Analysis Of Dynamic Response To Ship Impact In Inland River High-Pile Wharf Considering Pile-soil Interaction

In this paper,based on the analysis of the ship-wharf structure dynamic response of the ship,considering the influence of the soil around the pile,the soil model is established.For the rubber fenders of the wharf structure that directly contact the ship,the actual dimensions are used to construct the model.The case used in this paper is an inland river overhead vertical wharf with inclined rock-socketed piles.The ship impact force,displacement of wharf structure and stress of wharf structure were obtained with the finite element software ANSYS/LS-DYNA and the considering influence factors are beam rigidity,ship stiffness,ship tonnage,berthing speed,berthing angle and berthing height,and compare these with the dynamic response of the all straight pile wharf,the main conclusions are as follows:(1)After the wharf structure is impacted by a ship,its impact force history curve is approximately a parabola.The duration of collision of the ship is very short.In 1s,the impact force rapidly reaches the extreme value,then gradually decreases and finally decreases to zero.However,when the ship’s mass is large,the berthing speed is large and the berthing angle is large,the ship may have secondary impact with the wharf.(2)The ship impact force increases with beam rigidity,the stiffness of the ship,the tonnage of the ship,the berthing speed of the ship and the angle of berthing of the ship.The berthing water level of the ship has a great influence on the ship impact force.When the ship berths at the bottom of the mooring line,the ship impact force is maximum,and the maximum principal stress of the wharf structure is the largest,but the displacement of the wharf structure is small.When the ship berth at the third layer of the mooring line,the displacement of the wharf structure is largest,but the impact force and the maximum principal stress of the wharf structure are small.(3)Compared with the calculation results of the ship-wharf structure model using pile-end anchoring,it is found that considering the pile-soil effect will increase the displacement,simplifying the model will increase the impact force.When the tonnage of ships is changed,the time history curves of ship impact force under the two modes are the same and the collision time is approximately equal.However,the maximum impact force of the ship under the piled-end anchorage is greater,and when the tonnage of the ship is larger under the influence of pile and soil,the gap is small.Compared with the theoretical value,it is found that the theoretical value obtained from the port engineering load specification is too small,and attention should be paid to the calculation and selection.(4)Compared with all straight pile wharf,the displacement and the maximum principal stress of the rock-socketed inclined wharf structure are relatively small after being impacted by the ship,which indicates that it has a better bearing capacity and structural deformation control ability on the ship impact force.