Building Seismic Safety Council NEHRP Recommended Seismic Provisions Update

Building Seismic Safety Council

2020 NEHRP Provisions Update Committee (PUC)

The NEHRP Recommended Provisions for New Buildings and Other Structures embodies the state–of–knowledge criteria for the design and construction of buildings subject to earthquake hazards. The techniques and technologies contained in this resource document are diffused into several national standards, including the American Society of Civil Engineers ASCE–7 Design Standard for Minimum Loads that are referenced by the model building codes developed by the International Code Council (ICC).

The Provisions are developed by the Provisions Update Committee (PUC) a technical committee of seismic experts that identify and apply the most advanced seismic technology available. The committee is supported by expert issue teams (ITs) that address specific aspects of seismic design methodology and construction. These committee and team members ensure that lessons learned from the building performance during the earthquakes, as well as new research to improve earthquake resistance, are reflected in state–of–the–art seismic requirements. The ITs develop proposals for requirements that are balloted by the PUC according to BSSC's consensus process, and subsequently balloted by the member organizations.

PUC Committee Members

Name Organization Role
Bonneville, David Degenkolb Engineers Chair
Carrato, Peter Bechtel Power Corporation Member
Cobeen, Kelly Wiss, Janney, Elstner Associates Member
Crouse, C.B. AECOM Member
Dolan, Dan Washington State University Member
Dutta, Anindya Simpson Gumpertz & Heger Member
Ghosh, S.K. S.K. Ghosh Associates Member
Gillengerten, John John Gillengerten Member
Hamburger, Ron Simpson Gumpertz & Heger Member
Harris, Jim James Harris & Associates Member
Holmes, William Rutherford & Chekene Member
Hooper, John Magnusson Klemencic Associates Member
Kasali, Gyimah Rutherford & Chekene Member
Kircher, Charles Charles Kircher & Associates Member
Line, Philip American Wood Council Member
Lizundia, Bret Rutherford & Chekene Member
Malley, James Degenkolb Engineers Member
Manley, Bonnie American Iron and Steel Institute Member
Pekelnicky, Robert Degenkolb Engineers Member
Sabelli, Rafael Walter P. Moore Member
Silva, John Hilti Member
Soules, Greg Chicago Bridge and Iron Company Member
Stewart, Jonathan University of California Los Angeles Member
Luco, Nico U.S. Geological Survey USGS Liaison
Rezaeian, Sanaz U.S. Geological Survey USGS Liaison
McCabe, Steven National Institute of Standards and Technology NIST Liaison
Collins, Jason PCS Structural Solutions Corresponding Member
Rodrigues–Merak, Adrian Virginia Tech Corresponding Member
Hanson, Robert Federal Emergency Management Agency (FEMA) Technical Advisor
Tong, Mai Federal Emergency Management Agency (FEMA) Project Officer
Yuan, Jiqiu (JQ) National Institute of Building Sciences (NIBS) BSSC Executive Director

PUC Meetings

April 16th – 18th

August 13th – 14th



PUC Issue Teams (ITs)

Work Scope

The IT1 main scope will be to evaluate the adequacy of the qualitative performance objectives in Section 1.1 of the provisions (not in currently ASCE-7) and determine if they are sufficient for the design of buildings and other structures. Moreover, the IT 1 will look at ASCE-7 Chapter 1 that is not currently in the Provision, and Provision Commentary Chapter 11, 12, 13, and 15 that are currently not in ASCE-7. Since there is a Project 17 task committee looking at the acceptable risk with regard to safety based on collapse of the structure, this issue team will focus on topics such as nonstructural performance, loss of function and potentially the level of damage. The committee will review the Resource Paper on future directions in performance based design from the 2015 Provisions and other applicable research projects related to performance-based design (ATC 58-2, ATC-84, ATC etc.). Other potential topics: non-structural performance, loss of function and potentially the level of damage, and the ATC 120 study funded by NIST. IT1 may look at R factor.

