The 2003 NEHRP Recommended Provisions
For New Buildings And Other Structures
Part 2: Commentary (FEMA 450)
TABLE OF CONTENTS
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for PDF files)
INTRODUCTION
Chapter 1 Commentary, GENERAL PROVISIONS
1.1 GENERAL
1.1.1 Purpose
1.2 SEISMIC USE GROUPS
1.2.5 Seismic Use group III structure access protection
1.3 OCCUPANCY IMPORTANCE FACTOR
1.4 SEISMIC DESIGN CATEGORY
1.4.2 Site limitation for Seismic Design Categories E and F
1.5 SEISMIC DESIGN CATEGORY A
1.5.1 Lateral forces
1.5.2 Connections
1.5.3 Anchorage of concrete or masonry walls
Chapter 2 Commentary, QUALITY ASSURANCE
2.1 GENERAL
2.1.1 Scope
2.2 GENERAL REQUIREMENTS
2.3 SPECIAL INSPECTION
2.3.9 Architectural components
2.3.10 Mechanical and electrical components
2.4 TESTING
2.4.5 Mechanical and electrical equipment
2.5 STRUCTURAL OBSERVATIONS
2.6 REPORTING AND COMPLIANCE PROCEDURES
Chapter 3 Commentary, GROUND MOTION
3.1 GENERAL
3.1.3 Definitions
3.2 GENERAL REQUIREMENTS
3.2.2 Procedure selection
3.3 GENERAL PROCEDURE
3.3.2 Site coefficients and adjusted acceleration parameters
3.3.4 Design response spectrum
3.4 SITE SPECIFIC PROCEDURE
3.4.2 Deterministic maximum considered earthquake
3.5 SITE CLASSIFICATION FOR SEISMIC DESIGN
3.5.1 Site class definitions
3.5.2 Steps for classifying a site
Chapter 4 Commentary, STRUCTURAL DESIGN CRITERIA
4.1 GENERAL
4.1.2 References
4.2 GENERAL REQUIREMENTS
4.2.1 Design basis
4.2.2 Combination of load effects
4.3 SEISMIC-FORCE-RESISTING SYSTEM
4.3.1 Selection and limitations
4.3.2 Configuration
4.3.3 Redundancy
4.4 STRUCTURAL ANALYSIS
4.4.1 Procedure selection
4.4.2 Application of loading
4.5 DEFORMATION REQUIREMENTS
4.5.1 Deflection and drift limits
4.5.3 Seismic Design Categories D, E, and F
4.6 DESIGN AND DETAILING REQUIREMENTS
4.6.1 Seismic design Category B
4.6.2 Seismic design Category C
4.6.3 Seismic Design Category D, E, and F
ALTERNATIVE SIMPLIFIED CHAPTER 4 Commentary
Chapter 5 Commentary, STRUCTURAL ANALYSIS PROCEDURES
5.1 GENERAL
5.2 EQUIVALENT LATERAL FORCE PROCEDURE
5.2.1 Seismic base shear
5.2.2 Period determination
5.2.3 Vertical distribution of seismic forces
5.2.4 Horizontal shear distribution
5.2.5 Overturning
5.2.6 Drift determination and P-delta effects
5.3 RESPONSE SPECTRUM PROCEDURE
5.3.2 Modes
5.3.3 Modal properties
5.3.4 Modal base shear
5.3.5 Modal forces, deflections and drifts
5.3.6 Modal story shears and moments
5.3.7 Design values
5.3.8 Horizontal shear distribution
5.3.9 Foundation overturning
5.3.10 P-delta effects
5.4 LINEAR RESPONSE HISTORY PROCEDURE
5.5 NONLINEAR RESPONSE HISTORY PROCEDURE
5.5.4 Design review
5.6 SOIL-STRUCTURE INTERATION EFFECTS
5.6.1 General
5.6.2 Equivalent lateral force procedure
5.6.3 Response spectrum procedure
