Study On Impact Analysis And Anti-collision Design Of Bridge Pier With Foundation Erosion

As the two important problems that cause the bridge pier to destabilize and cause the damage of the bridge,the foundation scour and ship collision of the piers have been the focus of scholars all over the world.However,most of the countries have studied the bridge foundation scour and the bridge in two directions,without considering the correlation between them.Based on this background,in combination with the reality,the bridge is likely to face both erosion and ship collision.The main research contents and conclusions of this paper are as follows:1.Due to the scouring effect of the main pier foundation is part of the m value of thesis mainly adopted Peng Song model method to simulate the interaction of piles and soil,and the common bridge subjected to scour through theoretical calculation,the influence of soil spring of Midas fem software is used to realize the application of m value method.Through the finite element model calculation and theoretical analysis of the results,can be found both draw internal force of pile foundation are within 3%,proved that the m value method applied in the finite element model is feasible,and with the deepening of scour depth,strength will not be enough to support a bridge pile foundation,the pier top displacement also increases with the deepening of scour depth,which affects the deck crane.2.After the m value validation of the method feasibility,selection of yunyang keeping deer in finite element modeling of the bridge,on the basis of the ship impact force to take the current specification,pier foundation scour impact analysis of the impact resistance of the bridge pier.Under the different scour depth,the analysis of ship suitable to hit a deer bridge,cross the bridge,can be found in the existing specification will ship impact force equivalent to the static,the result is an old-fashioned,caused the ship after small pier top displacement,it is unfavorable for the impact of the bridge design.With the increase of scour depth,the shafts of the bending moment decreases with the increase of scour depth,make piers improved impact resistance,but the bending moment of pile foundation with downward extension and scour depth increase,this will make the pile foundation is under load is much bigger than before,seriously affected the safety of the bridge pier.3.After more than static model analysis,on this basis,the good to a deer bridge 1 pier by using Abaqus finite element analysis software modeling analysis,and simulation of FRP flexible piers anticollision structure,from the Angle of dynamics analysis of bridge foundation scour,ship collision,and FRP flexible anticollision structure brings a series of response of the bridge.According to tensile stress distribution trend of piers under different scour depth and the pier top displacement detection,pier tensile stress concentrated area as the scour depth deepening,began to spread to the lower part of bridge pier,this shows that,since the washout of bridge pier flexible get promoted,impact resistance,static model to verify the conclusion,the existence of the flexible and FRP tank greatly made up for by the tensile stress of pile foundation scour lead to increasing problems,ensure the overall stability piers.4.Summary of FRP bridge flexible anti-collision construction design,the manufacturing process of the FRP flexible anticollision structure and installation technology requirements was reviewed,and the quality acceptance and FRP FRP tank structure is given material quality acceptance standard.