Membership

Role Name Organization Location
Chair Robert Pekelnicky Degenkolb Engineers San Francisco, CA
Voting Member Ibbi Amufti Arup San Francisco, CA
Voting Member David Bonneville Degenkolb Engineers San Francisco, CA
Voting Member Julie Furr Chad Stewart & Associates Lakeland, TN
Voting Member Ron Hamburger SIMPSON GUMPERTZ & HEGER San Francisco, CA
Voting Member Jim Harris James Harris & Associates Denver, CA
Voting Member Jon Heintz Applied Technology Council Redwood City, CA
Voting Member John Hooper Magnusson Klemencic Associates Seattle, WA
Voting Member Steve McCabe NIST Gaithersburg, MD
Voting Member Maryann Phipps Estructure Oakland, CA
Voting Member John Silva Hilti San Francisco, CA
Voting Member J.G. (Greg) Soules CB &I
USGS Liason Nico Luco USGS Golden, CO
Corresponding Member Kevin Moore SIMPSON GUMPERTZ & HEGER San Francisco, CA
Corresponding Member Daniel Dolan Washington State University Pullman, WA
Corresponding Member David Bonowitz David Bonowitz San Francisco CA
Corresponding Member Terry Lundeen COUGHLINPORTERLUNDEEN SEATTLE WA
Corresponding Member Rob Smith Arup San Francisco CA
Corresponding Member Jack Baker Stanford Palo Alto, CA
Corresponding Member John Gillengerten Self
Corresponding Member Philip Line American Wood Council Leesburg, VA

2017 Meetings

2016 Meetings

 

 

 

Work Scope

Consider adjustments to design coefficients and factors, including height limits, for seismic force resisting systems; the relationship between deflection amplification factor, response modification coefficient and drift limits; direction of loading requirements, including additional requirements for short period structures; and additional issues raised by or brought into the PUC. Coordinate with IT 1 on issues affecting Chapter 12, such as seismic design categories and multi-period spectra. The work product will be Part 1 proposals and Part 2 Commentary.

Membership

Role Name Organization Location
Chair Sandy Hohener Degenkolb Engineers Los Angeles, CA
Voting Member Kevin Moore Simpson Gumpertz & Heger San Francisco, CA
Voting Member Daniel Dolan Washington State University Pullman, WA
Voting Member Bret Lizundia Rutherford & Chekene San Francisco, CA
Voting Member Edwin Huston Smith & Huston Seattle, WA
Voting Member Tom Xia DCI Engineers Seattle, WA
Corresponding Member Bonnie Manley Steel Market Develop Insitute Norfolk, MA
Corresponding Member Taka Tamiya Degenkolb Engineers Los Angeles, CA
Corresponding Member Dan Sloat Degenkolb Engineers Seattle, WA
Corresponding Member Richard Bennett University of Tennessee Knoxville, TN
Corresponding Member Greg Soules
Corresponding Member Hussain Bhatia OSHPD Sacramento, CA
Corresponding Member Robert Tremblay Polytechnique Montreal, Canada

2016 Meetings

 


Work Scope

  • Possible adjustment of CS in the short period range by the square root of (2R/Ωo – 1)
  • Reduction by R only in the first mode (assuming higher modes are elastic);
  • Consideration (or reconsideration) of the appropriateness of current approaches for scaling to the results of an equivalent lateral force (ELF) analysis. This should include both the value matched (base shear, overturning moment, or other) and the scaling factor to be used for matching
  • Application of a multi-degree-of-freedom factor
  • Modification of MRSA to better target a probability of collapse of 1% in 50 years
  • Revisit triggers for Dynamic RSA in ASCE7 and realign with efforts of ATC 123

Membership

Role Name Organization Location
Chair Anindya Dutta SIMPSON GUMPERTZ & HEGER San Francisco, CA
Voting Member Jim Malley Degenkolb San Francisco, CA
Voting Member Bob Hanson Univ of Michigan Dublin, Ohio
Voting Member Jay Harris NIST Gaithersburg, MD
Voting Member Rafael Sabelli WALTER P MOORE San Francisco, California
Voting Member Kevin Aswegan Magnusson Klemencic Associates Seattle, Washington
Corresponding Member Jason Collins PCS Structural Solutions Seattle, WA
Corresponding Member Finley Charney Virginia Tech Blacksburg, Virginia
Corresponding Member Rob Tovani Computers and Structures, Inc. Walnut Creek, CA

2016 Meetings

 