APPENDIX to Chapter 5 Commentary, NONLINEAR STATIC PROCEDURE
Chapter 6 Commentary, ARCHITECTURAL MECHANICAL AND ELECTRICAL COMPONENT DESIGN REQUIREMENTS
6.1 GENERAL
6.1.1 Scope
6.2 GENERAL DESIGN REQUIREMENTS
6.2.2 Component importance factor
6.2.3 Consequential damage
6.2.4 Flexibility
6.2.5 Component force transfer
6.2.6 Seismic forces
6.2.7 Seismic relative displacements
6.2.8 Component anchorage
6.2.9 Construction documents
6.3 ARCHITECTURAL COMPONENTS
6.3.1 Forces and displacements
6.3.2 Exterior nonstructural wall elements and connections
6.3.3 Out-of-plane bending
6.3.4 Suspended ceilings
6.3.5 Access floors
6.3.6 Partitions
6.3.7 Glass I curtain walls, glazed storefronts and glazed partitions
6.4 MECHANICAL AND ELECTRICAL COMPONENTS
6.4.1 Component period
6.4.2 Mechanical components
6.4.3 Electrical components
6.4.4 Supports and attachments
6.4.5 Utility and service lines
6.4.6 HVAC ductwork
6.4.7 Piping systems
6.4.8 Boilers and pressure vessels
6.4.9 Elevators
Appendix to Chapter 6 Commentary, ALTERNATIVE PROVISIONS FOR THE DESIGN OF PIPING SYSTEMS
Chapter 7 Commentary, FOUNDATION DEIGN REQUIREMENTS
7.1 GENERAL
7.1.1 Scope
7.2 GENERAL DESIGN REQUIREMENTS
7.2.2 Soil capacities
7.2.3 Foundation load-deformation characteristics
7.3 SEISMIC DESIGN CATEGORY B
7.4 SEISMIC DESIGN CATEGORY C
7.4.1 Investigation
7.4.2 Pole-type structures
7.4.3 Foundation ties
7.4.4 Special pile requirements
7.5 SEISMIC DESIGN CATEGORIES D, E, and F
7.5.1 Investigation
7.5.3 Foundation ties
7.5.4 Special pile and grade beam requirements
Appendix to Chapter 7 Commentary, GEOTECHNICAL ULTIMATE STRENGTH DESIGN OF FOUNDATIONS AND FOUNDATION LOAD-DEFORMATION MODELING
Chapter 8 Commentary, STEEL STRUCTURE DESIGN REQUIREMENTS
8.1 GENERAL
8.1.2 References
8.2 GENERAL DESIGN REQUIREMENTS
8.2.1 Seismic Design Categories B and C
8.2.2 Seismic Design categories D, E, and F
8.4 COLD-FORM STEEL
8.4.2 Light-frame walls
8.4.4 Steel deck diaphragms
8.5 STEEL CABLES
8.6 RECOMMENDED PROVISIONS FOR BUCKLING-RESTRAINED BRACED FRAMES
8.6.3 Commentary on buckling-restrained braced frames
8.7 SPECIAL STEEL PLATE WALLS
8.7.3 Scope
8.7.4 Webs
8.7.5 Connections of webs to boundary elements
8.7.6 Horizontal and vertical boundary elements (HBE and VBE)
Chapter 9 Commentary, CONCRETE STRUCTURE DESIGN REQUIREMENTS
9.1 GENERAL
9.1.2 References
9.2 GENERAL DESIGN REQUIREMENTS
9.2.1 Classification of shear walls
9.2.2 Modifications to ACI 318
9.3 SEISMIC DESIGN CATEGORY B
9.3.1 Ordinary moment frames
9.4 SEISMIC DESIGN CATEGORY C
9.5 SEISMIC DESIGN CATEGORIESD, E, AND F
9.6 ACCEPTANCE CRITERIA FOR SPECIAL PRECAST STRUCTURAL WALLS BASED ON VALIDATION TESTING
9.6.1 Notation
9.6.2 Definitions
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