ESTS0012 CARES-ESTSC. (Abstract last modified 21-MAY-1999)
1.
NAME OR DESIGNATION OF PROGRAM - CARES. 2.
COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -
To request or retrieve programs click on the one of the active versions below.
A password and special authorization is required. Explanation of the status codes.
Machines used:
Package-ID Orig.Computer Test Computer
ESTS0012/01 IBM PC PC-80486
3.
DESCRIPTION OF PROGRAM OR FUNCTION - CARES, 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. CARES 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 CARES 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.
METHOD OF SOLUTION - 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 0-2pi 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 - 7.
UNUSUAL FEATURES OF THE PROGRAM - CARES allows the user interactively to go through all basic steps of seismic analysis starting with a design ground motion to the floor response spectra used for subsystem analysis. 8.
RELATED AND AUXILIARY PROGRAMS - The free-field response (convolution/deconvolution) methodology of CARES is based on the SLAVE code, while the soil-structure interaction analysis and development of floor response spectra is based on the SIM (Structure In Media) computer code. The algorithm for generating artificial ground acceleration time histories compatible with design response spectra is based on an earlier MIT computer program. 9.
STATUS 10.
REFERENCES - 11.
MACHINE REQUIREMENTS - 12.
PROGRAMMING LANGUAGE(S) USED - 13.
OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - UNIX. 14.
OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - 15.
NAME AND ESTABLISHMENT OF AUTHORS - 16.
MATERIAL AVAILABLE - 17.
CATEGORIES - Keywords: MECHANICAL STRUCTURES, NUCLEAR POWER PLANTS, RESPONSE FUNCTIONS, SEISMIC EFFECTS, SPECTRAL DENSITY, STRUCTURE
Program-name Package-ID Status
CARES-ESTSC ESTS0012/01 Tested
CARES1.2-ESTSC ESTS0012/02 Obsolete
ESTS0012/01: 03-JUL-1995 Tested at NEADB
ESTS0012/02: 21-MAY-1999 Obsolete
ESTS0012/01:
- J. Xu, A.J. Philippacopoulas, C.A. Miller, and C.J. Costantino:
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, A.J. Philippacopoulas, C.A. Miller, and C. J. Costantino:
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, A.J. Philippacopoulas, C.A. Miller, and C.J. Costantino:
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).
- L. Reed:
Errata (February 28, 1991).
ESTS0012/01:
The program was installed at the NEA Data Bank on a
DELL 466/L PC/80486 with 66 MHz.
ESTS0012/01: FORTRAN
ESTS0012/01:
The PC ran under MS-DOS 6.20.
C.J. Costantino, C.A. Miller, E. Heymsfield, and A. Yang
Constantino, Miller and Associates, Monsey, NY (U.S.A.)
ESTS0012/01:
ESTS0012_01.001 Information file 128 records
ESTS0012_01.002 CARES execution batch file 43 records
ESTS0012_01.003 CARES option information 17 records
ESTS0012_01.004 CARES option 1 general manager module 0 records
ESTS0012_01.005 CARES option 2 convolution module 0 records
ESTS0012_01.006 CARES option 3 SSI analysis module I. 0 records
ESTS0012_01.007 CARES option 4 SSI analysis module II. 0 records
ESTS0012_01.008 CARES option 5 SSI analysis module 0 records
ESTS0012_01.009 CARES option 6 earthquake simulation module 0 records
ESTS0012_01.010 CARES option 7 PSD computations module 0 records
ESTS0012_01.011 CARES option 8 plotting module 0 records
ESTS0012_01.012 DOS file-names 11 records
- I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies
Home - About Us - Work Areas - Data Bank - Publications - Press Room - List of acronyms - Search