Task - 1 Establish the Tall Buildings Project Advisory Committee
Task 1 – Establish the Tall Buildings Project Advisory Committee
Task description – Select members for the T-PAC, including experts and representatives from the seismology, geotechnical engineering, structural engineering, and building regulation communities. Convene the T-PAC to initiate the project, define operating procedures, and advise on scope, tasks, and investigators. Meet on a regular basis to review ongoing work and recommend revisions in tasks as well as recommend new tasks. Seek expanded participation and funding as appropriate. Serve as an overall project quality control board, ensuring that main findings of this project have achieved consensus of the T-PAC prior to release.
Lead investigator – Jack Moehle
Team members – In addition to the lead investigator;
- Yousef Bozorgnia (Project Manager, PEER);
- Paul Somerville (SCEC);
- Marshall Lew (LATBSDC);
- Nic Rodriguez (SEAOC);
- Ray Lui (SFDBI);
- Norm Abrahamson, Ron Hamburger, Helmut Krawinkler, and Farzad Naeim (experts at large)
Status – Active
Task 2 - Develop Consensus on Performance Objectives
Task 2 – Develop Consensus on Performance Objectives
Task description – Using an appropriate methodology, develop a consensus on performance objectives. Some emphasis on residential construction, i.e., condominiums, but including other occupancies. Document methodology and performance objectives in a final report. Basic performance objective to be the minimum performance specified in the building code, but this project has an assignment of defining specifically what that performance objective is. Considered performance objectives should include conventional performance objectives and alternative ways of expressing objectives. Alternative performance considerations may include reparability and reoccupancy. Final objectives should clearly define confidence levels associated with objectives. An analysis of socio-economic impacts associated with tall building performance should be considered.
Lead investigator – Bill Holmes
Team members – Charlie Kircher, Laurence Kornfield, Bill Petak, and Nabih Youssef, plus contributions from position paper writers and workshop attendees as appropriate.
Status – Completed
Task 2 Final Report
- PEER 2008/101 – Seismic Performance Objectives for Tall Buildings (PDF file – 5.3 MB)
Task 2 Workshop Documents – April 18, 2007
- Description and Purpose of Task 2 (PDF file – 100 KB)
- Summary of Survey Results (PDF file – 144 KB)
- Interview Process (PDF file – 132 KB)
- Background of Seismic Codes and Performance Expectations (PDF file – 17.6 MB)
Task 3 - Baseline Assessment of Dynamic Response Characteristics of Tall Buildings
Task 3 – Assessment of ground Motion Selection and Modification Procedures
Task description – Conduct analyses of multistory building models subjected to a large number of earthquake ground motions to determine the native statistics of the responses, compare results with results obtained using various proposed ground motion selection and modification procedures, and recommend appropriate ground motion selection and scaling procedures. Work to be conducted in coordination with the PEER working group on ground motion selection and scaling. Buildings models to include two core wall models (of different heights) and two frame models (of different heights). Building models preferably based on actual building projects, preferably the models (slightly modified) from the actual projects. Collect statistics on important design parameters including roof drift, interstory drift, floor accelerations, moment profiles, shear profiles, collector forces, etc. Identify ground motion parameters that correlate best with response quantities. Recommend selection and scaling procedures for design.
Lead investigator – Jack Moehle
Team members – John Hooper, Stephen Mahin, Tony Yang, Tea Visnjic
Status – Active
Task 4 - Synthetically Generated Ground Motions
Task 4 – Synthetically Generated Ground Motions
Task description – Using validated broadband ground motion simulation procedures, generate ground motion time histories in San Francisco and Los Angeles for large earthquakes on the major faults in the region. The time histories will be simulated for geographic areas of specific interest for San Francisco and Los Angeles. These broadband simulated time histories are to contain long period effects such as rupture directivity effects and basin effects that are specific to the fault geometry and geological structure of the regions.
Lead investigator – Paul Somerville
Team members – Brad Aagaard, N. Collins, Rob Graves
Task 5 - Review and Validation of Synthetically Generated Ground Motions
Task 5 – Review and Validation of Synthetically Generated Ground Motions
Task description – Conduct review of procedures and results obtained in Task 4, with purpose of establishing a validated reference set of synthetically generated broadband ground motions. Work closely with researchers in Task 4 to ensure the final results are based on the best available technologies and assumptions, and are properly interpreted. Develop final report documenting procedures used to generate motions as well as validation procedures. Provide digital set of validated synthetic ground motions.
