 加固 纤维增强复合材料(FRP) 受弯性能 

分 类 号：TU366.2[建筑科学—结构工程] TU317.1