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I "------.J
GUSSET DESIGN
UTILIZING
AAI012
7194by
Steve G. Hardash
Reidar 8jarhovde
TheDeportment of Civil Engineering
ond Engineering Mechanics THEUNIVERSITY
Tucson, Arizona 85721
August 1984
IGUSSET PLATE DESIGN UTILIZING
bySteve G. Hardash
andReidar Bjorhovde
Department of Civil Engineering
and Engineering HechanicsTHE UNIVERSITY
Tucson, Arizona 85721
August 1984
IACKNOWLEDGMENTS
This report was funded by a grant from the American Institute of Steel Construction, for which the authors are sincerely appreciative. Also, the interaction with Dr. R. M. Richard is appreciated. Special thanks are due Messrs. Mun-Foo Leong and A. E. Moussa for the laboratory assistance, and to our shop personnel, Messrs. W. D. Lichtenwalter and L. Lujan, for their skills rendered. iii ITABLE OF
1. INTRODUCTION.
2. SCOPE
3. 4. 5. 6. 7.PREVIOUS
THE BLOCK-SHEAR
5.1 Design of Test Specimens
5.2 Description of Fabricated Test Specimens and
Materials. . • . . . . . .
5.3 Test Set-Up and Instrumentation.
5.4 Test Procedure
TEST6.1 Results During Testing
6.2 Failure Modes for Test Specimens
A STRENGTH
7.1 Previous Test Results.
7.2 Strength Model Parameters.
7.3 Investigation of the Four Basic Block-Shear Models
7.4 Modification of the Net Tensile --Gross Shear
Strength Model . • . . . . . . • . .7.5 Refinement of Strength Model ...•...
7.6 Investigation of Effects of Other
Parameters . • . . . . • . • . . . . .7.7 Summary and Final Proposed Strength Model.
iv Page vi ix x 1 3 4 9 16 16 18 2125
31
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52
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64
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I
TABLE OF --Continued
8. RESISTANCE TENSILE GUSSET
9. APPLICATION DESIGN OF
9.1 Development of Design Curves .....
9.2Illustrative Analysis and Design Problem.
10. SUMMARY AND RECOMMENDATIONS RESEARCH.
10.1Summary . . .. .•...
Recommendations for Future Research
APPENDIX A: LOAD-DEFORMATION DATA AND TEST SPECIMENTDETAILS FOR THE PRESENT
APPENDIX B: PHOTOGRAPHS TEST SPECIMENS AFTER
TESTING FOR THE PRESENT
v Page 8383
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121
136
I
LIST OF ILLUSTRATIONS
IFigure
3.1 Page Whitmore Criterion for Determining Effective Width. 5 I3.2 Gusset Plate Detail . . . . . . . . . . . • . 7
4.1 Block-Shear Model of Failure for a Coped Beam Web 11
I4.2 Modified Block-Shear Model of Failure for a Coped
Beam Web. . . . . . . •.• 13
I4.3 Proposed Block-Shear Model for Gusset Plates. 15
I 5.15.2 General Gusset Test Plate Configuration . . 17
Fabrication Details for the Test Connection SplicePlates. • 22
I5.3 Fabrication Details for the Fixed End Splice Plates
and Bearing Assemblies .• 23 I5.4 Instrumentation for Test Plates Nos. 1, 2, and 3. 26
I 5.55.6 Instrumentation for Test Plates Nos. 4 to 28. 27
Front and Side View of a Typical Test Set-up. 28
I5.7 Test Set-up for Test Plate No. 28 . . 29
6.1 Load-Deformation Curve for Test Plate No. 28. 32
I6.2 Growth of Yield Lines During Testing of Plate No. 28. 34
I 6.36.4 Test Plate No. 28 at the End of the Loading Cycle 36
TWo Basic Failure Modes for the Gusset Test Plates. 38 I6.5 Test Plate No. 18 at the End of the Loading Cycle 39
7.1Fabrication Details for Test Connection ADl 41
I7.2 Failure Mode for Test Connection ADl. . 42
I vi I7.10(a)
7.10(b)
7.10(c)
7.10(d)
7.11 7.12 7.13 7.14LIST --Continued
Fabrication Details for the Test
Plates Which Failed During the
of Illinois StudyConnection Gusset
1963 University
Failure Modes for Two of the Gusset Plates Tested
During the 1963 University of Illinois Study . .
General Test Set-up for the University of Alberta
Study. . . • . • . • . . . . . . . . . • . • Fabrication Details for the 30· and 60· Bracing Angle Gusset Plate . . . • . . . . . . . . .Fabrication Details for the 45· Bracing Angle
Gu sset Plate . . . . . . . • . • . . .General Load-Deformation Daigram Showing Contribu
tion of Tensile Resistance and Shear Resistance in the Ultimate Strength ModelFour Baisc Free Body Sections ..
Professional Factor Using Tensile Gross Area and
Shear Gross Area . . . . . . . . . . . •
Professional Factor Using Tensile Net Area and
Shear Gross Area • . . . . • . . . . . .Professional Factor Using Tensile Gross Area and
Shear Net Area • . . . . . . . . . . . .
Professional Factor Using Tensile Net Area and
Shear Net Area • . . • . . • . . .Values of the Connection Length Factor to Give
P 1.0, Expressed as a Function of the
Connection Length. . • . . • . . . . . .•Professional Factor vs. Connection Length Using
42 Data Points . • . . . • . • .
Least Squares Lines for 39 and 42 Data Points.
Professional Factor vs. Connection Length Using
39 Data Points . . . . . . . • . • . . . . • .
vii Page 4445
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59
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63
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67
I
Figure
7.15 I 7.16 7.17I 7.18
I 7.19 7.20 I 7.21 7.22 I 7.23 I 9.1 I 9.2 ILIST OF ILLUSTRATIONS --Continued
Professional Factor vs. Edge Distance.
Professional Factor vs. Bolt Pitch .
Professional Factor vs. Outside Bolt Gage.
Professional Factor vs. Plate Thickness.
Professional Factor vs. Fastener Size.
Professional Factor vs. Plate Geometry
Professional Factor vs. Plate Material Yield Stress.Professional Factor vs. Plate Material Ultimate
Tensile Stress . • . • . • . . . •Factor vs. Plate Material Yield
Stress to Ultimate Tensile Stress Ratio.
Design Curves for A36 Steel Plate Material
Details of the Gusset Plate Connection to be
Designed
viii Page 6970
7l 72
73
74
75
76
77
84
86
I
LIST OF TABLES
5.1 Test Connection Details for the Present Study.
7.1 Test Connection Details for Previous Studies.
7.2 Observed Ultimate Load for Each Test Specimen.
ix Page 19 4955
I. I