Lead investigators – Farzad Naeim and Yousef Bozorgnia
Team members – N. Abrahamson, B. Chiou, CB Crouse, D. Dreger, J. Hooper, N. Luco, J. Maffei, Y. Moriwaki, Y. Zeng
Related Documents
- Validation Against NGA Empirical Model of Simulated Motions ror M7.15 Rupture of Puente Hills Fault – Jonathan P. Stewart, Lisa M. Star, and Robert W. Graves (PDF file – 339 KB)
Task 6 - Guidelines on Selection and Modification of Ground Motions
Task 6 – Guidelines on Selection and Modification of Ground Motions for Design
Task description – Using findings from Tasks 3 through 5, write guidelines for selection and modification of ground motions for design of tall buildings. Apply recommendations to virtual sites in San Francisco and Los Angeles to demonstrate procedures and to establish a sample set of validated ground motions that can be used in subsequent research or for design of tall buildings.
Lead investigators – Yousef Bozorgnia and Nico Luco
Team members – Farzad Naeim, John Hooper, Norm Abrahamson, Joe Maffei
Task 7 - Guidelines on Modeling and Acceptance Values
Task 7 – Guidelines on Modeling and Acceptance Values
Task description – Develop practical guidance for nonlinear modeling of tall buildings in reinforced concrete (priority), steel, and composite construction. Conduct workshop to identify critical issues in tall buildings modeling and acceptance values, rather than covering the entire field. Identify researcher/practitioner teams to review the literature and conducted limited analyses to identify appropriate procedures. Methodology and findings to be documented in final report. Include recommendations for stiffness, strength, deformation capacity, hysteretic models, and implementation in software for nonlinear dynamic analysis. Provide guidance on appropriate use of overstrength parameters, capacity reduction parameters, etc. for capacity design. Work with experienced consultants to ensure focus on key components and systems that affect earthquake response and design, including modeling of podium force transfer. As appropriate, conduct analyses to validate procedures.
Lead investigator – James Malley
Team members – Jon Heintz, Greg Deierlein, Helmut Krawinkler, Joe Maffei, Mehran Pourzanjani, John Wallace, and others as needed.
Status – Complete
Task 7 Final Report
PEER 2010/111 – Modeling and Acceptance Criteria for Seismic Design and Analysis of Tall Buildings (pdf 5.7 MB)
This final report was jointly published by PEER as Report no. 2010/111 and by ATC as PEER/ATC 72-1.
Task 8 - Input Ground Motions for Tall Buildings with Subterranean Levels
Task 8 – Input Ground Motions for Tall Buildings with Subterranean Levels
Task description – Prepare interim report describing the state of the art and practice for definition and input of ground motions for tall buildings with embedded foundations. Define additional needed studies as appropriate. Rely on past analytical and empirical studies. Work with experienced engineers familiar with tall building configurations and analysis procedures. Also, identify any other major issues to be investigated for foundation design of tall buildings.
Lead investigator – Jon Stewart
Team members – C.B. Crouse, M. Lew, F. Ostadaan, and E. Taciroglu.
Status – Completed
Task 8 Final Report
- Input Ground Motions for Tall Buildings With Subterranean Levels – Jonathan P. Stewart, Salih Tileylioglu (PDF file – 684 KB)
Task 9 - Presentations at Conferences, Workshops, Seminars
Task 9 – Presentations at Conferences, Workshops, Seminars
Task description – Implement a vigorous outreach program to engage a broad group of stakeholders and end users in the program, so it is well known among key stakeholders and end users, and so it is aware of and responsive to needs of those stakeholders and end users.
