Already a subscriber? 
MADCAD.com Free Trial
Sign up for a 3 day free trial to explore the MADCAD.com interface, PLUS access the
2009 International Building Code to see how it all works.
If you like to setup a quick demo, let us know at support@madcad.com
or +1 800.798.9296 and we will be happy to schedule a webinar for you.
Security check
Please login to your personal account to use this feature.
Please login to your authorized staff account to use this feature.
Are you sure you want to empty the cart?
FEMA P-2091: A Practical Guide to Soil-Structure Interaction, 2020
- 00-FEMAP-2091_Cover_508
- 01-FEMAP-2091-TitlePage_20201202_508
- 02-ATC-144 Preface_20201202_508
- 03-FEMAP-2091-ToC_AH20201015_508
- 04-FEMAP-2091_LoF_508
- 05-FEMAP-2091_LoT_508
- 08-ATC-144 Chapter 1 Intro_20201202_508 [Go to Page]
- 1.1 Overview
- 1.2 Types of Soil-Structure Interaction Modeling
- 1.3 Purpose of the Guide
- 1.4 Scope of the Guide
- 1.5 Target Audience for the Guide
- 1.6 Key SSI Terminology
- 1.7 Tips for Understanding and Implementing SSI
- 1.8 Organization of the Guide
- 09-ATC-144 Chapter 2 Where SSI is Important 20201202_508 [Go to Page]
- 2.1 Overview
- 2.2 Large Building Footprint Reduces Design Forces
- 2.3 Substantial Foundation Embedment Reduces Design Forces
- 2.4 High Structure-to-Soil Stiffness Ratios Will Lengthen Period and Change Design Forces
- 2.5 Foundation Rocking Impacts Superstructure Behavior
- 10-ATC-144 Chapter 3 Rule of Thumb 20201202_508 [Go to Page]
- 3.1 Overview
- 3.2 Key Equation
- 3.3 Determining Average Effective Shear Wave Velocity [Go to Page]
- 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.
- 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
- 3.5 Example [Go to Page]
- 3.5.1 Building Description
- 3.5.2 Average Effective Shear Wave Velocity [Go to Page]
- 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.
- 3.5.3 Fundamental Period of the Structure
- 3.5.4 Structure-to-Soil Stiffness Ratio
- 3.6 Comparisons Using Site Class
- 11-ATC-144 Chapter 4 Base Slab Averaging_20201202_508 [Go to Page]
- 4.1 Overview
- 4.2 Key Equations
- 4.3 Determining Effective Foundation Size
- 4.4 Determining whether Base Slab Averaging Applies
- 4.5 Limitations and Issues
- 4.6 Example
- 12-ATC-144 Chapter 5 Embedment 20201202_508 [Go to Page]
- 5.1 Overview
- 5.2 Key Equation
- 5.3 Determining Depth of Embedment
- 5.4 Limitations and Issues
- 5.5 Example
- 13-ATC-144 Chapter 6 Soil Flexibility_AH20201202_508 [Go to Page]
- 6.1 Overview
- 6.2 Soil Properties for Flexibility Calculations
- 6.3 Vertical and Rotational Springs [Go to Page]
- 6.3.1 Method 1 – Rigid Foundation and Flexible Soil
- 6.3.2 Method 2 – Flexible Foundation and Nonlinear Flexible Soil
- 6.3.3 Method 3 – Flexible Foundation and Linear Flexible Soil
- 6.4 Horizontal Springs [Go to Page]
- 6.4.1 Method 1
- 6.4.2 Resistance due to Passive Pressure
- 6.4.3 Resistance due to Friction or Cohesion
- 6.5 Bounding Analyses
- 6.6 Vertical and Rotational Spring Example [Go to Page]
- 6.6.1 Method 1
- 6.6.2 Method 3
- 6.7 Horizontal Spring Example [Go to Page]
- 6.7.1 Method 1
- 6.7.2 Passive Pressure and Friction
- 14-ATC-144 Chapter 7 Period Lengthening_20201202_508 [Go to Page]
- 7.1 Overview
- 7.2 Key Equation
- 7.3 Examples to Illustrate Dynamic Response
- 7.4 Example Using Code Equations [Go to Page]
- 7.4.1 Calculations for the Fixed-Base Condition
- 7.4.2 Calculations for the Flexible-Base Condition
- 7.4.3 Summary of Design Demands
- 15-ATC-144 Chapter 8 Foundation Damping_20201202_508 [Go to Page]
- 8.1 Overview
- 8.2 Foundation Damping Requirements
- 8.3 Effective Damping Ratio
- 8.4 Soil Damping [Go to Page]
- 8.4.1 Discussion
- 8.4.2 Soil Damping Example
- 8.5 Radiation Damping [Go to Page]
- 8.5.1 Discussion
- 8.5.2 Radiation Damping Example
- 8.6 Limitations and Issues [Go to Page]
- 8.6.1 Limitations on the Influence of Radiation Damping
- 8.6.2 Potential Code Changes Related to Foundation Damping
