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John Hooper, PE, SE Chair, ASCE 7 Seismic Subcommittee

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Translating the 2009 NEHRP Provisions into ASCE/SEI 7-10 Presented at the 2010 BSSC Annual Meeting/Workshop. John Hooper, PE, SE Chair, ASCE 7 Seismic Subcommittee. Code Development Process. Research Results / Lessons Learned. Joint Correlating Committee. Industry Standards.

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Translating the 2009 NEHRP Provisions into ASCE/SEI 7-10Presented at the 2010 BSSC Annual Meeting/Workshop

John Hooper, PE, SE

Chair, ASCE 7 Seismic Subcommittee

code development process
Code Development Process

Research Results /

Lessons Learned

Joint

Correlating Committee

Industry Standards

FEMA Guidance

(NEHRP Provisions )

(major?)

(major)

CRSC

(reality check)

ASCE/SEI Standards

(7, 31 and 41)

(minor?)

(minor)

International Codes

(reality)

asce 7 seismic subcommittee ssc
ASCE 7 Seismic Subcommittee (SSC)
  • Comprised of over 50 Members
  • Essentially a “Balanced” Committee
  • Organized by Technical Committees (TC)
  • Reports to ASCE 7 Main Committee
  • Follows ANSI Consensus Process
  • Coordinated Efforts with Material Standards
asce 7 seismic subcommittee ssc1
ASCE 7 Seismic Subcommittee (SSC)
  • TC-1 Ground Motions—C.B. Crouse
  • TC-2 General Provisions—Jon Kiland
  • TC-3 Foundations/Site Conditions—Martin Johnson
  • TC-4 Concrete—Neil Hawkins
  • TC-5 Masonry—Jason Thompson/Phil Samblanet
  • TC-6 Steel & Composite Structures—Rafael Sabelli/Bonnie Manley
asce 7 seismic subcommittee ssc2
ASCE 7 Seismic Subcommittee (SSC)
  • TC-7 Wood & Light-Framed Structures—Phil Line
  • TC-8 Non-Structural Components—John Silva
  • TC-9 Administrative & QA Provisions—Jon Siu
  • TC-12 Seismic Isolation & Damping—Andrew Whittaker
  • TC-13 Non-Building Structures—Greg Soules
  • Ad-hoc Anchorage Task Group—Jim Harris
  • Ad-hoc Ground Motion Task Group—Charlie Kircher
asce 7 seismic subcommittee ssc3
ASCE 7 Seismic Subcommittee (SSC)
  • Process Affected by ICC Schedule Change
  • Coordinated Efforts with Material Standards to the Extent Possible (Chapter 14 “Clean-up”)
  • Processed over 200 Proposals
2009 provisions proposals translated part 1
2009 Provisions Proposals Translated—Part 1
  • Ground Motion Maps and Terminology (to be covered by Nico Luco)
  • Geologic Hazards and Geotechnical Investigations
    • Section 11.8 was updated consistent with Provisions language
    • Includes new PGA maps
    • Introduced MCEG terminology to distinguish “geo-mean” values from risk-targeted MCER values
2009 provisions proposals translated part 11
2009 Provisions Proposals Translated—Part 1
  • Table 12.2-1—Items Changed
    • Ordinary reinforced AAC masonry shear walls
    • Plain AAC masonry shear walls
    • Cold-formed steel special bolted frame
  • Table 12.2-1
    • Consolidation of EBF and BRBF into one system for each
2009 provisions proposals translated part 12
2009 Provisions Proposals Translated—Part 1
  • Table 12.6-1, Permitted Analytical Procedures
    • Simplified table in a similar fashion
    • Included 160-foot height as part of the check
  • Transfer of Diaphragm Proposal, Along with Other External Proposals, Resulted in Ad-hoc Anchorage Task Group
2009 provisions proposals translated part 13
2009 Provisions Proposals Translated—Part 1
  • Chapter 14, Material Specific Design and Detailing Requirements
    • Many of the suggested changes were adopted
  • Table 15.4.2—Items Changed
    • Separate line item for chimney and stacks was added
2009 provisions proposals translated part 14
2009 Provisions Proposals Translated—Part 1
  • Section 15.7.6, Ground-Supported Storage Tanks for Liqueds
    • Exception for determining site-specific Sac was added
  • Section 16.1.3.2 Three-Dimensional Analysis
    • Similar changes to the scaling requirements were incorporated
2009 provisions proposals not translated part 1
2009 Provisions Proposals NOT Translated—Part 1
  • Section 12.8.7 P-Delta Limits
  • Section 12.11.2.2.1, Transfer of Anchorage Forces into Diaphragm
  • Section 12.14.7.5.1, Transfer of Anchorage Forces into Diaphragm
2009 provisions proposals translated part 2
2009 Provisions Proposals Translated—Part 2
  • Develop Commentary to ASCE 7-05
    • Completion date: 4th quarter 2010
  • Develop Commentary to ASCE 7-10
    • Use ASCE 7-05 Commentary as a basis
    • Add commentary for the changes associated with ASCE 7-10
    • Completion date: not yet determined
2009 provisions proposals translated part 3
2009 Provisions Proposals Translated—Part 3
  • Adoption of Chapter 16 discussed but not moved forward
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