Work Scope

The shear wall IT will consider the effects of external loads (gravity as well as lateral) on shear walls of concrete, steel, masonry, and wood. It will next consider the possible failure modes resulting from those load effects or internal forces. This will lead to a determination of the failure modes that are critical in design, which in turn should lead to possible areas of improvement in current design practice. Two of those areas are anticipated to be the following:

  1. Coupled shear wall systems are recognized as distinct from isolated shear wall systems in Canadian and New Zealand codes; they are also accorded higher response modification factors in view of their superior seismic performance. The IT will examine whether ASCE 7 should go in the same direction. (suggested by PUC: different R factor for coupled and isolated, need definition of coupled shear wall, ACI 318 will develop the definition, new items in 12.1. Ron Hamburger suggested P 695 study).

  2. Tall buildings in the 400-ft height range are increasingly being built in highly seismic areas, with seismic forces being resisted entirely by cores consisting of reinforced concrete shear walls. (suggested by PUC: cooperate with multi-period spectra team).

The shear design of these shear walls is absolutely crucial to the safety of these structures. However, we have at best an imperfect understanding of the maximum shear that can develop and how it is transferred at the base. It will be very beneficial for the IT to look into this design aspect.

The IT will develop Part 1 proposals and accompanying Part 2 commentary dealing with any topic on which the IT is able to progress to that point. All other findings of the IT and work leading to those findings will be recorded in a Part 3 Resource Paper.

Membership

Role Name Organization Location
Chair S.K. Ghosh S. K. Ghosh Associates Inc. Palatine, IL
Voting Member Jason Collins PCS Structural Solutions Seattle, Tacome, WA
Voting Member David Fields Magnusson Klemencic Associates Seattle, WA
Voting Member Kelly Cobeen Wiss, Janney, Elstner Associates, Inc. Emeryville, CA
Voting Member Dick Bennett University of Tennessee Knoxville, TN
Voting Member Gino Kurama University of Notre Dame Notre Dame, IN
Voting Member Andy Taylor KPFF Consulting Engineers Seattle, WA
Voting Member Michel Bruneau University of Buffalo Buffalo, NY
Corresponding Member Rafael Sabelli Walter P. Moore San Francisco, CA
Corresponding Member John Wallace University of California Los Angeles, CA
Corresponding Member Daniel Borello Oregon State University Corvallis, OR
Corresponding Member Bonnie Manley American Iron and Steel Institute Norfolk, MA
Corresponding Member Joe Maffei Maffei Structural Engineering Oakland, San Francisco, CA
Corresponding Member Tom Xia DCI Engineers Seattle, WA
Corresponding Member Dan Dolan Washington State University Pullman, WA
Corresponding Member John Hooper Magnusson Klemencic Associates Seattle, WA
Corresponding Member Laura Lowes University of Washington Seattle, WA
Corresponding Member Jose Restrepo University of California, San Diego La Jolla, CA
Corresponding Member Andrew Whittaker University of Buffalo Buffalo, NY
Corresponding Member Siamak Sattar NIST Gaithersburg, MD
Corresponding Member Dawn Lehman University of Washington Seattle, WA
Corresponding Member Philip Line American Wood Council Leesburg, VA
Corresponding Member Jack Moehle University of California, Berkeley

Berkeley, CA

Corresponding Member  Lawrence C. Novak Portland Cement Association Skokie, IL
Corresponding Member Joe Ferzli Cary Kopczynski & Company Bellevue, WA
Corresponding Member Jeff Berman The University of Washington

Seattle, WA

Corresponding Member Larry A. Fahnestock University of Illinois at Urbana-Champaign Urbana, IL
Corresponding Member Amit H. Varma Purdue University West Lafayette, IN

2018 Meetings

2017 Meetings

2016 Meetings

Work Scope

During the development of the 2015 NEHRP Provisions, there was extensive discussion on establishing performance objectives for nonstructural components. In addition, specific issues have been identified that significantly influence the performance of nonstructural components, but are not adequately covered in the current Provisions. With the exception of a review of Rp factors, all of the nonstructural items listed in the 2015 NEHRP Issues were research needs. NIST is supporting the ATC-120 project that directly addresses a substantial number of the research needs, including the force equations and performance objectives for nonstructural components.

