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8/12/2019 _ASCE SEI 7-2005 Seismic Design Provisions, Overview
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2007 ASCE/SEI Structures CongressLong Beach
Seismic Design Provisionsof ASCE/SEI 7-2005
James R. Harris, S.E.Principal, JR Harris & Co.
Chair of the ASCE 7 Main Committee (2000-2005)
&
Robert E. Bachman, S.E.
Consulting Structural Engineer
Chair of the ASCE 7 Seismic Task Committee (2000-2005)
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Overview
Part I Bob Bachman
- Background on Code Change Development- Reorganization of ASCE 7-05 and where things are found
compared to ASCE 7-02 and the 1997 UBC
Part II Jim Harris- Basic Seismic Design Criteria for Buildings (Chapters 11-12)
Part III Bob Bachman- Nonstructural Components, Material Standards, Nonbuilding
Structures (Chapters 13 15)- Briefly discuss Chapters 16-22, Appendices 11A & B
- 2006 IBC Modifications to ASCE 7-05 Seismic Provisions
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OVERVIEW
Background on Seismic Code Development
Revised Organization for ASCE 7 2005
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Way back in 1994
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Seismic Codes and SourceSeismic Codes and SourceDocumentsDocuments
SEAOC
ASCE 7
NEHRP
StandardStandard
Building CodeBuilding Code
UniformUniform
Building CodeBuilding Code
BOCA NationalBOCA National
Building CodeBuilding CodeStandardStandard
Building CodeBuilding Code
UniformUniform
Building CodeBuilding Code
BOCA NationalBOCA National
Building CodeBuilding Code
International Building CodeInternational Building Code
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NEHRP ProvisionsATC 3.06
Tentative
Recommended
Provisions forSeismic Regulation
of Buildings
1997 EDITION
NEHRP RECOMMENDED PROVISIONS
FOR SEISMIC REGULATIONSFOR NEW BUILDINGS
AND OTHER STRUCTURES
PART 1 - PROVISIONS
1997 EDITION
NEHRP RECOMMENDED PROVISIONS
FOR SEISMIC REGULATIONSFOR NEW BUILDINGS
AND OTHER STRUCTURES
PART 2 - COMMENTARY
First published by BSSC in 1985
Was updated on 3-year cycle (1988, 91, 94, 97 ,00, 03) However now on 5 - 6 year cycle
1992 - Adopted by BOCA, SBCCI 1993 Adopted by ASCE 7 for Seismic
1995 - IBC resolves to adopt as basis for IBC
2008 Adopts ASCE-7-05 as Reference Basis
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National
Design
Specification
Load
&Resistance
Factor
Design
ACI
NEHRP & The Building Code
1997
UNIFORM
BUILDING
CODE
VOLUME 2
Recommended
Lateral Force
Requirements
and Commentary
1997 EDITION
NEHRP RECOMMENDED PROVISIONS
FOR SEISMIC REGULATIONSFOR NEW BUILDINGS
AND OTHER STRUCTURES
PART 1 - PROVISIONS
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Building Codes ChangedStarted in 2003
NFPA 5000
Building Code
ASCE-7
MinimumDesign Loads
for Buildings
and Other
Structures
National
Design
Specification
ACI
Load
&
Resistance
Factor
Design
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1997 UBC Development & Convergence
SEAOC notified in mid-1994 that the 1997 UBC would be the last
edition of the UBC. Replaced starting in 2000 IBC with Seismic Requirements based on
the 1997 NEHRP Provisions and Adopted Available Codes (UBC,SBC, NBC).
SEAOC recognized it likely could not overturn decision and adopted a
2 prong strategy- Nominated strong candidates to 1997 NEHRP PUC with concept ofmodifying the NEHRP to make closer to the anticipated 1997 UBC
- Made extensive revisions to 1997 UBC that brought them muchcloser to the anticipated 1997 NEHRP Provisions and also added new
concepts Strategy was called Convergence to ease the transition for thoseusing the UBC for seismic design after the IBC was adopted
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ICC , NFPA & The Governator
In 1998 1999 time frame, the International Code Council (ICC) and
National Fire Protection Association (NFPA) had a falling outprimarily dealing with plastic pipe.
NFPA decides to develop a competing building code called NFPA5000 which is favored by labor unions.
NFPA 5000 references ASCE 7-02 for engineering design
requirements Calif. Gov. Gray Davis stacks Cal. Building Standards Commission
and they adopt NFPA 5000 as next California Building Code (CBC)
SEAOC decides to support removal of seismic requirements from2003 IBC and instead references ASCE 7-02
Gray Davis impeached and replaced by the Governator who replacesthe Building Standards Commission (BSC) appointees.
