CFRP增强单板层积材梁的抗弯性能研究  

Study on Bending Behaviors of CFRP Reinforced LVL Beams

作　　者：袁凯宇 沈玉蓉[1,2] 盛宝璐 周爱萍[1] Yuan Kai-yu;Shen Yu-rong;Sheng Bao-lu;Zhou Ai-ping(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;Jangsu Co-innovative Center for Efficient Application of Forestry Resources,Nanjing 210037,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]南京林业大学江苏省林业资源高效利用协同创新中心,江苏南京210037

出　　处：《工程抗震与加固改造》2018年第6期10-16,44,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(51578291);林业科学技术成果国家级推广项目([2015] 21号);江苏省研究生科研与创新计划项目(KYCX17_0832)

摘　　要：针对单板层积材(LVL)受到制造工艺及木材自身缺陷影响,力学性能不稳定的问题,需通过不同材料对单板层积材进行加固,以提高其力学性能。采用碳纤维布(CFRP)增强单板层积材梁,通过对单板层积材力学性能与受弯构件的试验研究,分析材料非线性应力-应变关系以及构件的破坏模式、破坏机理,建立受弯构件的极限承载力计算公式,通过分析试验数据,验证公式的正确性。结果表明:单层碳纤维增强梁的抗弯极限承载力平均提高了17.78%;CFRP增强单板层积材梁极限承载力计算公式精度较高,能够较好地预测加固梁的抗弯性能。In view of the problem that the LVL(laminated veneer lumber) is affected by the manufacturing process and the wood′s own defects and the mechanical property is not stable, so LVL needs to be reinforced by different materials. CFRP is use to strengthen LVL beams, and the experimental analysis is carried out. Nonlinear stress-strain relationship of material and the component failure mode and failure mechanism are researched through the test of LVL mechanical properties and the bending component. Eventually a ultimate bearing capacity calculation model of bending component is established.The result proves that the model is accurate enough to predict the bending properties of LVL beams reinforced by FRP. The results show that the ultimate bearing capacity of single-layer carbon fiber reinforced beam increases by 17.78% on average and the calculation formula of ultimate bearing capacity of CFRP reinforced LVL beam has higher accuracy and better prediction of flexural strength.

关 键 词：单板层积材 碳纤维布 静力试验 抗弯承载力 

分 类 号：TU531[建筑科学—建筑技术科学]