- 16-ATC-144 Chapter 9 Basements AH20201104_508 [Go to Page]
- 9.1 Overview
- 9.2 Past Analytical Comparisons of Different Models [Go to Page]
- 9.2.1 Models Studied
- 9.2.2 Recommended Models
- 9.3 Models for Buildings on Relatively Level Grade [Go to Page]
- 9.3.1 Example Building
- 9.3.2 Model 1 for Example Building
- 9.3.3 Model 2 for Example Building
- 9.4 Models for Buildings on Sloping Grade [Go to Page]
- 9.4.1 Example Building
- 9.4.2 Model 2 for Example Building
- 17-ATC-144 Chapter 10 Conclusions and Recs_20201221_508 [Go to Page]
- 10.1 Overview
- 10.2 Conclusions
- 10.3 Other Helpful Resources
- 10.4 Comparison of SSI Provisions
- 10.5 Recommendations [Go to Page]
- 10.5.1 Recommendations for Code Developers [Go to Page]
- Technical Revisions
- Editorial Revisions
- 10.5.2 Recommendations for Further Study
- 18-ATC-144 App A Two-Story Example_20201202_508 [Go to Page]
- A.1 Overview [Go to Page]
- A.1.1 Outline of the Example
- A.1.2 Limitations in ASCE/SEI 7-16 Chapter 19
- A.2 Site Description
- A.3 Building Description [Go to Page]
- A.3.1 Gravity Framing
- A.3.2 Lateral Framing
- A.3.3 Gravity Loads and Seismic Weight
- A.3.4 Foundation System
- A.4 Initial Design [Go to Page]
- A.4.1 Base Shear per ASCE/SEI 7-16 Chapter 12 Equivalent Lateral Force Procedure
- A.4.2 Brace Design
- A.4.3 Foundation Design [Go to Page]
- A.4.3.1 Transverse Frame Foundation
- A.4.3.2 Longitudinal Frame Foundation
- A.4.4 Fixed-base Modal Analysis
- A.5 Flexible-base Analysis [Go to Page]
- A.5.1 Vertical Springs
- A.5.2 Lateral Springs
- A.5.3 Flexible-base Modal Analysis
- A.6 Foundation Damping [Go to Page]
- A.6.1 Soil Hysteretic Damping
- A.6.2 Radiation Damping
- A.6.3 Adjusted Base Shear
- A.6.4 Code-limited Adjusted Base Shear
- A.7 Design for SSI-Reduced Base Shear per ASCE/SEI 7-16 Chapter 19 [Go to Page]
- A.7.1 Brace Design
- A.7.2 Foundation Design
- A.7.3 Fixed-base Modal Analysis
- A.7.4 Flexible-base Modal Analysis
- A.7.5 Check of Base Shear
- A.8 Design for Full Theoretical SSI-Reduced Base Shear [Go to Page]
- A.8.1 Base Slab Averaging
- A.8.2 Brace Design
- A.8.3 Foundation Design
- A.8.4 Fixed-base Modal Analysis
- A.8.5 Flexible-base Modal Analysis
- A.8.6 Check of Base Shear
- A.8.7 Redesign (Iteration)
- A.8.8 Reanalysis
- A.8.9 Check of Base Shear
- 19-ATC-144_AppB_TallBuilding_20201202_508 [Go to Page]
- B.1 Overview [Go to Page]
- B.1.1 Outline of the Example
- B.2 Site Description [Go to Page]
- B.2.1 Geotechnical Properties
- B.2.2 Seismic Ground Motion Parameters
- B.3 Building Description [Go to Page]
- B.3.1 Framing Systems
- B.3.2 Material Properties and Modeling Criteria
- B.3.3 Gravity Loads and Seismic Mass
- B.4 Initial Design (Model 1) [Go to Page]
- B.4.1 Base Shear per Chapter 12 ELF
- B.4.2 Fixed-Base Modal Analysis
- B.4.3 Story Shears and Moments
- B.4.4 Story Drifts
- B.4.5 Foundation Design
- B.5 Spectral Modifications for Kinematic SSI [Go to Page]
- B.5.1 Base Slab Averaging
- B.5.2 Embedment
- B.6 SSI Adjusted Structural Demands [Go to Page]
- B.6.1 Period Elongation Due to Flexible Base
- B.6.2 Foundation Damping
- B.6.3 ELF Base Shear Adjusted for SSI
- B.6.4 Story Shears, Moments, and Drifts
- B.7 Design Variations [Go to Page]
- B.7.1 Building Without Basement, Fixed Base (Model 3)
- B.7.2 Building Without Basement, Flexible Base (Model 4)
- B.7.3 Sensitivity to Lower-Bound and Upper-Bound Spring Stiffnesses
- 20-ATC-144 AppC Helpful Resources_20201202_508
- 21-ATC-144 References_20201202_508 [Go to Page]
- CSI, 2016, SAP2000 Version 18.2, Computers and Structures, Inc., Walnut Creek, California.
- 22-ATC-144 Glossary AH20201106_508
- 23-ATC-144 Symbols AH20201106_508
- 24-ATC-144 Participants_20201202_508 [Go to Page]
- FEMA Oversight
- ATC Management and Oversight
- Project Technical Committee
- Project Review Panel
- Working Group Members
- 30-FEMAP-2091_BackCover_508
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page
- Blank Page [Go to Page]
