Accession Number : ADA188372

Title :   A Numerical Study of Automated Dynamic Relaxation for Nonlinear Static Tensioned Structures.

Descriptive Note : Final rept. Oct 84-Sep 86,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s) : Shugar, T A

PDF Url : ADA188372

Report Date : Oct 1987

Pagination or Media Count : 82

Abstract : This research addresses the lack of a robust structural analysis computational procedure for determining the initial equilibrium configuration and prestress state of tensioned structures. Three nonlinear iterative solution algorithms were considered: 1) the Newton algorithm; 2) the modified Newton algorithm; and 3) the automated dynamic relaxation (ADR) algorithm. A large set of small cable test problems was designed to evaluate the robustness of each algorithm. In these test problems, the starting conditions were designed purposely to be onerous to test the ability of the algorithms to seek the correct static equilibrium position form rather arbitrary starting configurations. The ADR algorithm proved to be more robust than the Newton algorithm, and the modified Newton algorithm was entirely unsatisfactory for this class of problems. Keywords: Finite element technology; Nonlinear static solution algorithms; Dynamic relaxation method; Cable systems; Geometric nonlinearity; Structural analysis.

Descriptors :   *CABLES, *FINITE ELEMENT ANALYSIS, *STRUCTURAL ANALYSIS, *UNDERWATER STRUCTURES, ALGORITHMS, COMPUTATIONS, DYNAMICS, EQUILIBRIUM(GENERAL), GEOMETRY, NONLINEAR SYSTEMS, NUMERICAL ANALYSIS, RELAXATION, SOLUTIONS(GENERAL), STATICS

Subject Categories : Submarine Engineering
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE