ICES PLADS I THE PLASTIC ANALYSIS AND DESIGN SYSTEM FOR FRAMED STRUCTURES A ...

265 Pages·2008·10.34 MB·English

ICES PLADS I
THE PLASTIC ANALYSIS AND DESIGN SYSTEM
FOR
FRAMED STRUCTURES
A THESIS
Presented to
The Faculty of the Division of Graduate
Studies and Research
By
Michael Harry Swanger
In Partial Fulfillment
of the Requirements for the Degree
Master of Science in Civil Engineering
Georgia Institute of Technology
March, 1975
ICES PLADS I
THE PLASTIC ANALYSIS AND DESIGN SYSTEM
FOR
FRAMED STRUCTURES
Approved^
LLL, r-3\ A /?-.
Ler oy Z /fEm^in, Chairman
Frederick. W. Scnatz
\
« ~^
,^rur^ ~~*-~u<f
R. Richard Averit
«..2/jjj7s
Date approved by Chairma
r
ACKNOWLEDGMENTS
The research and development reported herein was
made possible by Georgia Institute of Technology, School
of Civil Engineering institutional funds. The author
gratefully acknowledges this support;.
The author also gratefully acknowledges his thesis
supervisor, Dr. Leroy Z.Emkin, who suggested the thesis
topic and who provided continuing guidance throughout
the conduct of this research. The thesis Reading Committee,
Drs. R. R. Avent and F. W. Schutz, are acknowledged for
their valuable suggestions. Mrs. Christine Cunningham
is acknowledged for her typing of this thesis document.
Finally, and most importantly, the author acknowledges
his lovely wife, Sally Swanger, for her continued encourage
ment and patience, without which this research effort would
have been impossible.
TABLE OF CONTENTS
Page
ACKNOWLEDGMENTS . ... .... . . . ......... ii
LIST OF TABLES . iv
LIST OF ILLUSTRATIONS . . . . ............ . . . . . . . . . v
SUMMARY . . . . . ........... ... vii
Chapter
I. INTRODUCTION ... . ....................... 1
II. REVIEW OF EXISTING FORTRAN COMPUTER
DESIGN SYSTEM AND PROPOSED CHANGES ..... 7
III. THE STRUCTURE, PHILOSOPHY AND USE
OF THE ICES PLADS I PROBLEM
" ,. ORIENTED LANGUAGE ... 56
IV. SUMMARY OF RESULTS ..................... 138
V. CONCLUSIONS AND RECOMMENDATIONS ........ 181
APPENDIX I ........ ...... . . . . . . . . ..... . 188
Section Properties of Rolled Steel
Shapes Used in Example Problems
APPENDIX II ..................................... . . 203
Sample of ICES PLADS I Output
APPENDIX III ........... ......... ..242
ICES PLADS I Documentation
APPENDIX IV . . ... .... . . ..... 253
ICES PLADS I Command Default Values
BIBLIOGRAPHY ..... ....................... ..%$52
LIST OF TABLES
Table Page
1. Symbol Key . . . ............. 64
2. Summary of Results for Problem Set 1 . . 160
3. Summary of Results for Problem Set 2 .......... 161
4. Summary of Results for Problem Set 3 162
5. Relative Story Deflections -
Stiffness Design, C1.1A 175
6 . Economy Beam Sections ... .•'.. ... 189
7. Non-economy Beam Sections 192
8. Economy Column Sections 196
9. Equal Leg Double Angle Bracing Sections ... 200
10. Unequal Leg Double Angle Bracing Sections 201
11. UNIVAC 1100 Series ICES Primary
Memory Management ............................. 249
12. PLADS I Command Default Values . . . . ... . . 253
LIST OF ILLUSTRATIONS
Figure Page
1. Panel Subassemblages for a Frame With an
Even Number of Bays 38
2. Panel Subassemblages for a Frame With an
Odd Number of Bays 38
3. PLADS I Global Rectangular Coordinate
System 68
4. PLADS I Local Rectangular Coordinate
System . . . . . . . . . . ...'• 69
5. PLADS I Force and Displacement Sign
Convention ...;......... 69
6. A Typical PLADS I Frame ....................... 85
7. Gravity Design -All of Problem Set 1 ......... 163
8. Example Problem C1.1A . . . . ... . . . . . 164
9 . Example Problem C2. 1A ................ 165
10. Example Problem C3.1A. . .' 166
11. Example Problem C4.1A 167
12. Example Problem C5. 1A . . . .... . . . . . . 168
13. Example Problem C6.1A 169
14. Example Problem C7.1A .......... ... 170
15. Example Problem C8.1A. . ... .. .. 171
16. Example Problem C9 . 1A . . . . . . . . . .... . ... 172
17. Example Problem CIO.1A ........................ 173
18. Example Problem EX1 and EX2 . ... . ... ...... . ... . . 174
19. Relative Story Deflections, Elastic Stiffness
Design, Prior to First Design Cycle - Example
C1.1A . . 177
VI
LIST OF ILLUSTRATIONS (Continued)
Figure Page
20. Relative Story Deflections, Elastic Stiffness
Design, After First Design Cycle - Example
CI. 1A ....... .- . . 178
21. Relative Story Deflections/Elastic Stiffness
Design, After Second Eiesign Cycle - Example
C1.1A 179
22. Effective Length of Column 20-1 ............. 180
23. ICES PLADS I Macro Flowchart ....'.. 247
vii
SUMMARY
A computerized design system written in FORTRAN
for the plastic analysis and-design of multistory steel
frames exists (5,6,7). The purpose of this thesis is to
report on extensions to this analysis and design system.
These extensions are described as follows.
1. Incorporate into the system automatic consider
ation of live load reduction coefficients.
2. Improve the convergence characteristics of the
elastic stiffness design when gravity sway deflections
are critical.
3. Include consideration of column elongation in
the calculation of delta in the P-delta effect.
4. Improve the method of computing approximate
lateral displacements by incorporating a solution based
on solving a tri-diagonal system of equations.
5. Develop a new subsystem of ICES, PLADS I,
which incorporates the existing computer programs with the
proposed extensions. This development requires the incor
poration of ICETRAN (ICES FORTRAN) programming concepts
into the existing programs as well as the development of
a Problem Oriented Language (POL) to be used by the
engineer to both specify his input as well as direct the
design and analysis procedures.
A number of example problems are presented which
illustrate that ICES PLADS I is both an efficient and
practical design tool for both engineering office and
academic use.
CHAPTER I
INTRODUCTION
The ever-increasing amount of research in the area of
applications of plastic behavior of steel to the design of
braced and unbraced multistory steel frames is leading to
the development of plastic design methods which produce safe,
functional and economical designs of multistory steel frames.
In 1958 plastic design methods were recommended for
use in the design of one- and two-story buildings by the
American Institute of Steel Construction (2). Acceptance of
plastic design methods continued to grow with the publica
tion of several manuals, handbooks and design aids which pre
sent accepted guidelines for the plastic design of braced
multistory steel frames (1*2,3,12).- The Structural Engineer
ing Handbook (9) describes some provisions for plastic de
sign in unbraced multistory steel frames. Due to continuing
efforts in this area, the 1970 AISC Specifications (2) have
included broad provisions for the plastic design of both
braced and unbraced multistory steel frames.
Plastic analysis and design methods for multistory
steel frames require the manipulation of enormous amounts of
information which makes the use of the electronic digital
computer extremely attractive, especially in the design of