Computer Programs
NESC0539 STRAP
last modified: 01-MAR-1975 | catalog | categories | new | search |

NESC0539 STRAP

STRAP-2, Stress Analysis of Structure with Static Loading by Finite Elements MethodSTRAP-D, Stress Analysis of Structure with Time-Dependent Loading by Finite Elements Method

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1. NAME OR DESIGNATION OF PROGRAM:  STRAP
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2. COMPUTERS
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Program name Package id Status Status date
STRAP-D NESC0539/01 Tested 01-MAR-1975
STRAP-S NESC0539/02 Tested 01-MAR-1975

Machines used:

Package ID Orig. computer Test computer
NESC0539/01 IBM 370 series IBM 370 series
NESC0539/02 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

The  code  STRAP  (STructural
Analysis  Package)  was  developed  to  analyze  the  response  of
structural  systems  to  static and  dynamic  loading  conditions.
STRAP-S  solves  for  the  displacements   and  member  forces  of
structural systems  under static loads and  temperature gradients.
STRAP-D  will  solve  numerically   a  given  structural  dynamics
problem.
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4. METHOD OF SOLUTION

STRAP-S generates  the stiffness matrix  of a
structure by  the finite element  method and solves  the resulting
equations for structural displacements and member forces.  STRAP-D
generates  the  stiffness  matrix,   solves  for  eigenvalues  and
eigenvectors,  uncouples and  solves  the  series of  second-order
ordinary differential equations, and then calculates and plots the
requested member forces.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

STRAP-S maxima -
250 degrees of freedom
100 members
STRAP-D maxima -
100 degrees of freedom
80 time-steps in the forcing function input
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6. TYPICAL RUNNING TIME

STRAP-S running time is about 5 seconds for
a  97  degree  of  freedom   problem.   STRAP-D  running  time  is
approximately 15 seconds for a plane  frame, 6 degrees of freedom,
6 modal  shape (0  to 1 second)  problem with  3 plots,  while 1.5
minutes are required for a vibrating  beam, 41 degrees of freedom,
2 modes (0 to 1 second) problem with 5 plots.
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7. UNUSUAL FEATURES OF THE PROGRAM

STRAP-D allows forcing functions
input  to  be  in  the  form   of  pressures,  forces,  or  ground
accelerations.  Initial conditions  (displacements and velocities)
can be specified  as zero, or displacements can  be calculated, or
displacements  and velocities  can  be  read from  input.   Member
forces can be calculated and plotted by STRAP-D.
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8. RELATED AND AUXILIARY PROGRAMS

Integral parts of STRAP-D include
an  eigenvalue-eigenvector   routine  (THJCOB)  by  C.   Noble,  a
stiffness  generator (STIFGN)  by  J.  A. Dearien,  a  Runge-Kutta
integration  technique  (RKINTZ)  by  R. D.  Peak,  and  a  matrix
inversion routine (MAINV) by D. H. Gipson.
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9. STATUS
Package ID Status date Status
NESC0539/01 01-MAR-1975 Tested at NEADB
NESC0539/02 01-MAR-1975 Tested at NEADB
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10. REFERENCES

J. A. Dearien, C. Noble, and  E. D. Uldrich, STRAP, A
Computer  Code for  Static  and  Dynamic Structural  Analysis  and
Studies Made Using the Code, IN-1362, June 1970.
J. A. Dearien, STRAP-S,  Structural Analysis Package-
Static, ANC Program Writeup, October 1969.
L. J. Siefken, STRAP-D,  Structural Analysis Package-
Dynamic, ANC Program Writeup, October 1971.
W.  Weaver,  Jr., Computer  Programs  for  Structural
Analysis, D. Van Nostrand Co., Inc., Princeton, New Jersey, 1967.
W.  C.  Hurty  and  M.  F.  Rubinstein,  Dynamics  of
Structures,  Prentice-Hall, Inc.,  Englewood  Cliffs, New  Jersey,
1964.
S.  L. Rogers,  Dynamics of  Framed Structures,  John
Wiley & Sons, Inc., New York, 1959.
J. B.  Scarborough, Numerical  Mathematical Analysis,
The John Hopkins Press, Baltimore, Maryland, 1955.
W.  T. Thomson,  Vibration  Theory and  Applications,
Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1965.
N.  Willems and  W.  M.  Lucas, Matrix  Analysis  for
Structural Engineers,  Prentice-Hall, Inc., Englewood  Cliffs, New
Jersey, 1968.
NESC0539/01, included references:
- J. A. Dearien, C. Nobel, and E. D. Uldrich;
STRAP, A Computer Code for Staistic and Dynamic Structural
Analysis and Studies Made Using the Code, IN-1362, June 1970.
- J. A. Dearien;
STRAP-S, Structural Analysis Package-Static, Program Writeup,
October, 1969.
- L. J. Siefken;
STRAP-D, Structural Analysis Package-Dynamic, Program
Writeup, October 1971.

NESC0539/02, included references:
- J. A. Dearien, C. Nobel, and E. D. Uldrich;
STRAP, A Computer Code for Static and Dynamic Structural
Analysis and Studies Made Using The Code, June 1970.
- J. A. Dearien;
STRAP-S, Structural Analysis Package-Static, Program Writeup,
October 1969.
- L. J. Siefken;
STRAP-D, Structural Analysis Package-Dynamic, Program
Writeup, October 1971.
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11. MACHINE REQUIREMENTS

300K bytes of memory  for each program plus
5 to  7 direct  access storage  devices besides  standard I/O  for
STRAP-D
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0539/01 FORTRAN-IV
NESC0539/02 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

STRAP-D uses plotting subroutines currently  in the NRTS operating
system.
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15. NAME AND ESTABLISHMENT OF AUTHORS

J. A. Dearien and E. D. Uldrich
EG&G Idaho, Inc.
P. O. Box 1625
Idaho Falls, Idaho  83401
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16. MATERIAL AVAILABLE
NESC0539/01
File name File description Records
NESC0539_01.001 INFORMATION 2
NESC0539_01.002 DD-CARDS FOR ALL 3 EXECUTION STEPS 29
NESC0539_01.003 STEP-1 SOURCE PROGRAM (F4) 2081
NESC0539_01.004 STEP-1 SAMPLE PROBLEM INPUT DATA 68
NESC0539_01.005 STEP-1 SAMPLE PROBLEM PRINTED OUTPUT 232
NESC0539_01.006 STEP-2 SOURCE PROGRAM (F4) 2413
NESC0539_01.007 STEP-2 SAMPLE PROBLEM INPUT DATA 58
NESC0539_01.008 STEP-2 SAMPLE PROBLEM PRINTED OUTPUT 5446
NESC0539_01.009 INFORMATION 2
NESC0539_01.010 STEP-3 SOURCE PROGRAM (F4) 624
NESC0539_01.011 STEP-3 SAMPLE PROBLEM INPUT DATA 3
NESC0539_01.012 STEP-3 SAMPLE PROBLEM PRINTED OUTPUT 12
NESC0539/02
File name File description Records
NESC0539_02.001 INFORMATION 2
NESC0539_02.002 SOURCE PROGRAM (F4) 1226
NESC0539_02.003 SAMPLE PROBLEM INPUT DATA 13
NESC0539_02.004 SAMPLE PROBLEM PRINTED OUTPUT 97
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17. CATEGORIES
• I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: differential equations, dynamic loads, finite element method, matrices, mechanical structures, static loads, temperature gradients.