Accession Number : ADP000036

Title :   Optimum Structural Design under Dynamic Forces with Uncertainties,

Corporate Author : TOKYO UNIV (JAPAN)

Personal Author(s) : Matsui,Kunihito ; Yamamoto,Kazujuki ; Kikuta,Yukio ; Niinobe,Yasuo

Report Date : 1981

Pagination or Media Count : 8

Abstract : Optimization algorithm is presented on a structure which sustains a time dependent force from an indefinite direction. Stresses and displacements are given by parametric forms of both time and direction of force. The direction is treated as uncertainty and is called environmental parameter here. To compute stresses and displacements, equations of motion are formulated based on finite element method with consistent mass matrix and solved by modal analysis. As example problems three truss structures are considered: one is plane truss and the other two are space trusses. A time dependent force is given by sine function, hence all members of the structures undergo from tensile state to compressive state. Numerical results are presented to demonstrate the validity of the algorithm and the dynamic characteristics of the problems.

Descriptors :   *Structural engineering, *Optimization, *Structural mechanics, *Dynamic loads, *Algorithms, Structural analysis, Structural response, Structures, Stresses, Displacement, Time dependence, Orientation(Direction), Parametric analysis, Equations of motion, Finite element analysis, Matrices(Mathematics), Trusses, Tensile properties, Compressive properties

Distribution Statement : APPROVED FOR PUBLIC RELEASE