Bridges, I will give a public seminar in Room 502 Davis Hall of UC
Berkeley Campus on Wednesday October 3, 2007. More information and full
announcement is at:
The abstract is below:
=================
"Blast Protection of Bridges" By: Abolhassan Astaneh-Asl, Ph.D., P.E.,
Professor, (www.ce.berkeley.edu/~astaneh)
University of California, Berkeley
*Abstract:* The main objective of research and technology development
project conducted by Doctoral Candidate Jin Son and Professor Abolhassan
Astaneh-Asl was to study effects of blasts due to car bombs placed on
the deck of major steel bridges and to develop technologies that if
implemented can prevent progressive and catastrophic collapse of these
bridges and massive loss of lives. In this study, the performance of
modern steel orthotropic decks as well as traditional steel plate girder
–concrete slab decks of cable-supported bridges subjected to blast load
is analyzed. The study is done by simulating blast as well as structural
properties of typical bridge decks using MSC.Dytran finite element
analysis software developed by MSC.Software Corporation. The car bomb
detonation on the deck is assumed to be the most likely scenario to
happen on a bridge. Air surrounding the structure and explosive device
is also modeled to be able to transfer the blast effects to the
structure. The main parameters of study were the size of explosives,
properties of steel and concrete and the amount of axial load in the
bridge deck. The effects of high strain rate on the material are also
included. By conducting the dynamic analysis the failure modes are
identified and strengthening measures to enhance blast-resistance
behavior are developed and proposed. The measures if implemented, can
help prevent progressive collapse of long span cable-supported bridges,
such as suspension bridges, cable-stayed bridges and self anchored
bridges, in the event of a terrorist blast attack. Special attention has
been paid to present information in this lecture that can only be used
to enhance the progressive collapse resistance of bridges and not to
present information that can be used for malicious purposes.
The project is funded in part by the National Science Foundation and
software is provided by MSC Software Corporation 9www.mscsoftware.com) .
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