Two of the areas of investigation in the second phase of ATC-120 are a detailed evaluation of the nonstructural design provisions, and development of performance objectives for nonstructural components. The detailed evaluation will include development of a design philosophy for nonstructural components that identifies desirable post-yield and failure mechanisms for components, supports and attachments, and a method for producing generic floor spectra for design of nonstructural components.

IT5 will incorporate information from ATC-120 to develop proposals for updating the force equations and nonstructural anchorage to concrete and masonry provisions to reflect the most current research, and proposals to update the Rp factors. Depending on the outcome of the ATC-120 effort on nonstructural performance objectives, IT5 will produce either a proposal or white paper.

Membership

Role Name Organization Location
Chair John Gillengerten SE, Retired OSHPD Hebron, KY
Voting Member Peter Carrato Bechtel Reston, VA
Voting Member Travis Churpalo Degenkolb Oakland, CA
Voting Member Bill Holmes R&C San Francisco, CA
Voting Member Bret Lizundia R&C San Francisco, CA
Voting Member John Silva Hilti San Rafael, CA
Voting Member Greg Soules CB&I Woodlands, TX
Voting Member Chris Tokas OSHPD Sacramento, CA
Corresponding Member Hussain Bhatia OSHPD Sacramento, CA
Corresponding Member Phil Caldwell Schneider
Corresponding Member Meaghan Halligan ISAT SF Bay Area
Corresponding Member Matthew Hoehler NIST Gaithersburg, MD
Corresponding Member Maryann Phipps Estructure Emeryville, CA
Corresponding Member Robert Simmons Petra Seismic Design Houston, TX
Corresponding Member Siavash Soroushian Arup San Francisco, CA

2018 Meetings

2017 Meetings

PUC Issue Teams (ITs)

BSSC Member Organizations

The Member Organizations (MOs) of the National Institute of Building Sciences Building Seismic Safety Council (BSSC) support the development of the 2020 NEHRP Recommended Provisions for New Buildings and Other Structures, which is intended for adoption into ASCE/SEI 7–22 and IBC 2024. The MOs will participate in the Provisions development process by balloting change proposals that are passed in Provisions Update Committee (PUC) ballots and approved by the BSSC Board of Direction.

Representative Organization
Nahlawi, Khaled American Concrete Institute
Haviland, Perry American Institute of Architects
Karrer, Paul American Institute of Architects
Kruth, Larry American Institute of Steel Construction
Manley, Bonnie American Iron and Steel Institute
Goupil, Jennifer American Society of Civil Engineers
Douglas, Bradford American Wood Council
Skaggs, Thomas APA – The Engineered Wood Association
Cagley, Jim Applied Technology Council
Simmons, Robert ASHRAE
Catlett, John Building Owners and Managers Association
Gould, Diane California Department of General Services – Division of the State Architect
Siggard, Kurt Concrete Masonry Association of California and Nevada
Mota, Mike Concrete Reinforcing Steel Institute
Archilla, Juan Department of Veterans Affairs
Earl, WIlliam General Services Administration
Brown, Remington Insurance Institute for Business and Home Safety
Pfeiffer, Mike International Code Council
Shoemaker, Lee Metal Building Manufacturers Association
Ehrlich, Gary National Association of Homebuilders
Roye, Brian National Concrete Masonry Association
Moore, Kevin National Council of Structural Engineers Associations
Kosmatka, Steve Portland Cement Association
Krohn, Jason Precast/Prestressed Concrete Institute
Azzi, Victor Rack Manufacturers Institute
Paul, Robert Steel Deck Institute
Xia, Tom Structural Engineer Association of Washington
Schinske, Don Structural Engineers Association of California
Palmer, David Structural Engineers Association of Central California
Jackson, Rob Structural Engineers Association of Colorado
Sfura, Jon Structural Engineers Association of Illinois
Wiley, Alan F. Structural Engineers Association of Kansas & Missouri
Miles, Ken Structural Engineers Association of Northern California
Caya, Heather Structural Engineers Association of San Diego
Ochoa, Dianne Structural Engineers Association of Southern California
Miller, Philip Structural Engineers Association of Utah
Samblanet, Philip Structural Engineers Association of Utah

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