چكيده به لاتين
During the serviceability of a structure, it would experience a variety of damages bringing either partial or significant adverse effects on its performance. Thus, Structural Health Monitoring (SHM) methods play a vital role in determining the location as well as the severity of damages in order to keep the structures both stable and safe. In this regard, researchers have put a great amount of effort into proposing methods through which not only would the location of damages be spotted, but their severities would be also quantified.
This paper is mainly aimed at evaluation of model updating method, specifically objective functions and optimization algorithms, for damage quantification and localization of structures. More specifically, the conventional model updating method will be assessed for following problems, for each of which new solution will be presented. I) firstly, the model updating method will be examined for large truss structures, which will lead to proposing new two-step method composed of wavelet and model updating method to reduce the computational cost. II) Secondly, the method will be investigated for the structures on which the strain gage will be installed after damage has occurred. For this purpose, new methodology based on pseudo stain will be established. III) Thirdly, the efficiency of model updating method will be assessed when the uncertainty related to material and geometry are involved in the problem. In this respect, a new probabilistic method based on Monte-Carlo simulation is proposed. IV) Lastly, the model updating method is evaluated in time-domain, and its weaknesses are revealed. In order to tackle these inefficiencies, new regularization method is suggested. In all of the above mentioned methods, dynamic modal data and time-history data are recruited, a number of numerical examples are considered. Finally, according the results, all of the objective dunctions and optimization algorithms proposed so far can be employed in the process and play insignifinat role in achieve the desirable results, but, interestingly, what paly the most critical role is the employing felicitous strategy depending on the size of structure and the domain in which the computations will be done.
Keywords:
Damage Detection, Time-domain, and Frequency-domain, model updating method, probabilistic modeling, and Regularization method.