New BSC adopts the 2006 IBC and in essence ASC7-05 for next CBC
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ASCE 7
Developed by ASCE-SEI using ANSI standard consensusprocess
Publication Date Varies (1993, 1995, 1998, 2002, 2005)
Latest Version ASCE 7-05 Including Supplement 1includes references to latest material standards
Errata go to www.seinstitute.org & click on publications& then click on errata & finally click on ASCE 7-05(current errata included in seminar handouts)
Participants:
ASCE/SEI Standards Committee Task Groups (Wind, Seismic, etc)
Public
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Vision of the Future Code evolution should slow somewhat
Next Edition of ASCE 7 in 2010/2011 standards are more difficult to change than codes ASCE 7-10/11 will be adopted by 2012 IBC
less rapid fire adoption of major changes
Design guidelines (SEAOC, etc) with informalconsensus approval available for elective use on
projects
However, IBC Code Supplements will still occurevery 18 months, with new full editions every 3years.
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Overview
Background on Seismic Code Development
Revised Organization for ASCE 7 2005
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ASCE 7-05 Reorganization
Goals of Seismic Section Reorganization
1. To improve clarity and use
2. Reduce depth of section numbering from
6 max typical to 4 max typical
(I.e. Sec. 9.5.2.5.2.2 is now Sec. 12.5.3)3. Simplify table and figure numbering
(I.e. Table 9.5.2.5.1 is now Table 12.6-1)
4. Create logical sequence of provisions aimed at thestructural engineering community
5. Improve headings and clarify ambiguous provisions
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ASCE 7-05 Reorganization Goals accomplished by:
1. Changing major subjects to Chapters rather than
Sections (similar to the IBC and UBC)2. Replacing Section 9 with Chapters 11-23
3. Incorporating the material appendices into thethe Chapters
4. Put the Chapters into a logical sequence
5. Rewrote ambiguous headings to reflect their content
6. Examined and rewrote sections to eliminate ambiguity
7. Provided Cross Reference Table C-11-102 to 058. Used code like format and printing style
9. And also adopted 2003 NEHRP Provision Changes
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Comparison of Contents
ASCE 7-2002 Sections
1. General
2. Combinations of
Loads3. Dead Loads
4. Live Loads
5. Soil and Hydrostatic
and Flood Loads
ASCE 7-2005 Chapters
1. General
2. Combinations of
Loads3. Dead Loads, Soil
and Hydrostatic
4. Live Loads
5. Flood Loads
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Seismic Contents
ASCE 7-2002
9.1 General Provisions
9.2 Definitions/Symbols
9.3 (not used)9.4 Ground Motion
9.5 Structural Design
Criteria, Analysis,and Procedures
ASCE 7-2005
11. Seismic Design
Criteria
12. Seismic DesignRequirements for
Building Structures
13. Seismic DesignRequirements for
Nonstructural Comp.
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Seismic Contents, continued
ASCE 7-2002
9.12 Wood
9.13 Seismic Isolation
9.14 NonbuildingStructures
A9. Quality Assurance
ASCE 7-2005
20. Site Classification
21. Site-Specific GroundMotions
22. Maps
23. Reference Docs
11A. Quality Assurance11B. Existing Buildings
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Seismic Contents Comparison
1997 UBC and ASCE 7-05
1997 UBC
1626 1628 General,Definitions, Glossary
1629.1 1629.4 CriteriaSelection
1629.5 1629.10, 1630,1631.1- 4, 1633 BuildingSeismic DesignRequirements
(Simplified Design notin 1997 UBC)
ASCE 7-2005
11. Basic Seismic DesignCriteria
11. Basic Seismic DesignCriteria
12. Seismic DesignRequirements for Bldgs.(no simplified analysis)
12.14 Simplified BuildingDesign
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Seismic Contents Comparison
1997 UBC and ASCE 7-05
1997 UBC
Figure 16-2 Seismic & Near
Source Maps
Chapter 17 Tests and
InspectionChapter 18 Foundations
Chapter 19-24 Materials
Chapter 34 Existing BldgsChapter 35 References
ASCE 7-2005
22. Contour maps and
website
Appendix 11A* QA
Section 12.13 Fndns
14. Materials*
Append. 11B* Existing Bldg23. References
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Seismic Contents Comparison1997 UBC and ASCE 7-05
1997 UBC
Appendix Chapter 16Seismic isolation
Not in 1997 UBC
Not in 1997 UBC
Not in 1997 UBC
ASCE 7-2005
17. Seismic Isolation
18. Systems with
Supplemental Damping
19. Soil Structure Interaction
21. Site Specific SeismicHazard Requirements.
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Summary Regarding Reorganization
California engineers have already beentransitioning to the NEHRP Requirements and
ASCE 7-05 when using the 1997 UBC
California engineers actually fortunate that theydid not have to use 2003 IBC and ASCE 7-02. The
reformat is much better for common usage
While terminology is different, the actual designrequirements are reasonably similar except for the
Central Valley This did not happen by accident.