NESC0451 SAFE-CRACK

SAFE-CRACK, Viscoelastic Analysis of Plane and Axisymmetric Concrete System, Finite Elements Method

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: SAFE-CRACK

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2. COMPUTERS

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Program name	Package id	Status	Status date
SAFE-CRACK	NESC0451/01	Tested	01-JUL-1976

Machines used:

Package ID	Orig. computer	Test computer
NESC0451/01	IBM 370 series	IBM 370 series

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3. DESCRIPTION OF PROBLEM OR FUNCTION

SAFE-CRACK performs a  visco-
elastic  analysis of  plane  and  axisymmetric composite  concrete
structures  subjected  to  transient  temperature  and  mechanical
loadings.   The  specific   creep  of  concrete  as   an  age  and
temperature-dependent   function,  and   concrete  failure   under
combined stresses  are considered.  Particular emphasis  is placed
on the cracking analysis in  concrete structures and the nonlinear
dependence of creep property on transient temperature.

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4. METHOD OF SOLUTION

The  program uses  the finite-element  method
which reduces the  problem to the solution of a  system of coupled
integral  equations.  The  Cholesky method  is used  to solve  the
linear system of equations and the trapezoidal rule is applied for
the time integration.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   300 nodes
   675 elements
    70 time-steps

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6. TYPICAL RUNNING TIME: 90 minutes are required for a full-capacity
problem.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS: SAFE-CREEP (NESC Abstract 300)

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9. STATUS

Package ID	Status date	Status
NESC0451/01	01-JUL-1976	Tested at NEADB

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10. REFERENCES

Y. R. Rashid, Nonlinear Quasi-static Analysis of Two-
dimensional Concrete Structures,  Part I Theory, Part  II Computer
Program Manual, GA-9994, March 23, 1970.
             R.  D.  Browne,  Properties of  Concrete  in  Reactor
Vessels, Conference  on Prestressed  Concrete Pressure  Vessels at
Church House, Westminster, S.W. 1, 13-17 March 1967, The Institute
of Civil Engineers, London, pp. 131-151, 1968.
             NTRAN, I/O Routines  for Tape and Drum,  Excerpt from
UNIVAC 1107 FORTRAN IV Programmers Reference Manual, UP-3569, Rev.
1.

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11. MACHINE REQUIREMENTS: 65K memory and 13 tapes

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0451/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: EXEC2.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

  CALL
TICKER refers to an 1108 system routine for logging job time used.
A substitute routine  will be required for use of  this program on
another machine.   SAFE-CRACK calls several plotting  routines not
included with the program.  These routines are proprietary and may
be dummied out.

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15. NAME AND ESTABLISHMENT OF AUTHOR

                 Y. R. Rashid
                 General Atomic Company
                 P. O. Box 81608
                 San Diego, California  92138

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16. MATERIAL AVAILABLE

NESC0451/01

File name	File description	Records
NESC0451_01.001	INFORMATION	11
NESC0451_01.002	SOURCE PROGRAM (F4)	3478
NESC0451_01.003	'NTRAN' ASSEMBLER ROUTINE	121
NESC0451_01.004	OVERLAY CARDS	12
NESC0451_01.005	DD CARDS FOR THE EXECUTION	19
NESC0451_01.006	SAMPLE PROBLEM INPUT DATA	92
NESC0451_01.007	SAMPLE PROBLEM PRINTED OUTPUT	1058

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17. CATEGORIES

I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: concretes, creep, elasticity, finite element method, mechanical structures, solids, stresses, two-dimensional.