readme.txt

非线性有限元程序

Program: NONSAP

Title: Static and Dynamic Response of Nonlinear Systems

Developer: K.-J. Bathe, E. L. Wilson and R. H. Iding,
Department of Civil Engineering, University of California, 
Berkeley 1974

Category: Nonlinear Structural

Platform: CDC,Scope,FTN4 (60 bit single precision);
          IBM,VM/CMS,Fortran4H (double precision);
          Fujitsu VP

Reference: Bathe, K-J., E. L. Wilson and R. H. Iding,
"NONSAP - A Structural Analysis Program for Static and 
Dynamic Response of Nonlinear Systems," Structural 
Engineering Lab, Report No. UCB/SESM-74/3, Department of 
Civil Engineering, University of California, Berkeley, 
California, February 1974.

Bathe, K-J., H. Ozdemir, and E.L. Wilson, "Static and Dynamic 
Geometric and Material Nonlinear Analysis", Structural Engineering 
Lab, Report No. UCB/SESM-74/4, Department of Civil Engineering, 
University of California, Berkeley, California, February 1974.

Summary: NONSAP is a finite element structural analysis
program for the static and dynamic response of nonlinear 
systems. The program is an in-core solver. The system 
response is calculated using an incremental solution of the 
equation of equilibrium with the Wilson-theta or Newmark 
time integration scheme. Before the time integration is 
carried out, the constant structure matrices, namely the 
linear effective stiffness matrix, the linear stiffness, 
mass and damping matrices, whichever applicable, and the 
load vectors are assembled and stored on low speed storage. 
During the step-by-step solution the linear effective 
stiffness matrix is updated for the nonlinearities            
in the system. Therefore, only the nonlinearities are dealt 
with in the time integration. The structural systems to be 
analyzed may be composed of the following element types: (a) 
3-D truss element; (b) 2-D plane stress and plane strain 
element; (c) 2-D axisymmetric shell or solid element; and 
(d) 3-D thick shell element. Nonlinearities may be due to 
large displacements, large strains, and nonlinear            
material behavior. The following material descriptions are 
available: For Truss Elements (a) linear elastic and (b) 
nonlinear elastic; For 2-D Elements (a) isotropic linear 
elastic, (b) orthotropic linear elastic, (c) Mooney-Rivlin 
material, (d) elastic-plastic materials (von Mises or 
Drucker-Prager yield conditions), (e) variable tangent 
moduli model, and (f) curve description model (with tension            
cut-off); and For 3-D Elements (a) isotropic linear elastic 
and (b) curve description model.