FEMA P 2091 2020

$36.40

FEMA P-2091: A Practical Guide to Soil-Structure Interaction

Published By	Publication Date	Number of Pages
FEMA	2020	218

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Description

PDF Catalog

PDF Pages	PDF Title
1	00-FEMAP-2091_Cover_508
2	Blank Page
3	01-FEMAP-2091-TitlePage_20201202_508
5	02-ATC-144 Preface_20201202_508
7	03-FEMAP-2091-ToC_AH20201015_508
11	04-FEMAP-2091_LoF_508
16	Blank Page
17	05-FEMAP-2091_LoT_508
20	Blank Page
21	08-ATC-144 Chapter 1 Intro_20201202_508 1.1 Overview 1.2 Types of Soil-Structure Interaction Modeling
22	1.3 Purpose of the Guide 1.4 Scope of the Guide 1.5 Target Audience for the Guide
23	1.6 Key SSI Terminology
24	1.7 Tips for Understanding and Implementing SSI
25	1.8 Organization of the Guide
27	09-ATC-144 Chapter 2 Where SSI is Important 20201202_508 2.1 Overview 2.2 Large Building Footprint Reduces Design Forces
28	2.3 Substantial Foundation Embedment Reduces Design Forces 2.4 High Structure-to-Soil Stiffness Ratios Will Lengthen Period and Change Design Forces
30	2.5 Foundation Rocking Impacts Superstructure Behavior
33	10-ATC-144 Chapter 3 Rule of Thumb 20201202_508 3.1 Overview 3.2 Key Equation
34	3.3 Determining Average Effective Shear Wave Velocity Step 1: Determine footing embedment depth, e. Step 2: Determine the effective profile depth, zp. Step 3: Determine the effective depth for foundation rotation, e + zp. Step 4: Determine the average low strain shear wave velocity, vso, over the effective depth for foundation rotation.
35	Step 5: Determine the effective shear wave velocity ratio, vs / vso. Step 6: Determine the average effective shear wave velocity, vs. 3.4 Determining Fundamental Period of the Structure
36	3.5 Example 3.5.1 Building Description
38	3.5.2 Average Effective Shear Wave Velocity Step 1: Determine footing embedment depth, e. Step 2: Determine the effective profile depth, zp. Step 3: Determine the effective depth for foundation rotation, r. Step 4: Determine the average low strain shear wave velocity, vso, over the rocking depth. Step 5: Determine the effective shear wave velocity ratio, vs / vso. Step 6: Determine the average effective shear wave velocity, vs.
39	3.5.3 Fundamental Period of the Structure 3.5.4 Structure-to-Soil Stiffness Ratio 3.6 Comparisons Using Site Class
43	11-ATC-144 Chapter 4 Base Slab Averaging_20201202_508 4.1 Overview
44	4.2 Key Equations
45	4.3 Determining Effective Foundation Size 4.4 Determining whether Base Slab Averaging Applies
46	4.5 Limitations and Issues
47	4.6 Example
50	Blank Page
51	12-ATC-144 Chapter 5 Embedment 20201202_508 5.1 Overview 5.2 Key Equation
52	5.3 Determining Depth of Embedment
56	5.4 Limitations and Issues
57	5.5 Example
62	Blank Page
63	13-ATC-144 Chapter 6 Soil Flexibility_AH20201202_508 6.1 Overview
64	6.2 Soil Properties for Flexibility Calculations
65	6.3 Vertical and Rotational Springs 6.3.1 Method 1 – Rigid Foundation and Flexible Soil
70	6.3.2 Method 2 – Flexible Foundation and Nonlinear Flexible Soil 6.3.3 Method 3 – Flexible Foundation and Linear Flexible Soil
71	6.4 Horizontal Springs
72	6.4.1 Method 1
74	6.4.2 Resistance due to Passive Pressure
75	6.4.3 Resistance due to Friction or Cohesion
76	6.5 Bounding Analyses 6.6 Vertical and Rotational Spring Example
77	6.6.1 Method 1 6.6.2 Method 3
78	6.7 Horizontal Spring Example 6.7.1 Method 1
79	6.7.2 Passive Pressure and Friction
80	Blank Page
81	14-ATC-144 Chapter 7 Period Lengthening_20201202_508 7.1 Overview
82	7.2 Key Equation
85	7.3 Examples to Illustrate Dynamic Response
91	7.4 Example Using Code Equations
92	7.4.1 Calculations for the Fixed-Base Condition
93	7.4.2 Calculations for the Flexible-Base Condition
95	7.4.3 Summary of Design Demands
97	15-ATC-144 Chapter 8 Foundation Damping_20201202_508 8.1 Overview
98	8.2 Foundation Damping Requirements
100	8.3 Effective Damping Ratio
101	8.4 Soil Damping 8.4.1 Discussion
