Finite Element Analysis And Design Method Study Of The Integral Casting And Fabricated Batter Pile Joint On Pile-Wharf Structures

A wharf of port facilities occupies an important position to a national economy and the social development. Some huge economical loss and bad social effect will be made because of the interruption of the port facilities, in addition, the repairing and reconstruction of the wharfs will cost extraordinarily much. Earthquake reconnaissance efforts suggests that the damage of pile-wharf structures results from liquefaction of surrounding soil, inadequate structural performance and the anti-seismic performance. However, there are few researches about the research so far. As a result, carrying out anti-seismic research of the wharf is essential to improve anti-seismic capacity and reduce the earthquake disaster for the wharf of port facilities.According to the coexisting problems of the high-pile wharf in China and America, this report put forward an integral casting and fabricated steel batter piles joint. Through theoretical analysis, this paper is intended to explore anti-seismic performance and failure mechanism of the batter pile connection, to propose the anti-seismic design and anti-seismic structural measures, to seek new approaches for the improvement of the anti-seismic performance of the high-pile wharf and to provide reference for the experimental study of such joint.In this paper, by finite element software ANSYS, study on the batter joint is carried out by elastic and non-linear finite element method analysis, and further study is focused on mechanical characteristics and anti-seismic performance of the batter pile joint. The research contents of this paper are as follows: (1) Whole analysis is carried on the high-pile wharf. With different seismic wave peak acceleration and anti-seismic fortification intensity, the maximum lateral displacement is calculated; (2) According to the maximum lateral displacement of the whole analysis, the relevant norms and the analysis of the internal forces of the batter piles, design a batter joint sample which can meets the requirements; (3) Through the elastic finite element analysis, analyze the stress and strain distribution of the relevant section of the batter joint; (4) Through non-linear finite element analysis , including monotonic losding and horizontal low-frequency cyclic loading discuss the influence of the test parameters on the anti-seismic performance of the joint.Through research the following conclusions can be obtained: (1) When the seismic wave peak acceleration is 200gal, the maximum lateral displacement is up to 130.37mm. When the anti-seimic fortification intensity is 9degree, the maximum lateral displacement is up to 74.45mm, and the maximum horizontal force is 499.25kN. (2) Under the elastic state, the force and displacement satisfies linear relationship. The stress distribution of the joint presents eccentric state of tension and compression. According to stress of reinforced concrete by the analysis of the elastic constitutive relation design the batter joint, the degree of safety of the bearing capacity is slightly higher and the design somewhat conservative which is suitable for the preliminary analysis and design. (3) Under the nonlinear state, analytical results show that the web reinforcement ratio of pile cap, strength of concrete and certain reinforcement distribution in the core of piles are important to the ductility and dissipation capacity of the connection, axial load ratio is important to the bearing capacity, the ductility and stiffness performance and dissipation capacity of the joint. Considering the bond-slip between reinforcement and concrete, the ductility and energy dissipation capacity of the joint decrease in a certain degree, but the bearing capacity and stiffness change little.