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

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John hooper pe se chair asce 7 seismic subcommittee

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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