作　　者： ; ;

机构地区： 汕头大学工学院土木工程系

出　　处： 《华中科技大学学报（自然科学版）》 2011年第3期47-50,共4页

摘　　要： 为更合理分析增强纤维复合材料(FRP)加固混凝土梁剪弯段的剥离破坏,提出了一个基于加固梁两裂缝间梁段的空间有限元模型,并用圣维南原理和数值方法证实其合理性和可靠性;进而以FRP应力、FRP层数、剪跨比、FRP-混凝土粘结滑移本构关系和梁段长度作为影响因素,对此模型做非线性有限元计算分析.结果表明:FRP应力和层数对剥离荷载有显著影响,数值计算与多个既有实验结果基本一致. In order to analyze the debonding failure of the shear-flexure zone of FRP （fiber reinforced plastics） strengthened reinforced concrete beams, a simple three dimensional nonlinear finite element model, based on a ＂beam segment＂ between two cracks of a strengthened beam, was built. An appli- cation of Saint-Venant principle and a numerical study were carried out to prove the rationality and reliability of the proposed model. Based on this model, the debonding load of FRP strengthened beams, under the influence of differenct stress levels of FRP, layers of FRP, shear-span ratio, FRP-concrete constitutive laws and length of beam segment, were analyzed by nonlinear finite element method. The numerical analysis indicate that the debonding failure is induced mainly by FRP stress and the number of FRP layers. There is a substantial agreement between our numerical calculation and existing experimental results.

关 键 词： 纤维复合材料 混凝土梁 剥离 应力分析 有限元

领　　域： [建筑科学]