CFRP加固含凹痕缺陷的T形管节点静力性能研究

A Study on the Static Behavior of CFRP-strengthened Tubular T-joints with Dent Defects

通过对现有的碳纤维复合材料(CFRP)加固T形管节点试验进行有限元模拟,并得到试验验证之后,将该种建模方法用于CFRP加固含凹痕缺陷的T形管节点研究,考察了CFRP对含凹痕缺陷的T形管节点加固以及修复的有效性。采用ABAQUS软件研究了含凹痕缺陷T形管节点在未经CFRP加固和采用CFRP加固后两种情况下的静力性能差异。研究结果表明:由于凹痕的出现,T形管节点的刚度和极限承载力均会产生下降,且不同尺寸的凹痕对管节点的刚度和承载力的影响不相同,凹痕的范围越大、深度越深,节点的刚度和极限承载力下降越明显。分别采用缠绕5层和10层的CFRP对含凹痕缺陷的T形管节点进行加固时,其极限承载力分别提高了16.3%和26.8%。采用CFRP加固后T形管节点的极限承载力可高于不含凹痕缺陷的未加固管节点的承载力,说明CFRP对于加固含凹痕T形管节点是有效的。

Based on finite element simulation on reported experimental tests of tubular T-joints strengthened by CFRP,the finite element model is verified through compared with test results.Then the verified finite element model is used to analyze the effectiveness of using CFRP to strengthen and repair tubular T-joints with initial dent defects.Through finite element analysis using software ABAQUS,the static behavior of dented tubular T-joints without and with CFRP reinforcement is studied.The results indicate that the stiffness and the load carrying capacity of tubular T-joints decrease due to dent defects.Such effect of dent defect varies with different dent size.The stiffness and load carrying capacity of tubular T-joints reduce significantly with more dent areas and larger dent depth.After CFRP reinforcement with 5layers and 10layers respectively,the load carrying capacity of a tubular T-joint can be increased by 16.3%and 26.8%respectively.The load carrying capacity of CFRP-strengthened tubular T-joints with dent defects may be higher than that of the corresponding T-joints without dent and CFRP reinforcement,which indicates that CFRP can improve the static behavior of tubular T-joints with dent defect effectively.