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SEAOC 2017 Convention Proceedings

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The Proceedings contain the following unedited papers presented by the authors at the 2017 SEAOC Convention on September 12-15 in San Diego, CA.  These papers reflect the opinions, positions, and commentary of the authors and do not represent a consensus viewpoint of the Structural Engineers Association of California.  The material presented in this publication should not be used or relied upon for any specific application without competent examination and verification of its accuracy, suitability, and applicability by qualified professionals.  This document is not intended, nor should it establish or define a “standard of care” or a “standard of practice.”  Users of information from this publication assume all liability from such use.


A Comparison of Different Methods to Design Cast-in-Place Concrete Diaphragms for Seismic Load

Rahul Sharma, P.E.,
Jeremiah Legrue, S.E., and
Doug Hohbach, S.E., Hohbach-Lewin, Inc., Palo Alto, CA


Apple Park Precast – Integrated Architecture, Structure, and Mechanical Services in a Long Span Floor System

 Glen A. Underwood, S.E., Clark Pacific, West Sacramento, California
John Worley, S.E., Arup, San Francisco, California


ASCE 7 R-Values in Soft-Story Building Retrofits

 Bruce Maison, SE, Consulting Engineer, El Cerrito, CA
Keith Palmer, PE, Simpson Gumpertz & Heger, San Francisco, CA
Thor Matteson, SE, Consulting Engineer, Berkeley, CA
Brian Olson, SE, Earthquake Engineering Solutions, Oakland CA


ATC-58-2: Probabilistic Performance-based Seismic Assessment and Design Guidelines

 Ronald O. Hamburger, SE, Senior Principal, Simpson Gumpertz & Heger Inc., San Francisco, CA


Building Community Partnerships through Strategic Outreach: the SEAOSC Strengthening Our Cities Summit and Safer Cities Survey

David Cocke, SE,
Jeff Ellis, SE, 
Michelle Kam-Biron, SE, 
Annie Kao, PE, and
Victoria Wigle, SE Structural Engineers Association of Southern California Los Angeles, CA


Case Study: Cost Delta for Achieving Higher Structural Performance Levels

Kamalpreet Kalsi, Project Engineer, and
Daniel Zepeda, Principal, Degenkolb Engineers Los Angeles, CA


Consensus Recommendations for “Soft Story” Retrofit

David Bonowitz, S.E. 
Daniel Zepeda, S.E.


Considerations for a Framework of Resilient Structural Design for Earthquakes

Josh Gebelein Brandow & Johnston, Inc., Matt Barnard Degenkolb Engineers
Henry Burton University of California, Los Angeles
Michael Cochran Thornton Tomasetti
Curt Haselton California State University, Chico
Russell McLellan Simpson Gumpertz & Heger
Keith Porter University of Colorado, Boulder


Damage Tolerant Braced Frame Designs

Ralph M. Richard, Professor Emeritus University of Arizona Tucson, Arizona 
Rudolph E. Radau, President ROM Engineering, Inc. Tucson. Arizona 
C. Jay Allen, V.P., Sales and Engineering Schuff Steel Company Phoenix, Arizona


Delivering the GigaFactory in Tesla Time Using HD BIM

Gregory P. Luth, Ph.D. S.E. 
John D Osteraas, Ph.D., S.E.


Design of Chevron Gusset Plates

Rafael Sabelli, Director of Seismic Design, Walter P Moore, San Francisco, California
Leigh Arber, Senior Engineer, American Institute of Steel Construction, Chicago, Illinois


Dynamic Testing of Structures with Ductile Anchorages: A Comparison of Superstructure and Base Connection Plasticity

Tara C. Hutchinson, Professor University of California, San Diego, La Jolla, CA
Chris Trautner, Structures Engineer Space Exploration Technology, Hawthorne, CA


Earthquake and Post-Earthquake Fire Performance of a Midrise Cold-Formed Steel Framed Building

Tara Hutchinson, 
Xiang Wang, and
Gil Hegemier, University of California, San Diego, La Jolla, CA
Brian Meacham, and
Praveen Kamath, Worcester Polytechnic Institute, Worcester, MA
Fernando Sesma, California Expanded Metals Co. (CEMCO), City of Industry, CA
Kelly Holcomb, Sure-Board/Intermat, Inc., CA


