摘要
对具有纵向贯穿裂缝的矩形截面木梁采用侧贴纤维增强聚合物布（FRP布）的方式加固。将FRP布视为正交各向异性材料，在组合梁小挠度变形的假定下，建立了侧贴FRP布加固具有纵向贯穿裂缝矩形截面木梁弯曲变形的控制方程；研究了FRP加固简支木梁在跨中集中力作用下的弯曲行为，得到了木梁挠度的解析表达式，在此基础上通过参数分析，考察了材料参数、几何参数、加固方式等对梁弯曲挠度的影响。数值结果表明：当FRP布纤维方向与梁轴线夹角班0°时，CFRP布的加固效果好于GFRP布的加固效果，而当0为10°～15°时，FRP布的加固效果最为显著；当FRP布量纲为一的厚度（FRY布厚度与木梁的宽度之比）β〈0．02、剪切模量（FRP布OXZ方向的剪切模量与木梁弹性模量之比）η〈0．5时，β和η对FRP布加固木梁的挠度有较显著的影响。
The timber beam with longitudinal through split is strengthened with fiber-reinforced polymer(FRP) sheet,and regarding the FRP sheet as an orthotropic material,the governing equations for bending of the timber beam with longitudinal through split strengthened with FRP sheet by lateral bonding is established under the assumption of the infinitesimal deformation of composite beam.Then the bending of the simply supported longitudinal through split timber beam laterally bonded with FRP sheet subjected to a concentrated load at its midpoint is investigated.The analytical expression of the timber beam deflection is obtained,and the parameter study is conducted.Numerical results obtained reveal that when the angle between the fiber direction and the axial line of the beam is 0o,the reinforcement effect of the CFRP is better than that of the GFRP,and when the angle lies between 10o and 15o,the effect of the FRP reinforcement is the most remarkable.Furthermore,for the FRP sheet,when the dimensionless thickness less than 0.02 and dimensionless shear modulus less than 0.5,great influence on the deflection of the FRP-strengthened timber beam can be achieved.
出处
《应用力学学报》
CAS
CSCD
北大核心
2012年第5期516-522,626,共7页
Chinese Journal of Applied Mechanics
基金
国家高技术研究发展计划资助(2009AA032303-2)
关键词
纤维增强复合材料
带裂缝木梁
加固复原
数学模型
弯曲变形
fiber-reinforced polymer,split timber beam,reinforcement and rehabilitation,mathematical model,bending deformation
