Accession Number : ADA190692

Title :   An Evaluation of Numerical Algorithms for the Nonlinear Dynamic Analysis of Large Soil Structure Systems.

Descriptive Note : Final rept. Oct 86-Sep 87,

Corporate Author : CALIFORNIA UNIV SANTA BARBARA

Personal Author(s) : Bayo, Eduardo

PDF Url : ADA190692

Report Date : Dec 1987

Pagination or Media Count : 24

Abstract : The 6.1 Structural Modeling Program at the Naval Civil Engineering Laboratory at Port Hueneme has as a main objective to develop analysis algorithms for the nonlinear analysis of drydocks and other large geotechnical-structural systems. The 6.2 Nonlinear Structural Analysis Program is aimed at implementing those algorithms into a special purpose finite element analysis program that will allow a 3 dimensional nonlinear dynamic analysis of the large structural systems under earthquake and blast type of excitations. This report contins a review and evaluation of these algorithms to assess their applicability towards the 6.2 Program. The issues covered include: reduced modal methods for nonlinear dynamic problems, contact and friction finite element techniques, combination of finite element and recursive boundary element methods, validation of bounding surface plasticity models for saturated cohesive soils and, finally, linear fracture mechanics for concrete. This work is initiated with an exposition of the currently available numerical methods for the solution of the soil-structure interaction problems in the time and frequency domains. Directions are given as to which of the available methods seem to be more applicable for the problem at hand. In particular, complete and substructure methods in the time domain are presented as the most convenient ones. In view of these algorithms the work done under the 6.1 Program is reviewed and evaluated.

Descriptors :   *SOIL DYNAMICS, *ALGORITHMS, *NONLINEAR ANALYSIS, CONCRETE, DRYDOCKS, EARTHQUAKES, FINITE ELEMENT ANALYSIS, FRACTURE(MECHANICS), INTERACTIONS, NUMERICAL METHODS AND PROCEDURES, PLASTIC PROPERTIES, TIME DOMAIN, THREE DIMENSIONAL, BLAST, COMPUTER PROGRAMS, TIME DEPENDENCE, ELASTIC PROPERTIES, KINEMATICS, HYPOTHESES, SATURATION

Subject Categories : Soil Mechanics
      Numerical Mathematics
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE