Use of Fuzzy Logic in the Quantification of Dynamic Uncertainties Due to Degradation
 

Sara Wadia-Fascetti
    Assistant Professor, Northeastern University

H. Allison Smith
    Assistant Professor, Stanford University

 

ABSTRACT

Using the principles of fuzzy logic, this study develops a degradation model to predict the potential range in values of structural dynamic parameters over the lifespan of the structure.  Deteriorating fundamental parameters, such as structural stiffness, which contribute to the long-term structural degradation are represented as fuzzy sets and used with the vertex method to predict ranges in the values of higher-level parameters, such as natural frequency.  The degradation model is time dependent and can be used to estimate structural characteristics at any point during the structure's lifespan.  An example is included in which degradation in natural frequency due to joint loosening is estimated over a span of 100 years.
 

Contact Information:

Prof. S. Wadia-Fascetti (swf@neu.edu)
Dept. of Civil & Env. Engineering
Northeastern University
Boston, MA  02115

Reference:

Wadia-Fascetti, S., and Smith, H. A., (1995) “Use of Fuzzy Logic in the Quantification of Dynamic Uncertainties Due to Degradation.” Restructuring:  America and Beyond Proceedings of Structures Congress XIII, edited by Masoud Sanayei, Boston, MA,  pp. 1655-1658, April 1995.

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