Accession Number : ADA261003


Title :   Joint FLexibility Effects on the Dynamic Response of Structures. Part 2. Stochastic Analysis


Descriptive Note : Final rept.


Corporate Author : PUERTO RICO UNIV MAYAGUEZ DEPT OF CIVIL ENGINEERING


Personal Author(s) : Suarez, Luis E ; Matheu, Enrique E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261003.pdf


Report Date : Dec 1992


Pagination or Media Count : 66


Abstract : The objective of this study is to quantify the effect of flexible connections with random stiffness on the modal properties and dynamic response of structures. Since the mass and stiffness matrices contain random parameters, the modal decomposition solution of the equations of motion lead to a random eigenvalue problem. A second order perturbation technique is used for the solution the random eigenproblem. Closed form expressions for the mean and variance of the natural frequencies and vibration modes are provided. The response of systems with random parameters subjected to deterministic loads is examined next beginning with single degree of freedom systems. When standard perturbation methods are applied to calculate the statistics of the response, the expressions obtained become non uniform as time grows. A detailed discussion about the cause of the problem is presented. A new formulation based on the method of multiple scales used for nonlinear systems is proposed to overcome the problem. The response analysis is extended to multi degree of freedom systems. Conclusions and recommendations for further research are presented.... Flexible connections, Random eigenvalue problems, Perturbation techniques, Stochastic finite elements.


Descriptors :   *STOCHASTIC PROCESSES , *DYNAMIC RESPONSE , *STRUCTURAL RESPONSE , *FLEXIBLE STRUCTURES , FREQUENCY , EQUATIONS OF MOTION , PARAMETERS , STATISTICS , EIGENVALUES , TIME , NONLINEAR SYSTEMS , DECOMPOSITION , MEAN , PERTURBATIONS , STANDARDS , RESONANT FREQUENCY , PROBABILITY DENSITY FUNCTIONS , MOTION , STIFFNESS , MASS , DYNAMICS , VIBRATION


Subject Categories : Statistics and Probability
      Structural Engineering and Building Technology


Distribution Statement : APPROVED FOR PUBLIC RELEASE