Lead investigator – Jack Moehle
Proposed team members – T-PAC
Status – Active
Task 10 - Performance-Based Seismic Design Guidelines for Tall Buildings
Task 10 – Performance-Based Seismic Design Guidelines for Tall Buildings
Task description – Performance-Based Seismic Design Guidelines for Tall Buildings
Lead investigator – Ron Hamburger
Team members – Yousef Bozorgnia (PEER, UC Berkeley); C.B. Crouse (URS Consultants); Ronald Hamburger, Chair (Simpson Gumpertz & Heger); Ronald Klemencic (Magnusson Klemencic Associates); Helmut Krawinkler (Stanford University); James Malley (Degenkolb Engineers); Jack Moehle, Co-Chair (PEER, UC Berkley); Farzad Naeim (John A. Martin & Associates); and Jonathan Stewart (UC Los Angeles)
Funding Agencies – The Charles Pankow Foundation
Status – Active
Final Guidelines Document
- Guidelines for Performance-Based Seismic Design of Tall Buildings – PEER 2010/05 (PDF file – 5.0 MB)
Supporting Documents
- November 2010 Draft: PEER Seismic Design Guidelines for Tall Buildings (pdf – 6.3 MB)
- Files from the PEER & SEAW Workshop: Performance-Based Seismic Design Guidelines for New Tall Buildings – November 30, 2010, Seattle, Washington:
- Overview: PEER Tall Building Seismic Design Guidelines – Crouse, Hamburger, Hooper, Moehle (PDF file – 2.5 MB)
- Case Studies Performance Assessment – Moehle (PDF file – 9.1 MB)
- Preliminary Design Recommendations & Performance Studies – Hooper (PDF file – 4.2 MB)
- Analysis, Modeling and Acceptance Criteria – Hamburger (PDF file – 10 MB)
- Performance-Based Seismic Design Guidelines for Tall Buildings Ch. 5: Seismic Input (Ground Motion) – Crouse, Stewart, Bozorgnia (PDF file – 41.2 MB)
- October 2010 Draft: PEER Seismic Design Guidelines for Tall Buildings (PDF file – 13.9 MB)
- July 2010 draft of the TBI Guidelines – 27 July 2010 (PDF file – 1.7 MB)
- First draft of seismic design guidelines – March 21, 2009 (PDF file – 11.2 MB)
- The PEER Tall Buildings Initiative Guidelines Overview Presentation from LATBSDC 2009 (pdf file – 9.78 MB)
- Applicability of UBC-97 Eqn. 30-7 to Drift Calculations
- Recommended Administrative Bulletin on the Seismic Design & Review of Tall Buildings Using Non-Prescriptive Procedures, SEAONC & AB-083 Tall Buildings Task Group (April 2007) (PDF file – 1.3 MB)
- An Alternative Procedure for Seismic Analysis and Design of Tall Buildings Located in the Los Angeles Region (PDF file – 1.14 MB)
- Council on Tall Buildings and Urban Habitat Website
- Recommendations for the Seismic Design of High-Rise Buildings, Council on Tall Buildings and Urban Habitat
Task 11 - Instrumentation (Under Development)
Task 12 - Quantification of seismic performance levels of tall buildings
Task 12 – Quantification of seismic performance levels of tall buildings
Task description – The task seeks to identify the benefits and costs of designing tall buildings to alternative performance levels, and aims to provide data that will help code writers and local jurisdictions address the question of whether alternative performance objectives are appropriate and cost-beneficial for tall buildings. In this project, practitioners with experience in tall building seismic design have developed conceptual designs of three different tall buildings, each designed by three different design procedures, for a total of nine designs. PEER researchers at UC Berkeley, UC Irvine, and UCLA are analyzing these design variations to quantify construction costs, seismic performance, and post-earthquake capital losses.
Lead investigator – Jack Moehle, PEER
Team members –Researchers Jack Moehle (UCB), Yousef Bozorgnia (UCB), John Wallace (UCLA), Farzin Zareian (UCI), and Tony Yang (UBC); practicing engineers at Magnusson Klemencic Associates (Seattle), Simpson-Gumpertz & Heger (San Francisco), and Englekirk Associates (Los Angeles); and cost or loss estimator RMS.
Funding Agencies – California Seismic Safety Commission & California Emergency Management Agency
Status – Active
Task 12 Final Reports
(PDF file – 115 KB)
Supporting Documents
- Task 12 Sub-tasks – (PDF file – 68 KB)