The following PowerPoint was presented to the Director and...

October 9, 2013

An Important note from the Principal Investigator Abolhassan ASTANEH-ASL on the document that follows:

The following PowerPoint was presented to the Director and staff of the Lawrence Hall of Science in Berkeley in 2002.

Abolhassan ASTANEH-ASL, Ph.D., P.E.

Professor and Principal Investigator for the NSF Funded UC Berkeley WTC Project (Duration: 10-2001 to 9-2002)

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By

Abolhassan Astaneh-Asl, Ph.D., P.E., Professor

Department of Civil and Environmental Engineering

University of California, Berkeley

Developing Technologies to Protect Structures

from Extreme Events

A presentation to staff of the Lawrence Hall of Science

Hosted by the Public Programs Division

Organized by Barbara Ando

June 18, 2002

This document is part of the “World Trade Center Post-Disaster Reconnaissance and Perishable

Structural Engineering Data Collection”, a research project funded by the U.S. National Science

Foundation at the Univ. of California Berkeley with Prof. Abolhassan ASTANEH-ASL as Principal

Investigator (http://www.ce.berkeley.edu/~astaneh) as the Principal Investigator. Duration of the project

was from 10/2001 to 9/2002. Further Information and project archives are at

http://lib.berkeley.edu/ENGI/WTC. © 2001 Abolhassan ASTANEH-ASL.

"This work is licensed under a Creative Commons Attribution-NonCommercial -No Derivatives License."

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http://www.ce.berkeley.edu/~astaneh

http://lib.berkeley.edu/ENGI/WTC

http://creativecommons.org/licenses/by-nc/3.0/





American Institute of Steel Construction

California Department of Transportation

General Services Administration

Golden Gate Bridge and Transportation District

National Science Foundation

University of California

Main Sponsors and Supporters of

A. Astaneh’s Research at UC-Berkeley

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Extreme Event for Structures: An “event” that has low probability of

occurrence but high, and usually

catastrophic, consequences.

Examples of Extreme Events:

Earthquakes (natural)

Fires (accidental or intentional)

Tornados (natural)

Hurricanes (natural)

Blasts (accidental or man made)

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Extreme Event for Structures: An “event” that has low probability of

occurrence but high, and usually

catastrophic, consequences.

Examples of Extreme Events:

Earthquakes (natural)

Fires (accidental or intentional)

Tornados (natural)

Hurricanes (natural)

Blasts (accidental or man made)

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The main objective of my research and

development projects has been to develop

technologies that can be used to prevent

collapse of the structures and massive loss

of lives in a seismic or blast “Extreme

Event”.

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Protection of Structures from Seismic Hazard

To study buildings, bridges and other structures to

understand their seismic behavior and to develop

technologies to prevent their collapse and to save

lives

From a Refinery… …to a Campus building

..to major bridges


All photos Copyright © 2001 Abolhassan ASTANEH-ASL

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Study Structural Members and Their Connections

• By actual tests or by simulation using computers

“Study bones and their joints!”

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Some of the Member and Connections Studied



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Some of the Member and Connections Studied

Golden Gate

Akashi Kaikyo

Bridge



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We are in search of connections with ductility

“will bend but not break!”



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Of course behavior of the structure as a “system”

is the most important item to be understood.

Shaking Table Tests

System Studies:

Computer Simulations Post Event

Investigations

Kobe ‘95



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A. Astaneh’s Major Research and Design Projects at UCB:

Studies of Earthquake Damage to Structures

Mexico ‘85

Whittier ‘87 Roodbar, ‘90

Loma Prieta ‘89

Kobe ‘95

Northridge ‘94



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Recent Trends in Steel Design By A. Astaneh-Asl, University of California, Berkeley

Here is an Example: LA Moment Frames

• The fractures caused major concern

in U.S. and in Japan. Studies were

undertaken by A. Astaneh et al. to

investigate safety of damaged

structures.

Tests by M. Engelhardt, University of Texas, Austin

Damaged

Welded

Moment

Frame


All photos Copyright © 2001 Abolhassan ASTANEH-ASL 14 of 30


Analysis of Damaged and Undamaged Frames in Los Angeles

by: A. Astaneh et al.

14-Story

Damaged Frames

Undamaged Frames



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Seismic Design of

Bolted Top and Bottom Flange Plate

Moment Connections

A. Astaneh-Asl, Ph.D., P.E., Professor

Department of Civil and Environmental Engineering

University of California, Berkeley

August 2000 ( First Edition, July 1995 in “Steel Tips Report: “Seismic Design of Bolted steel Moment-Resisting Frames)



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Semi-rigid Frames

• Semi-rigid and rigid frames were tested on

shaking table.

• Behavior of Semi-rigid Frames was

much better.

• Semi-rigid systems act as passive

energy dissipaters

Semi-rigid

Moment Frames

Tests by A. Astaneh et al.



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After Northridge Earthquake, many structures

are designed using bolted moment connections


Copyright © 2001 Abolhassan ASTANEH-ASL

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Seismic Design and Retrofit of Major Long Span Bridges

Major Projects

in US



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Seismic Design and Retrofit of Major Long Span Bridges

Astaneh-Black Proposal

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Seismic Design and Retrofit of

Major Long Span Bridges

Major Projects

Overseas

Akashi-Kaikyo

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Developing High Strength Composite

(Steel+Concrete) Columns Sponsors:

National Science Foundation,

UC-Berkeley A. Astaneh-Asl, C. Chen, M. Aschheim

The benefits of high strength steel and concrete are combined to

produce safer and more economical building columns

Steel Concrete Composite

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Developing Technologies to

Prevent Progressive Collapse of Buildings

The car bomb exploded too close to the building, knocking out a column

and transfer girders. Then due to progressive collapse, ½ of the building

collapsed under gravity load.

Terrorist attack and collapse of Murrah Federal Building

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Developing Technologies

to Prevent

Progressive Collapse of Buildings

Sponsors:

National Science Foundation,

General Services Administration

UC-Berkeley & LLNL A. Astaneh-Asl, Q. Zhao, R. Hua, W. Li,

D. McCallen, C. Noble,

Eric Madsen, Brant Jones

Vertical

Displacement of

20.8 inches

Column is Gone, Floor

is Still Standing


Copyright © 2001 Abolhassan ASTANEH-ASL

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Developing Composite (Steel+Concrete)

Shear Walls

for Seismic, Fire and Blast Resistance

Components of Composite

Shear Wall

Steel

Plate

Pre-cast

Concrete

Wall

Steel

Columns

and

Beams

Bolts

Sponsor:


UC-Berkeley

A. Astaneh-Asl, Qiuhong Zhao,

Ricky Hua, Wendi Li, J. Liu

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The World Trade Center Collection of Perishable Data and

Funded by National Science

Foundation on 9/15/2001 UC-Berkeley

A. Astaneh-Asl

An interior column seems to have been hit by an

engine

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The World Trade Center Study of Collapse

Sponsor:


UC-Berkeley and

MSC Software

A. Astaneh-Asl , J.Shen. C. Heydari

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The World Trade Center Study of Collapse

Sponsor:


UC-Berkeley and

MSC Software A. Astaneh-Asl , J.Shen. C. Heydari

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Congressional Hearing

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Concluding Remarks on

1. NSF Sponsored Research

2. Education (K-12 and Graduate)

3. Learning from Disasters (EERI)

4. Infra-Structure of Laboratories (NEES)

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