The existing R/C structures having uncertain properties are analyzed using the fuzzy sets theory. The uncertain properties are defined by fuzzy values. Each fuzzy value consists of a crisp value and its membership degree. The membership degree is assimilated to the degree of confidence. The degree of confidence is estimated by specific methods. The uncertainty and the fuzziness of the data are estimated by specific measures. They are used to estimate the quality of the data and to find out the influence of the input data uncertainties over the uncertainty of the structural behavior. Fuzzy constitutive laws describe the structure behavior. The structural analysis is performed using a fuzzy algebra, adequate to structural engineering problems. This algebra is implemented in a library of functions for the fuzzy operations of the class FUZZY. The library is built in C++ language, on the principles of the object-oriented programming. During the computation flow, the degrees of confidence of the properties are combined and propagate from the input data until the final results. The method has a broad applicability for the static and dynamic, linear and nonlinear analysis It can be used for the nondeterministic analysis of the R/C structures having uncertain properties. for the improvement of the deterministic methods, or for the development of the case studies for checking the code provisions.

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