Experimental Study Of Reinforced Concrete Inclined Piles Subjected To Horizontal Impact Loading

Under the promotion of "The Belt and Road Initiative" policy in our country,large-scale wharf engineering construction emerges as the times require,but at the same time,it also puts forward higher requirements for its safety.As one of the main structural forms of wharf,concrete high pile foundation not only resists static load,but also resists wind,earthquake and impact.Due to improper speed control or human operation error,the accident of ship hitting high pile wharf often occurs when the ship docks,and the consequences are very serious once it occurs.Therefore,this paper takes the reinforced concrete inclined pile which is vulnerable to the impact of landing ships in the high pile wharf as the research object,and carries out the horizontal impact tests of the reinforced concrete inclined piles,which provides a reference for ensuring the safety and reliability of the wharf structure.The main research work is as follows:(1)The static load tests of 3 reinforced concrete inclined pile specimens,the horizontal impact tests of 9 reinforced concrete inclined pile specimens and the residual bearing capacity tests of 6 reinforced concrete inclined pile specimens after impact were carried out.The stress mode and failure mechanism of the specimens under static load,the energy dissipation mechanism of the specimens under horizontal impact and the dynamic responses such as failure mode,impact force,displacement,strain and so on were studied.Rules of the influence of different single pile inclination angle and impact velocity on the dynamic response were investigated;the influence of impact damage on the residual bearing capacity of the specimens was studied.(2)The finite element model of reinforced concrete inclined piles subjected to horizontal impact load was established by using the nonlinear finite element calculation software ANSYS/LS-DYNA,and the numerical analysis results were compared with the experimental results.It was verified that the finite element calculation model can well simulate the dynamic response of reinforced concrete inclined piles under horizontal impact load,which showed that the calculation model was reliable.(3)Based on the established finite element model,the parametric analysis of 52 specimen models with different mass and velocity combinations of the same kinetic energy or momentum were carried out.The dynamic response of the specimen under the combined influence of mass and velocity under horizontal impact load was studied,and the rationality of predicting the dynamic response of specimens by kinetic energy or momentum was evaluated.