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Tall Buildings Initiative (TBI) & TBI Design Guidelines

Yousef Bozorgnia, Ph.D., P.E.

Jack Moehle, Ph.D., P.E.

Pacific Earthquake Engineering Research Center (PEER), University of California, Berkeley

April 19, 2011 SEAONC

Outline

  An overview of PEER Tall Buildings Initiative (TBI)

  Overview of the TBI Guidelines for Performance-Based Seismic Design of Tall Buildings

  Followed by a series of presentations on specific topics of the TBI Guidelines

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Tall buildings circa 2005

  Surge in high-rise building construction   taller   new materials and systems

  Absent or inconsistent guidance

  Limited research

Tall Buildings Initiative (TBI)

  An initiative to advance performance-based design of new tall buildings in high seismicity regions

  Coordinated by Pacific Earthquake Engineering Research Center (PEER)

  Through effective interactions between academia and private practice

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TBI Partners   Applied Technology Council   California Geological Survey   California Emergency Management Agency   California Seismic Safety Commission   FEMA   Los Angeles Dept. of Buildings & Safety   Los Angeles Tall Buildings Council   National Science Foundation   Pankow Foundation   PEER   San Francisco Building Department   SCEC   SEAOC   USGS

Tall Buildings Initiative (TBI)   Purpose

  Develop design criteria and guidance for the seismic design and review of tall buildings in high seismicity regions

  Tasks   Develop consensus on performance objectives

  Ground motion selection and scaling

  Soil-foundation-structure interaction modeling

  Benchmark studies of building dynamic response

  Model building designs

  Case studies: comparison of seismic performances

  Development of performance-based design Guidelines

  Modeling and acceptance criteria (ATC-72)

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Tall Buildings Initiative (TBI)

  Case studies: comparison of seismic performances

  Development of performance-based design Guidelines

  Modeling and acceptance criteria (ATC-72) Today

Thurs

42-story reinforced

concrete core wall

42-story reinforced

concrete dual system

40-story steel

special moment-

frame

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Each building was designed according to three design criteria

  Performance evaluation and cost-benefit analyses of 9 tall building designs were carried out

  Details of case studies will be presented on April 21, 2011

Guidelines for Performance-Based Seismic

Design of New Tall Buildings

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Purpose of New Design Guidelines

  Improved design criteria based on:

  Recent design experience

  State-of-the-art research on performance-based earthquake engineering (PBEE)

TBI Guidelines   Key Sponsor

  Charles Pankow Foundation

  Development team   R. Hamburger, J. Moehle

(Co-chairs)

  Y. Bozorgnia

  C.B. Crouse

  R. Klemencic

  H. Krawinkler

  J. Malley

  F. Naeim

  J. Stewart

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TBI Guidelines Chapters

1.  Introduction

2.  Performance objectives

3.  Design process

4.  Design criteria documentation

5.  Seismic input

6.  Preliminary design

7.  Service level evaluation

8.  MCE level evaluation

9.  Presentation of results

10.  Project review

Chapter 1. Introduction

  Scope   Seismic structural design of tall buildings

  Fundamental periods >> 1 second

  Significant mass participation and response in higher modes

  Slender aspect ratio

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TBI Guidelines Chapters

1.  Introduction

2.  Performance objectives

3.  Design process

4.  Design criteria documentation

5.  Seismic input

6.  Preliminary design

7.  Service level evaluation

8.  MCE level evaluation

9.  Presentation of results

10.  Project review

Ron Klemencic

TBI Guidelines Chapters

1.  Introduction

2.  Performance objectives

3.  Design process

4.  Design criteria documentation

5.  Seismic input

6.  Preliminary design

7.  Service level evaluation

8.  MCE level evaluation

9.  Presentation of results

10.  Project review

Yousef Bozorgnia

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TBI Guidelines Chapters

1.  Introduction

2.  Performance objectives

3.  Design process

4.  Design criteria documentation

5.  Seismic input

6.  Preliminary design

7.  Service level evaluation

8.  MCE level evaluation

9.  Presentation of results

10.  Project review

Ron Hamburger

TBI Guidelines Chapters

1.  Introduction

2.  Performance objectives

3.  Design process

4.  Design criteria documentation

5.  Seismic input

6.  Preliminary design

7.  Service level evaluation

8.  MCE level evaluation

9.  Presentation of results

10.  Project review

Modeling and acceptance criteria

(ATC-72) Jon Heintz

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1. Introduction

  Purpose   Recommended design criteria and

procedures for individual tall buildings   Meet performance goals for Occupancy

Category II Buildings

  Scope   Seismic design of tall buildings   Fundamental periods >> 1s   Significant mass participation and response

in higher modes   Slender aspect ratio

Tall Buildings Initiative