Based On AUTODYN Researching The Blast Response And Damage Form Of Long-span Continuous Rigid Frame Bridge

Blast load is a kind of accidental load，It’s characteristic of short time, strongdestructive power. Bridge as a transport hub will be the target of war, terrorist attack. Accidental explosion dangerous goods in daily life also can cause fatal damage ofbridge structure. But at present there is no specific theory of anti-explosion designspecification in bridge. This article mainly is the significance of research of long-spancontinuous rigid frame bridge under explosion load of structure dynamic responseand damage effect through the finite element numerical simulation. Researchexplosion failure pattern of the bridge and to provide theoretical basis for the bridgeanti-explosion design.This article is used to numerically simulate the explosion process through thefinite element software AUTODYN， Simulation explosion shock wave propagationin the air. Explosives, air and reinforced concrete structure numerical model is set upin AUTODYN, numerical simulation of explosion and fluid-structure couplingcalculation. By establishing the finite element model of reinforced concrete plate blastanalysis and comparing the existing scholar’s test, I study the feasibility of usingnumerical simulation analysis of explosion process. Our team study the explosionresponse of the bridge under explosion load and the failure pattern through theestablishment of the actual bridge model. Through multiple explosion conditionSettings, respectively study the explosion scale distance Z, the explosion quality andthe location effect of explosion of the bridge. Comparative analysis over the bridgebelow the explosion and explosion of explosive when different explosion response ofthe bridge, analysis of bridge box girder explosion in vivo and in vitro of differentexplosion explosion effect By comparing the analysis we can draw some conclusionsabout the response of bridge structure and the damage effect of conclusion.The study found that using the finite element software AUTODYN can be agood simulation of the occurrence of explosion load, transmission process and action. AUTODYN software can be a good simulation of explosive, air, reinforced concretestructure of the constitutive relation and mutual coupling. Continuous rigid frame bridge under explosion resistance than above explosion. The continuous rigid framebridge girder body exploded due to blast shock wave in a closed space superpositionof repeated reflection caused by the destruction of the explosion shock wave powerdoubling, the explosion of the bridge structure dynamic response and damage effectalso is bigger than explosion condition in vitro. The research conclusion to the studyof actual bridge in the cases of explosion effect is important, blasting demolition ofthe bridge in practical engineering is also has important guiding significance.