A loss of a local bridge component while blast

A report on design guidelines of the blast resistant highwaybridges was published by Eric Williamson et al. (2010) through TRB’s NationalCooperative Highway Research Program (NCHRP) in which general and simplifiedguidelines and design procedure were explored for blast-resistant reinforcedconcrete bridge columns; Also the results ofexperimental blast tests and analytical research were examined to compare thedifferent design techniques. In a research, bridge vulnerability assessment andmitigation against Explosions was presented by Kiger et al.

(2010) and based onnumerical and analytical results it was indicated a need to establish designcriteria for post-tensioned box girder bridges under explosive loads whichwould predict the relation between the damage type and the charge size.The progressive collapse of highway bridges has been investigatedby Ghali and Tadros (1997), which could be resulted owing to the loss of alocal bridge component while blast event, for a 12,910-m-long bridge onNorthumberland Strait in Canada. A modified design has been proposed where adrop-in span would just separate from the rest of the bridge during localdamage to the bridge deck, leaving the remaining bridge system vibrating freelyowing to dynamic loads created during the local damage.

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Because of theavailability of the high-performance computing software and hardware, high-resolutionsimulation of explosion influences on structural members has become feasibleduring the last decade. Results of Numerical simulationof four bridge components under blast loads of various scaled distances have beenpresented by Hao and Tang (2010) and the progressive collapse analyses of thebridge structure have been performed after that the damage has occurred in eitherone of the four main components of the bridge. It has been noticed thatthe failure of vertical load-carrying components causes bridge collapsecatastrophically, whereas an above-deck explosion leads to the bridge’s severeinstability. The progressive collapse of post-tensioned box girder bridgesunder blast loads have been investigated by Ibarhim et al. (2012). The aim of thisstudy is concentrated on the effect of blast loads on a case study suspensionbridge components and a detailed investigation of the progressive collapse andthe performance of bridge components during blast loads.