An Economical Approach to Floor Vibration through Appropriate Design Criteria and Analytical Methods

Jeffrey Keileh, PE, SE, LEED AP BD+C, Associate

Mark Sarkisian, PE, SE, LEED, Partner
Skidmore, Owings & Merrill LLP
San Francisco, California


Engagement and Equity in Structural Engineering: The SEAONC SE3 Committee’s Ongoing Work

2016-17 SEAONC SE3 Committee San Francisco, CA


Enhanced Seismic Design of the New San Diego Central Courthouse

Mark Sarkisian, PE, SE, Partner
Peter Lee, PE, SE, Associate Director
Rupa Garai, PE, SE, Associate Director and
Alvin Tsui, PE, SE, Associate, Skidmore, Owings & Merrill LLP, San Francisco, CA


Example Application Guide for ASCE/SEI 41-13, Seismic Evaluation and Retrofit of Existing Buildings

Bret Lizundia, Executive Principal, Rutherford + Chekene, San Francisco, CA
Michael Braund, Principal, Degenkolb Engineers, San Diego, CA
Jim Collins, Executive Vice President, PCS Structural Solutions, Tacoma, WA
Andrew Herseth, Physical Scientist, FEMA, Washington, DC
William Holmes, Senior Consultant, Rutherford + Chekene, San Francisco, CA
Ayse Hortacsu, Director of Projects, ATC, Redwood City, CA
Ron LaPlante, California Division of the State Architect, San Diego, CA
Michael Mahoney, Senior Geophysicist, FEMA, Washington, DC
Brian McDonald, Principal Engineer, Exponent, Menlo Park, CA
Mark Moore, Executive Principal, ZFA Structural Engineers, San Francisco, CA


First USRC-Rated Building: Roseville City Hall Annex

Ryan A. Kersting, S.E., Associate Principal, and 
Brian S. Wiens, S.E., Senior Associate Buehler & Buehler Structural Engineers, Inc. Sacramento, California


High-Rise Pre-Northridge Partial Joint Penetration Column Splice Repair

Michael P. Chisholm, P.E. 
Robert G. Pekelnicky, S.E., and 
James O. Malley, S.E., Degenkolb Engineers, San Francisco, CA


Hotel Churchill: Using Dampers Strategically

Eric T. Lehmkuhl, Principal, 
Aaron Pebley, Associate, and
Shaun Walters, Project Manager, KPFF Consulting Engineers, San Diego, CA


Implementing the City of San Francisco’s Wood-Framed, Soft Story Retrofit Ordinance

Randy Collins, S.E., Principal, Founder, 
John A. Dal Pino, S.E., Principal, 
Nik Favretto, P.E., Associate, 
Nadia Makoor, Designer, and 
Brenna Marcoux, Designer, FTF Engineering, Inc., San Francisco, California


Improved Seismic Design of Nonstructural Components and Systems (ATC-120)

Maryann Phipps, S.E., Estructure, Oakland, CA
John Gillengerten, S.E., Consulting Engineer, Hebron, KY
Bret Lizundia, S.E., Rutherford + Chekene, San Francisco, CA
Ricardo Medina, PhD, PE, University of New Hampshire, Durham, NH
Eduardo Miranda, PhD, Stanford University, Palo Alto, CA
Robert Pekelnicky, S.E., Degenkolb Engineers, San Francisco, CA


Influence of Nonstructural Components and Systems (NCS) on the Dynamic Behavior of Buildings

Alec Zavala, MS, and
Steven Tipping, SE, Tipping Structural Engineers, Berkeley, CA
Cole McDaniel, Ph.D., 
Peter Laursen, Ph.D., and
Graham Archer, Ph.D., California Polytechnic State University, San Luis Obispo, CA


The Kaikoura Earthquake and its effects on some Wellington CBD Buildings

Paul Campbell, Technical Director Opus International Consultants, Immediate Past President Structural Engineering Society New Zealand 
John Snook, Executive Officer Structural Engineering Society New Zealand


