Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2002.969.974Azer A. Kasimzade102002210Structures with finite dynamic degree of freedom and fuzzy geometrical and Physical parameters are analyzed under earthquake action, membership functions of quality characteristics have been established, deflections of the fuzzy results as ratios of the deterministic are estimated with percents, safety criterion and its estimating is given. Experimental test is made by using orthogonal array Taguchl`s method. For each α cut level the equations of motion are solved using step by step integration in the time domain by the numerical Wilson-θ`s method. Some operations with fuzzy parameters are provided by using extension principle (Zadeh, 1965). Numerical examples are given and the result are explained.]]>Buckeley, J.J.,1992Chen, L. and S.S. Rao,1997Laiimond, B., G. Plessis, T. Tison and P. Level,1999Wadia-Fascetti, S. and B. Gunes,2000Wang, G.Y. and J.P. Ow,1990Zadeh, L.A.,1965Kasimzade, A.A. and A.A. Kasumov,1999