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FEMA P 1026 508 2015

FEMA P 1026 508 2015

$18.20

FEMA P-1026, Seismic Design of Rigid Wall-Flexible Diaphragm Buildings

Published By Publication Date Number of Pages
FEMA 2015 184
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PDF Catalog

PDF Pages PDF Title
1 FEMA P-1026: Seismic Design of Rigid Wall-Flexible Diaphragm Buildings: An Alternate Procedure
3 Title Page
4 Disclaimer
5 Foreword
6 Preface
7 Acknowledgments
9 Table of Contents
13 List of Tables
15 List of Figures
17 Acronyms
19 Chapter 1 Introduction
20 1.1 The Need for a New Design Procedure for RWFD Buildings
1.2 Purpose of Report
21 1.3 Introduction to the Alternate Procedure and Comparison toCurrent Design Practice
24 1.4 Implementation of the Alternate Design Procedure
1.5 Scope and Limitations of the Alternate Procedure
25 1.6 Overview of Report Contents
29 Chapter 2 Description of RWFD Buildings and Their Performance in Earthquakes
2.1 Description of Typical RWFD Structures
30 2.2 Seismic Performance History
35 Chapter 3 Current Design Practice Example
3.1 Example Building Description (current practice)
37 3.2 Determine Design Spectral Response Accelerations SDS and SD1(current practice)
3.3 Determine Fundamental Building Period (current practice)
38 3.4 Base Shear Using the ELF Procedure (current practice)
39 3.5 Diaphragm Design Forces Using the ELF Procedure (current practice)
43 3.6 North/South Diaphragm Shear Design (current practice)
48 3.7 North/South Diaphragm Chord Design (current practice)
49 3.8 East/West Diaphragm Shear Design (current practice)
50 3.9 East/West Diaphragm Chord Design (current practice)
51 3.10 Shear Wall Force Using the ELF Procedure (current practice)
54 3.11 Shortcomings of Current Practice
55 Chapter 4 Development of an Alternate Seismic Design Procedure
56 4.1 Determination of Building and Diaphragm Period
59 4.2 Response Modification Coefficient, R, Selection
61 4.2.1 Encouraging Distributed Inelastic Behavior
62 4.2.2 Diaphragm Response Modification Coefficient and Shear Amplification
63 4.3 Deflection Amplification Factor, Cd , Selection
4.4 Overstrength Factor, Ωo, Selection
64 4.5 Overview of the Alternate Seismic Design Procedure
67 Chapter 5 Implementation of the Alternate Seismic Design Procedure
5.1 A Two-Stage ELF Procedure
68 5.2 First Stage – Diaphragm Design
5.3 Diaphragm Design Coefficient Cs Using the ELF Procedure
72 5.4 Diaphragm Forces Using the ELF Procedure
75 5.5 North/South Diaphragm Shear Design
80 5.6 North/South Diaphragm Shear Transfer to Walls
5.7 North/South Diaphragm Chord Design
81 5.8 East/West Diaphragm Shear Design
82 5.9 East/West Diaphragm Shear Transfer to Walls
83 5.10 East/West Diaphragm Chord Design
5.11 Second Stage – Shear Wall Design
84 5.12 Shear Wall Force Using the ELF Procedure
89 5.13 Limitations and Adaptations of the Alternate Design Procedure
91 Chapter 6 Diaphragm Deflection Check
6.1 Deflection of North/South Diaphragm
95 6.2 Deflection of North/South Walls
97 6.3 Limits on Diaphragm Deflection – Deformation Compatibility
6.4 Limits on Diaphragm Deflection – Second Order Effects and P-Δ Instability
99 6.5 Limits on Diaphragm Deflection – Building Separations and Setbacks
101 Chapter 7 Comparison of Designs Using Current Practiceand Alternate Design Procedure
105 Chapter 8 Future Studies for Design of RWFD Buildings
8.1 Steel Deck Diaphragms
8.2 Out-of-Plane Top of Wall Anchorage Forces
106 8.3 In-Plane Wall Yielding/Rocking
8.4 Irregular Plan Shapes and Abrupt Changes along Exterior Walls
107 8.5 Combining Connector Forces from Shear Acting in Two OrthogonalDirections
8.6 Forces on Continuity Ties
8.7 Three-Dimensional Modeling Calibrated to the Response of Buildingsand Tests
8.8 Deflection of Wood Diaphragms
108 8.9 Applicability to Buildings with Lightweight Enclosures and SteelBracing
8.10 Applicability to Multi-Story Buildings
8.11 Implications of Diaphragm Deflections on Structural and Nonstructural Elements
109 8.12 Large-Scale Diaphragm Tests
111 Chapter 9 Conclusions
113 References
117 Appendices
APPENDIX A Alternate Design Procedure Discussionand Commentary
A.1 Commentary on Alternate Design Procedure with Diaphragm Yielding
121 A.2 Limitations of the Alternate Design Procedure
122 A.3 Applicability of Alternate Design Procedure to RWFD Buildings with Steel Deck Diaphrams
123 A.4 Discussion of Diaphragm Yielding
A.5 Quality of Design, Construction and Inspection
124 A.6 Diaphragm Modifications and Deterioration
A.7 Possible Code Provisions
129 APPENDIX B Evaluating RWFD Buildings Using FEMA P695 Methodology
131 B.1 Modeling Framework
134 B.2 Modeling Framework Validation
137 APPENDIX C List of Connectors in Database
139 APPENDIX D Evaluation of Current Design Procedure
D.1 Description of Archetypes
141 D.2 Summary of FEMA P695 Analysis Results for Current Design
144 D.3 Fundamental Period of the Archetypes
147 APPENDIX E Description of Archetypes for Current Design Procedure
163 APPENDIX G Evaluation of Alternate Design Procedure
G.1 Description of Archetypes
G.2 Summary of FEMA P695 Analysis Results for the Alternate DesignProcedure
165 G.3 Overstrength and Deflection Amplification Factors for the Diaphragm
167 Appendix H Description of Archetypes for the Alternate Design Procedure
H.1 Description of Archetypes for the Alternate Design Procedure
171 Appendix I FEMA P695 Evaluation Results for theAlternate Design Procedure
I.1 FEMA P695 Evaluation Results for Alternate Design Procedure
175 APPENDIX J Out-of-Plane Wall and Wall Anchorage Forces
J.1 Out-of-Plane Wall and Wall Anchorage Forces; Current Design
176 J.2 Out-of-plane Wall Anchorage Force Study
179 J.3 Stiffness of Wall Anchorage Connections
J.4 Transfer of Wall Anchorage Forces to Continuous Diaphragm Ties
181 APPENDIX K Analysis of Archetypes Using Uniform Nailing

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