102	8.4.2 Soil Damping Example
104	8.5 Radiation Damping 8.5.1 Discussion
105	8.5.2 Radiation Damping Example
112	8.6 Limitations and Issues 8.6.1 Limitations on the Influence of Radiation Damping 8.6.2 Potential Code Changes Related to Foundation Damping
114	Blank Page
115	16-ATC-144 Chapter 9 Basements AH20201104_508 9.1 Overview 9.2 Past Analytical Comparisons of Different Models 9.2.1 Models Studied
118	9.2.2 Recommended Models
119	9.3 Models for Buildings on Relatively Level Grade 9.3.1 Example Building 9.3.2 Model 1 for Example Building
121	9.3.3 Model 2 for Example Building
123	9.4 Models for Buildings on Sloping Grade 9.4.1 Example Building
124	9.4.2 Model 2 for Example Building
126	Blank Page
127	17-ATC-144 Chapter 10 Conclusions and Recs_20201221_508 10.1 Overview 10.2 Conclusions
128	10.3 Other Helpful Resources 10.4 Comparison of SSI Provisions 10.5 Recommendations 10.5.1 Recommendations for Code Developers
129	Technical Revisions
130	Editorial Revisions
132	10.5.2 Recommendations for Further Study
135	18-ATC-144 App A Two-Story Example_20201202_508 A.1 Overview
136	A.1.1 Outline of the Example A.1.2 Limitations in ASCE/SEI 7-16 Chapter 19 A.2 Site Description
139	A.3 Building Description A.3.1 Gravity Framing A.3.2 Lateral Framing
140	A.3.3 Gravity Loads and Seismic Weight
141	A.3.4 Foundation System
143	A.4 Initial Design A.4.1 Base Shear per ASCE/SEI 7-16 Chapter 12 Equivalent Lateral Force Procedure
144	A.4.2 Brace Design
145	A.4.3 Foundation Design
146	A.4.3.1 Transverse Frame Foundation
148	A.4.3.2 Longitudinal Frame Foundation
149	A.4.4 Fixed-base Modal Analysis A.5 Flexible-base Analysis
150	A.5.1 Vertical Springs
151	A.5.2 Lateral Springs
154	A.5.3 Flexible-base Modal Analysis
155	A.6 Foundation Damping
156	A.6.1 Soil Hysteretic Damping A.6.2 Radiation Damping
160	A.6.3 Adjusted Base Shear
161	A.6.4 Code-limited Adjusted Base Shear A.7 Design for SSI-Reduced Base Shear per ASCE/SEI 7-16 Chapter 19 A.7.1 Brace Design
162	A.7.2 Foundation Design A.7.3 Fixed-base Modal Analysis A.7.4 Flexible-base Modal Analysis
163	A.7.5 Check of Base Shear
164	A.8 Design for Full Theoretical SSI-Reduced Base Shear A.8.1 Base Slab Averaging
166	A.8.2 Brace Design
167	A.8.3 Foundation Design A.8.4 Fixed-base Modal Analysis A.8.5 Flexible-base Modal Analysis
168	A.8.6 Check of Base Shear A.8.7 Redesign (Iteration) A.8.8 Reanalysis
169	A.8.9 Check of Base Shear
170	Blank Page
171	19-ATC-144_AppB_TallBuilding_20201202_508 B.1 Overview B.1.1 Outline of the Example
172	B.2 Site Description B.2.1 Geotechnical Properties
173	B.2.2 Seismic Ground Motion Parameters B.3 Building Description B.3.1 Framing Systems
178	B.3.2 Material Properties and Modeling Criteria
179	B.3.3 Gravity Loads and Seismic Mass
180	B.4 Initial Design (Model 1) B.4.1 Base Shear per Chapter 12 ELF
183	B.4.2 Fixed-Base Modal Analysis B.4.3 Story Shears and Moments B.4.4 Story Drifts B.4.5 Foundation Design
187	B.5 Spectral Modifications for Kinematic SSI B.5.1 Base Slab Averaging
188	B.5.2 Embedment
190	B.6 SSI Adjusted Structural Demands B.6.1 Period Elongation Due to Flexible Base
191	B.6.2 Foundation Damping
193	B.6.3 ELF Base Shear Adjusted for SSI
194	B.6.4 Story Shears, Moments, and Drifts
197	B.7 Design Variations B.7.1 Building Without Basement, Fixed Base (Model 3) B.7.2 Building Without Basement, Flexible Base (Model 4)
199	B.7.3 Sensitivity to Lower-Bound and Upper-Bound Spring Stiffnesses
201	20-ATC-144 AppC Helpful Resources_20201202_508
203	21-ATC-144 References_20201202_508 CSI, 2016, SAP2000 Version 18.2, Computers and Structures, Inc., Walnut Creek, California.
206	Blank Page
207	22-ATC-144 Glossary AH20201106_508
210	Blank Page
211	23-ATC-144 Symbols AH20201106_508
215	24-ATC-144 Participants_20201202_508 FEMA Oversight ATC Management and Oversight Project Technical Committee Project Review Panel
216	Working Group Members
217	Blank Page
218	30-FEMAP-2091_BackCover_508