Lessons from Stadium Structures in Seismic Zones

Rafael Sabelli, Director of Seismic Design Walter P Moore San Francisco, California Laura Whitehurst, Senior Project Engineer Holmes Consulting Wellington, New Zealand


Metropolis Mega-Development: A Case Study in Fast-Tracked Performance-Based Seismic Design of High-Rise Concrete Towers in Los Angeles

Saiful Islam, Ph.D. S.E.,
Sampson Huang, Ph.D. S.E., 
Shafiq Ibrahim, P.E., and 
Fengshuang (Rex) Zhang Saiful/Bouquet Structural Engineers Pasadena, CA


New Criteria for use of Nonlinear Dynamic Analysis in Design ASCE 7-16 and PEER TBI VII

Ronald O. Hamburger, SE, Senior Principal, Simpson Gumpertz & Heger Inc., San Francisco, CA
Jack P. Moehle, PhD, PE, Ed & Diane Wilson Professor Structural Engineering, University of California at Berkeley


New Methods in Efficient Post-Tensioned Slab Design Using Topology Optimization

Mark Sarkisian PE, SE, Partner, 
Eric Long PE, SE, Director, 
Alessandro Beghini PE, SE, Associate Director, 
Rupa Garai PE, SE, Associate Director, 
David Shook PE, Associate Director, 
Abel Diaz PE, SE, Associate, and 
Ricardo Henoch PE Skidmore, Owings & Merrill LLP San Francisco, CA


New Site-Specific Ground Motion Requirements of ASCE 7-16

Charles A. Kircher, Ph.D., P.E., Principal, Kircher & Associates, Consulting Engineers, Palo Alto, California


One Step Closer to a Seismically Resilient Community: Summary and Comparison of the Seismic Retrofit Ordinances of Southern California

Daniel Zepeda, SE, Principal, Degenkolb Engineers Los Angeles, CA
Jeff Roi, SE, Associate, Degenkolb Engineers Los Angeles, CA
Johnathan Buckalew, SE, Project Engineer, Nabih Youssef San Francisco, CA


Ownership Transition: Build Teams, Not Walls

Bill Mandel, Partner Fox Rothschild LLP San Francisco, CA


Performance Based Seismic Design of the Gigafactory in Tesla Time

John Osteraas, Ph.D., P.E., Principal Engineer and
Jeffrey Hunt, Ph.D., P.E., Managing Engineer Exponent, Inc. Menlo Park, CA
Gregory Luth, Ph.D., S.E., President Gregory P. Luth & Associates Santa Clara, CA


Practical Implementation of ASCE-41 and NLRHA Procedures for the Design of the LLUMC Replacement Hospital

Gregory Nielsen PE, 
Simon Rees SE, 
Branden Dong PE, 
Kermin Chok SE,
Eaman Fatemi, and
Atila Zekioglu SE, Arup, Los Angeles, CA


Prestandard for Seismic Assessment and Retrofit of One- and Two-Family Dwellings (ATC-110 Project)

Colin Blaney, Structural Engineer, Buehler & Buehler, San Carlos, California
Kelly Cobeen, Structural Engineer, Wiss Janney Elstner Assoc., Emeryville, California
Andre Filiatrault, Professor, State University of New York, Buffalo, New York
David P. Welch, Post-Doctoral Researcher, Stanford University, Stanford, California
Michael Stoner, Graduate Student, Clemson University, Clemson, South Carolina
Weichiang Pang, Professor, Clemson University, Clemson, South Carolina
Taylor Vincent, Graduate Student, Washington State University, Pullman, Washington


Proportioning Strength to Limit Building Movements of Slender Core-Only Towers

Mark Sarkisian, SE, Partner, 
Eric Long, SE, Director, 
David Shook, PE, Associate Director, and
Francesco Ranaudo Skidmore, Owings & Merrill LLP San Francisco, California


Realistic Seismic Behavior of the Main Tower of the New SAS Bay Bridge and Its Base Anchors

Abolhassan Astaneh-Asl, Ph.D., P.E., 
Professor Xin Qian, Doctoral Graduate Student, and
Maryam Tabbakhha, Ph.D., Lecturer University of California Berkeley, Berkeley


