论文部分内容阅读
将木梁视为服从标准线性固体本构的黏弹性体,假定纤维增强聚合物(fiber reinforced polymer,FRP)布与木梁紧密粘贴,研究了FRP布加固木梁线性弯曲的蠕变行为.在建立FRP布加固黏弹性矩形截面木梁弯曲变形控制方程的基础上,利用Laplace变换,给出了突加均布载荷作用下FRP布加固简支黏弹性木梁弯曲的解析解.根据相关试验数据,确定了花旗松(Douglas-fir,DF)木梁标准线性固体本构的材料参数,分析了芳纶纤维增强塑料(aramid FRP,AFRP)布含量和梁跨高比等对AFRP布加固简支DF木梁弯曲变形的影响.结果表明:AFRP布加固可有效减小木梁的蠕变挠度;随着DF木梁蠕变的增加,AFRP布加固DF木梁的中性轴逐渐靠近粘贴AFRP布的侧边,且随着DF木梁跨高比或AFRP布含量的提高,AFRP布加固DF木梁的最大压应力和最大拉应力减小.
Considering the wood beam as a viscoelastic body conforming to the standard linear solid constitutive model, the creep behavior of the linear bending of the wooden beam strengthened with FRP cloth is assumed assuming that the fiber reinforced polymer (FRP) cloth is closely attached to the wooden beam. Based on the Laplace transform, the analytical solution to the bending of simply supported visco-elastic visco-elastic wood beams strengthened with FRP sheets is given based on the governing equations of the bending deformation of viscoelastic rectangular section beams strengthened with FRP sheets. According to the relevant experimental data , The material parameters of Douglas-fir (DF) wood linear solid constitutive model were determined. The effects of the aramid FRP (AFRP) cloth content and beam span ratio on the reinforcement of AFRP cloth were analyzed. DF.The results show that the AFRP cloth reinforcement can effectively reduce the creep deflection of the wooden beam. As the creep of the DF wooden beam increases, the neutral axis of the AF wooden beam strengthened by the AFRP cloth gradually approaches the adhesiveness of the AFRP cloth The maximum compressive stress and the maximum tensile stress of the AF wood-beamed CF wood beam decrease with the increase of DF wood beam span ratio or AFRP cloth content.