Dynamic Response Numerical Simulation Of High-Pile Wharf Considering Pile-Soil Interaction

Compared with other forms of wharf structure, the high-pile wharf as a form of structure in port engineering has many advantages such as adaptable soft foundation, etc. Due to the fact that China is a seismic country and strong destructiveness of earthquake, the destruction of structures is often difficult to be repaired. The high-pile wharf is located in soil layer, the damage of its structure is hard to be found. Working condition of Pile wharf, as Marine structure, is extremely bad. They are often subjected to wind, wave and flow, ships, etc. Besides, the effect from seismic loads and the wave action often exist at the same time. However, they both have the distinct characteristics and interaction is very complicated. There are huge differences between the response of dynamic load and static load exerted on the same structures. In the design of pile wharf, in terms of the response of the dynamic loading and checking, the pile bottom fixed model is popular, without considering the constraints of the upper structure of soil between piles. With considering the effect between piles and soil on The high-pile wharf, it is necessary to study the action of dynamic response in the earthquake and wave at the same time.This report will take high-pile wharf as an example, through applying ANSYS which is a professional engineering software to establish finite element model of pile wharf in order to analyze the variation of wharf structures under earthquake and wave loads. In addition, the structure of the dynamic characteristics and displacement of pile internal force will be analyzed. In practical engineering projects, wharf structure will be applied to different port design. In order to obtain beneficial conclusions which are adapted to more terminals, the changes of displacement and shear force in different port structures will be compared with each other.After the completion of this report, some useful conclusions can be got as following: (1)according to dynamic characteristics of the wharf structure, the maximal displacement of pile body is gradually increasing from bottom to top. The displacement, shear force, bending moment and axial force are characterized by two side piles at the same level of numerical value is greater than the middle pile; (2)Pile displacement, shear force and moment of maximum value appeared at the top of the pile, maximum of axial force, reverse shear force and reverse bending of pile body locate on equivalent mud surface, in different soil layers at the near junction of the shear and moment of the pile body can appear partial maximum. Inclined pile is not the main components to bear bending moment but bear shear force. And the front straight pile bears most of the bending moment. (3)Due to the changes of the free end of the pile length, thickness of the upper panel, the upper soil modulus and pile tilt angles, the horizontal stiffness of wharf structure are various, as well as the biggest displacement of whole pile body, the shear stress values and phase get changing and present a different change rule. (4)With the increase of buried depth of pile foundation, influences coming from changed factors exerted on the pile displacement and shear stress get gradually weak, below the equivalent mud surface of pile foundation, the internal forces are rapidly decreased so that it will not reach the bearing capacity of pile foundation.