Seismic Evaluation of Older Concrete Frame, Frame-wall, and Bearing Wall Buildings for Collapse Potential—ATC 78

William T. Holmes, SE, NAE, Rutherford + Chekene, San Francisco, CA
Abbie Liel, PE, Ph.D., University of Colorado, Boulder, CO
Mike Mehrain, SE. Ph.D., Mehrain Naeim International, Los Angeles, CA
Jack Moehle, PE, Ph.D, NAE, University of California, Berkeley, CA
Peter Somers, SE, Magnusson Klemencic Associates, Seattle, WA
Jon Heintz, SE, Applied Technology Council, Redwood City, CA


Seismic Retrofit Design of a Multi-Story Non-Ductile Reinforced Concrete Building in Downtown Los Angeles

Hugo Gomez, Ph.D., P.E., Project Engineer
Erik McGregor, P.E., C.PEng., Project Engineer
Nina Mahjoub, P.E., LEED AP, Associate Principal
Dan Bech, S.E., Principal, and 
Bill Tremayne, S.E., Technical Director & Principal, Holmes Structures, San Francisco, CA


Seismic Retrofit and FEMA P-58 Risk Assessment of Mid-rise Soft-story Concrete Towers

Kit Miyamoto, Ph.D., S.E., 
Amir SJ Gilani, Ph.D., S.E. and 
Lon Determan, S.E. Miyamoto International Los Angeles, CA


Seismic Upgrade of a One-Story Pre-Northridge Moment Frame Hospital Building by Attaching Its Roof Diaphragm to a Newly Constructed Concrete Shear Wall Building with Friction Dampers

Dihong Shao, S.E. Principal Coffman Engineers, Inc. Seattle, Washington
Brian Walkenhauer, S.E. Engineer Coffman Engineers, Inc. Seattle, Washington
Reza Shafiei, P.E. Engineer Seattle, Washington


Seismically-Resilient Stair Systems for Buildings

Cameron J. Black, Ph.D. P.E., and
Associate Ian D. Aiken, Ph.D. P.E. Principal Seismic Isolation Engineering, Inc. Berkeley, CA
Kevin W. Smith, P.E., and
Robert J. Belvin, P.E. Anthony J. Peachey Construction Specialties, Inc. Muncy, PA


Strategies for Mitigating Floor Vibrations – Case Studies for Practicing Engineers

Wayne Brown, S.E., Associate Peter Carlson, S.E., Associate Principal Miyamoto International San Diego, CA
Reza Kashani, PhD, P.E., Principal DEICON Inc. Dayton, OH


A Summary of Significant Updates in ASCE 41-17

 Robert Pekelnicky, SE Degenkolb Engineers San Francisco, CA
Garrett Hagen, SE Degenkolb Engineers Los Angeles, CA
Dave Martin, PE Degenkolb Engineers Oakland, CA


Sustainable Design: It’s the Least You Can Do!

Lisa Podesto, PE
Megan Stringer, SE
Karyn Beebe, PE
Nick Pauli, PE
Ryan Miller, SE
Josh Pilorin, PE
Anthony Court, SE
Sustainable Design Committees


The Tallest Wood Building in the World UBC Brock Commons Student Residence Base 3D Model to Product Delivery

Kris Spickler, P.E. Principal, Heavy Timber Group Inc, Granite Bay, California
Nicholas Sills, M.Sc., Structurlam Products LP, Penticton, British Columbia


Updated Basis for National Seismic Design Value Maps

Ronald O. Hamburger, SE, Senior Principal, Simpson Gumpertz & Heger Inc., San Francisco, CA


Updating the ASCE 41 Provisions for Infilled RC Frames

Andreas Stavridis, Assistant Professor, 
Jimena Martin Tempestti, Graduate Student, and
Supratik Bose, Graduate Student University at Buffalo Buffalo, New York


Wind Committee Status Report: Wind Design Manual and Updated PV2-2017 Paper

Stephen Kerr, S.E. SEAOC Wind Committee San Diego, CA


Wind Loads on Non-Building Structures

Emily Guglielmo, SE, Martin/Martin, Inc., Larkspur, California