摘要
应用扩展有限元法(Extended Finite Element Method,XFEM)建立了碳纤维增强复合材料(Carbon Fiber Reinforced Polymer,CFRP)加固H型钢梁的有限元模型。用CFRP布加固无损伤H型钢梁试验结果进行了比较分析和胶层损伤开裂模型的参数验证,然后,应用该方法系统分析了CFRP布加固有损伤H型钢梁胶层界面的应力分布和开裂损伤情况,并进行了参数的比较分析。分析结果表明,扩展有限元法在CFRP加固带损伤H型钢梁问题方面具有较好的精度,其避免了网格重剖分的问题,也可以模拟出裂纹扩展的路径。最后,在此模型基础上,研究了CFRP布有效粘结长度和胶层界面应力等参数的变化规律。
A finite element model for H-shape steel beams strengthened with CFRP are given out on the basis of extended finite element method（XFEM） which was used in the glue interfacial crack analysis. Ex-periments of steel beams without crack were used for accuracy verification of the XFEM model and the pa-rameters analysis of the crack model. On this basis of the verifications lots of analysis for the glue interfa-cial stress of H-shaped steel beam strengthened with CFRP have been done by using the proposed proce-dure just before. All the computing results were compared by changing the model parameters. The results demonstrate that XFEM model is sufficiently accurate for the analysis of CFRP strengthened H-Shape steel beams with initial crack, The simulation procedure can be carried out without remeshing,and can also de- scribe the crack＇s debonding path accurately. At last the changing rules of the model＇s parameters, such as the effective bonding length of the CFRP and the adhesive interfacial stress etc., are presented in de-tails.
出处
《力学季刊》
CSCD
北大核心
2012年第4期649-656,共8页
Chinese Quarterly of Mechanics
基金
国家"十二五"科技支撑计划(2012BAJ06B02)资助
