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FEMA P 2139 4 2020

FEMA P 2139 4 2020

$48.75

FEMA P-2139-4: Short-Period Building Collapse Performance and Recommendations for Improving Seismic Design Volume 4 – Study of One-to-Four Story Steel Special Concentrically Braced Frame Buildings

Published By Publication Date Number of Pages
FEMA 2020 208
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PDF Catalog

PDF Pages PDF Title
1 FEMA P-2139-4
3 Title Page
5 Foreword
7 Preface
9 Table of Contents
13 List of Figures
21 List of Tables
27 Chapter 1: Introduction
28 1.1 Background and Purpose
31 1.2 Approach and Scope
35 1.3 Organization and Content
37 Chapter 2: Observed Response and Performance Benchmarks
2.1 Introduction
2.2 Observed Damage and Collapse of Modern Short-Period Steel SCBF Buildings in Past Earthquakes
38 2.2.1 Steel Braced-Frame Building Damage in the 1971 San Fernando Earthquake
39 2.2.2 Steel Braced-Frame Building Damage in the 1978 Miyagi-ken Oki Earthquake
2.2.3 Steel Braced-Frame Building Damage in the 1994 Northridge Earthquake
42 2.2.4 Steel Braced-Frame Building Damage in the 1995 Kobe Earthquake
46 2.3 Benchmark Target Collapse Rates of Steel SCBF Buildings
49 Chapter 3: Development of Building Archetype Configurations and Designs
3.1 Introduction
3.2 Factors Influencing Building Performance
3.2.1 Seismic Design Level
50 3.2.2 Occupancy and Architectural Influence on Structure Configuration
51 3.2.3 Steel Concentrically Braced Frame Design and Construction Practice
52 3.2.4 Site Class and Foundation Systems
53 3.2.5 Architectural and Nonstructural Components
3.3 Previous Studies Including Braced-Frame Archetypes
3.3.1 FEMA Model Building Types
55 3.3.2 NIST GCR 10-917-8 Evaluation of the FEMA P-695 Methodology for Quantification of Building Seismic Performance Factors
56 3.4 Archetype Design Criteria
3.4.1 Applicable Codes and Standards
3.4.2 Gravity Loads
3.4.3 Seismic Loads and Design Criteria
58 3.4.4 Foundation Design Criteria
3.5 Archetype Configurations and Designs
59 3.5.1 Baseline Configurations
Basic Geometry and Materials
61 Braced-Frame Design
62 Foundation Design
3.5.2 Parametric Studies
63 Brace Configuration Parametric Study
64 No Redundancy Parametric Study
65 Soil-Structure Interaction and Foundation Flexibility Parametric Study
66 No Reserve Moment Frame Parametric Study
67 Chapter 4: Numerical Modeling for Parametric Studies
4.1 Introduction
70 4.2 Nonlinear Analyses Modeling
4.2.1 Modeling Approach
72 4.2.2 Brace Model
74 4.2.3 Brace Connection Model
76 4.2.4 Beam Model
4.2.5 Column Model
77 4.2.6 Single Shear-Plate Connection Model
78 4.2.7 Column Base Model
81 4.2.8 Comparison of Model Behavior with Experiments
82 4.2.9 Damping
4.3 Parametric Studies and Building Archetypes
4.3.1 Overview
83 4.3.2 Baseline Configuration Parametric Study
84 4.3.3 Brace Configuration Parametric Study
4.3.4 No Redundancy Parametric Study
4.3.5 Soil-Structure Interaction and Foundation Flexibility Parametric Study
85 4.3.6 No Reserve Moment Frame Parametric Study
87 4.4 Modeling Soil-Structure Interaction and Foundation Flexibility
90 4.5 Analysis Methods and Data Analysis
4.5.1 Overview
4.5.2 Free Vibration Analyses
4.5.3 Nonlinear Static Pushover Analyses
92 4.5.4 Incremental Dynamic Analyses and Collapse Evaluation
96 4.5.5 Peak Response Calculations from IDA Analyses
97 Chapter 5: Numerical Results of Parametric Studies
5.1 Overview
5.2 Baseline Configuration Study
5.2.1 Baseline Archetypes
5.2.2 Numerical Results
103 5.2.3 Summary of Results
104 5.3 Brace Configuration Parametric Study
5.3.1 Brace Configuration Archetypes
5.3.2 Numerical Results
108 5.3.3 Summary of Results
109 5.4 No Redundancy Parametric Study
5.4.1 No Redundancy Archetypes
110 5.4.2 Numerical Results
113 5.4.3 Summary of Results
114 5.5 Soil-Structure Interaction and Foundation Flexibility Parametric Study
5.5.1 Soil-Structure Interaction and Foundation Flexibility Archetypes
115 5.5.2 Numerical Results
121 5.5.3 Summary of Results
123 5.6 No Reserve Moment Frame Parametric Study
5.6.1 No Reserve Moment Frame Archetypes
5.6.2 Numerical Results
126 5.6.3 Summary of Results
129 Chapter 6: Findings, Conclusions, and Recommendations
6.1 Introduction
6.2 Key Findings of the Parametric Studies
130 6.2.1 Baseline Configuration Parametric Study
133 6.2.2 Brace Configuration Parametric Study
134 6.2.3 No Redundancy Parametric Study
135 6.2.4 Soil-Structure Interaction and Foundation Flexibility Parametric Study
137 6.2.5 No Reserve Moment Frame Parametric Study
139 6.3 Conclusions and Recommendations
6.3.1 Comparison with Previous FEMA P-695 Collapse Probability Study
141 6.3.2 Comparison with Two-Story Archetype Model Properties and Collapse Performance
142 6.3.3 Recommendations for Improved Seismic Design Codes and Standards
145 6.3.4 Recommendations for Advanced Seismic Design and Analysis Practices
148 6.3.5 Recommendations for Enhanced Modeling and Testing
151 Appendix A: Archetype Design Criteria and Details
A.1 Introduction
A.2 Design Criteria
A.2.1 Codes
A.2.2 Materials
152 A.2.3 Site-Specific Design Criteria
A.2.4 Gravity Loads
153 A.2.5 Building Periods of Vibration
A.2.6 Seismic Design Criteria
A.2.7 Foundation Design at Braced Frames
154 A.3 Structural Plans
156 A.3.1 Framing Plans
157 A.3.2 Foundation Plans
162 A.3.3 Braced Frame and Gusset Details
167 A.3.4 Tabulated Data for Member Sizes and Gusset Properties
177 Appendix B: Development of Soil Springs, Soil Dampers, and Frequency-Modified Ground-Motion Records for the SSI Parametric Study
B.1 Introduction
B.2 Background and Theory
B.2.1 Inertial-Interaction Effects
178 B.2.2 Kinematic-Interaction Effects
179 B.3 Representative Field Sites
B.3.1 Soft Site
B.3.2 Stiff Site
180 B.4 Foundation Springs and Dampers
B.4.1 Development of the Foundation Impedances
187 B.4.2 Spring and Damper Example Calculations
190 B.5 Frequency-Modified Ground-Motion Records
193 Appendix C: Archive of Peak Response Calculations
C.1 Peak Response Parameters Archived for Each Model
195 References
203 Project Participants
208 Back Cover

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