A Response Profile Approach to Damage Diagnosis
Although the problem of engineering structures subjected to damage has been studied extensively in the past few years, it is still an important and challenging task to accurately detect the position and size of damage. In the present paper, a novel approach determining the locating and the severity of damage using the response profile of load process is developed via the structural concept of influence line. Based on the simple beam theory, the analytical response profile lines (RPLs) and its first sensitivity, location sensitivity index of the simply supported beam are derived, and the relationship between the damage factor α and the extent of damage is further discussed. Next, the numerical study demonstrates that the abrupt changes in the response profile lines are just at the damage zone and hence the approach can be used to locate the damage and even multiple-damage position. The interesting result is also found that the magnitude of the location sensitivity index monotonically increases with the increasing extent of damage, which is very similar to the findings of the curvature modeshape method and RPLs of different measurement points can simultaneously identify the same damage position, which greatly increases measurement efficiency. Finally, the model experiments are carried out to validate the theoretical study and compare with numerical findings. The conclusion is that the numerical results agree almostly with the experimental findings and the new approach is based on multi-point excitation, one (multi)-point measurement.Both of the analytical and experimental studies show that the new method with very high precision, provides an authentic basis for damage diagnosis and even safety evaluation. These features indicate that as a potential method of diagnosing damage, it has significant engineering application value and a promising future.
Guangwu Tang Jingbo Liaoa Yan Zhao Xiaona Kou
State Key Laboratory of Bridge Engineering Structural Dynamics,Chongqing Communications Research & D State Key Laboratory of Bridge Engineering Structural Dynamics,Chongqing Communications Research & D State Key Laboratory of Bridge Engineering Structural Dynamics,Chongqing Communications Research & D
国际会议
第六届国际振动工程会议(The 6th International Conference on Vibration Engineering)(ICVE’ 2008)
大连
英文
2008-06-04（万方平台首次上网日期，不代表论文的发表时间）