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 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) • 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 (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 (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 (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 • 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 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 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 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 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 • 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 • 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 • Adoption of Chapter 16 discussed but not moved forward

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