A computing software and hardware, high-resolution simulation of

A report on design guidelines of the blast resistant highway
bridges was published by Eric Williamson et al. (2010) through TRB’s National
Cooperative Highway Research Program (NCHRP) in which general and simplified
guidelines and design procedure were explored for blast-resistant reinforced
concrete bridge columns; Also the results of
experimental blast tests and analytical research were examined to compare the
different design techniques. In a research, bridge vulnerability assessment and
mitigation against Explosions was presented by Kiger et al. (2010) and based on
numerical and analytical results it was indicated a need to establish design
criteria for post-tensioned box girder bridges under explosive loads which
would predict the relation between the damage type and the charge size.

The progressive collapse of highway bridges has been investigated
by Ghali and Tadros (1997), which could be resulted owing to the loss of a
local bridge component while blast event, for a 12,910-m-long bridge on
Northumberland Strait in Canada. A modified design has been proposed where a
drop-in span would just separate from the rest of the bridge during local
damage to the bridge deck, leaving the remaining bridge system vibrating freely
owing to dynamic loads created during the local damage. Because of the
availability of the high-performance computing software and hardware, high-resolution
simulation of explosion influences on structural members has become feasible
during the last decade. Results of Numerical simulation
of four bridge components under blast loads of various scaled distances have been
presented by Hao and Tang (2010) and the progressive collapse analyses of the
bridge structure have been performed after that the damage has occurred in either
one of the four main components of the bridge. It has been noticed that
the failure of vertical load-carrying components causes bridge collapse
catastrophically, whereas an above-deck explosion leads to the bridge’s severe
instability. The progressive collapse of post-tensioned box girder bridges
under blast loads have been investigated by Ibarhim et al. (2012).

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The aim of this
study is concentrated on the effect of blast loads on a case study suspension
bridge components and a detailed investigation of the progressive collapse and
the performance of bridge components during blast loads.