Research On Damage Characteristics Of Concrete Bridge Subjected To Blast Loading

At present,explosion accidents happened on bridges have been increasing continuously, structural damages and casualties caused by explosion seriously decrease the safety of bridges. Therefore,ensuring the safety of bridge structure subjected to blast loading is becoming more important.However,little research has been done in this field,which can not be adapted to the need of bridge construction.In order to establish more rational design theories and methods and make the bridge structure more effective against blast load,it is very essential to carry out basic research and have a deeper understanding of explosion response of concrete bridge structure.Based on the basic theory of explosion,this paper studies the damage mechanism of concrete bridge under blast loading.After grasping related analysis methods,a reasonable finite element model is established.In the model,considering of concrete strain-rate effect,a triangle time-pressure is loaded on the related deck.Then,by using transient analysis module of software ANSYS the dynamic response and damage effects of the whole structure are analyzed.At last,by changing the load position,load size,load rate and concrete strength grade,the paper studies damage effects and damage factors of the structure,and gets the influence degree and rules of the damage effects under different parameters.The results of this paper can be used for the anti- explosion design and comprehensive protection of bridge structure.