PSR-0388 CARES.

1. NAME OR DESIGNATION OF PROGRAM:  CARES 1.0 & CARES 1.2.

3. DESCRIPTION OF PROGRAM OR FUNCTION

CARES1.2, Computer Analysis for Rapid Evaluation of Structures, was developed for NRC staff use to determine the validity and accuracy of the analysis methods used by various utilities for structural safety evaluations of nuclear power plants. CARES1.2 is organized in a modular format with the basic modules of the system performing static, seismic, and nonlinear analysis. In this release, only the seismic module is implemented. This module defines the design seismic criteria at a given site, evaluates the free-field motion, and computes the structural response and floor response spectra including soil-structure interaction. The eight options in CARES1.2 currently are: a general manager for the seismic module, deconvolution analysis, structural data preparation for soil-structure interaction (SSI) analysis, input motion preparation for SSI analysis, SSI analysis, earthquake simulations/data, PSD (Power Spectral Density) related acceleration time history/spectra analysis, and plot generation.

4. METHODS

The seismic module works in the frequency domain. Earthquake motion simulation is based on the fundamental property that any periodic function can be expanded in a series of sinusoidal waves. The computer uses a random number generator to produce strings of phase angles with uniform distribution in the 0-2 pi range. Then,
a linear correction procedure due to Scanlon and Sacks is employed to derive an adjusted array of amplitudes. The acceleration ensemble is subsequently modified by a deterministic intensity function composed of three segments: an initial buildup, a stationary duration, and exponential steady decay. A parabolic correction procedure outlined by Jennings and Housner is applied to the acceleration ensemble to bring the end velocity of the ground motion to zero. The soil-structure system is represented by a three-dimensional lumped parameter type model. The structural model is built up from three-dimensional shear beam elements as well as three-dimensional spring type elements.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The superstructure model is restricted to about 20 degrees-of-freedom. The foundation configurations are primarily restricted to uniform half spaces. The free-field analysis is restricted to one-dimensional shear waves.

6. TYPICAL RUNNING TIME

Running times vary w/problem. Pentium II (266 Mhz) test computer (DOS version) took less that 1 sec between iterations.

NESC Note 91-54 "CARES" NUREG/CR-5588 Vol. 3 errata
- J. Xu et al.:
CARES (Computer Analysis for Rapid Evaluation of Structures) Version 1.0
Seismic Module Theoretical Manual
NUREG/CR-5588 (BNL-NUREG-52241) Vol.1 (July 1990)
- J. Xu et al.:
CARES (Computer Analysis for Rapid Evaluation of Structures) Version 1.0
Seismic Module User's Manual
NUREG/CR-5588 (BNL-NUREG-52241) Vol.2 (July 1990)
- J. Xu et al.:
CARES (Computer Analysis for Rapid Evaluation of Structures) Version 1.0
Seismic Module Sample Problems
NUREG/CR-5588 (BNL-NUREG-52241) Vol.3 (July 1990)
- C.J. Costantino et al.:
CARES: Computer Analysis for Rapid Evaluation of Structures Version 1.2
(September 1995)

11. HARDWARE REQUIREMENTS

CARES 1.2: SUN SPARC 60 Workstation.
CARES 1.0 : IBM PC w/640 kbytes of RAM, 10 Mbytes free drive space, one - 3.5" floppy disk drive, math coprocessor, Hercules or EGA graphics monitor.

13. SOFTWARE REQUIREMENTS: CARES 1.2: SunOS v. 5.6.
CARES 1.0: MS-DOS 3.1 or later.

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, USA

Developed by:   Brookhaven National Laboratory, Upton,
                New York, U.S.A.
                Constantino, Miller and Associates, Monsey, NY
                through the Energy Science and Technology Software Center,
                Oak Ridge, Tennessee, U.S.A.

CARES.TXT CARES Start Screen
CARESPL.EXE Option 8 plotting executable
OPT1.EXE General manager for seismic module
OPT2.EXE Deconvolution analysis
OPT3.EXE Structural data preparation for SSI analysis
OPT4.EXE Input motion preparation for SSI analysis
OPT5.EXE Soil-structure interaction analysis
OPT6.EXE Earthquake simulations/data
OPT7.EXE PSD-related accel time history/spectra analysis
CARES.BAT Startup batch
README.TXT Installation notes

psr388.tar TAR file
Makefile.ori Make file
Makefile Make file
crscmbn.f FORTRAN source
crsfft.f FORTRAN source
crspltacc.f FORTRAN source
crspltampl.f FORTRAN source
crspltmain.f FORTRAN source
crspltsp.f FORTRAN source
crspltxy.f FORTRAN source
crspstmain.f FORTRAN source
crspstpsd.f FORTRAN source
crspstsimsp.f FORTRAN source
crsslconvo.f FORTRAN source
crsslmain.f FORTRAN source
crsslmot.f FORTRAN source
crsslpsd.f FORTRAN source
crsspcalc.f FORTRAN source
crsstinpt.f FORTRAN source
crsstmain.f FORTRAN source
crsstsimco.f FORTRAN source
crsthconv.f FORTRAN source
suntitle.f FORTRAN source