The Analysis Of Concrete Bridge Structures’ Dynamic Response Under Exploding Impact

In recent years, terrorist attacks and accidental explosions in production and dailylife have seriously affected the normal usage of bridges and people’s safety of life andproperty. Because of the specificities and complexities of structures antiknock research,bridge design specifications don’t yet include exploding impact’s influence on bridgestructures and corresponding protective measures. The present researches on explodingimpact’s influence on bridge structures most just focuse on the basic theory andnumerical simulation, lack of necessary experimental study. Therefore, promoteexplosion experiment combined with numerical simulation to further study of concretebridge structures dynamic response under exploding impact is becoming a new subjectin the field of bridge engineering.Based on the basic theory of explosion, this paper designs the concrete simple Tbeam models, and completes the experiment research under different exploding heightand quantity of explosive. The experiment adopts concrete ultrasonic detectiontechnology to detect the degree of damage inside the concrete, and use UTC dynamictesting system to collects acceleration and strain value on flange plate and girder rib. Onthis basis, this paper analyses concrete simple T beam bridges’dynamic response underdifferent exploding height and quantity of explosive.This paper choosesANSYS/LS-DYNA analyses the dynamic response of T beam models,and compareswith the results of experiments.The results show that the flange plates are easier todamage than other parts under exploding impact.And the bridge structures’ dynamicresponse are more sensitive to exploding height.