Numerical Study On The Dynamic Response Of Reinforced Concrete Inclined Pile Structure Under Lateral Impact Loading

Reinforced concrete inclined pile is the main structural component of high pile wharf structure.During the service lives,except the dead load,live load and other kinds of load in the normal environment,wharf structures may be subjected to impact loads such as ship crowding force,mooring ship impact force and so on.Among them,the large-energy impact can cause serious damage to the structural components in a very short time,and even lead to the overall collapse of wharf structures,resulting in serious consequences.Therefore,it is of great significance and engineering value to study the dynamic response of reinforced concrete inclined pile structure under impact load.The main work of this paper is as follows:(1)Taking the reinforced concrete inclined pile structure as the analysis object,the effective horizontal impact numerical model is established by using finite element software ABAQUS.It has reference significance for the subsequent investigation of the dynamic response of reinforced concrete inclined pile structure.(2)Based on the established finite element model,the mechanism of reinforced concrete inclined pile structure under horizontal impact is numerically analysed.Compared with the horizontal impact test results of nine specimens with different inclination and impact velocity,the numerical model is validated from the aspects of failure mode and dynamic behavior.Then,the dynamic response characteristics of reinforced concrete inclined pile under horizontal impact are systematically studied,including energy state,impact force time history,displacement time history,impact energy consumption,stress development and internal force.(3)The expanded parametric analysis of reinforced concrete inclined pile structure under horizontal impact is carried out.The considered parameters include impact mass,reinforcement ratio of pile cross section,steel strength,concrete strength and inclination angle of inclined pile structure,etc.The practical formulas for predicting the maximum displacement at the impact point of the inclined pile structure under horizontal impact are obtained,by regression of three groups of typical inclined pile structures(structural inclination angles of 72°,81°and 90°).It provides a reference for the performance-based impact-resistance design and practical engineering design.Furthermore,the displacement of reinforced concrete inclined pile structure with lateral constrain under horizontal impact is studied.