The randomness in the response of structures is due to two primary factors.One is the randomness in the load,which has been discussed extensively in the past.The other is the randomness associated with structural parameters.To insure reliability of a design,design engineers need to know the effect of the randomness in the structure on the response.In this paper,a practical and effective method to calculate the response statistics,mean values and standard deviations of random structures,is presented.As the a...