Design And Seismic Behavior Of The Integral Casting And Fabricated Vertical Pile Joint On Pile-Wharf Structures

A wharf of a port occupies an important position to a national economy and the social development. Some huge economical loss and bad effect will be made because to the interruption of the port. Previous earthquakes have demonstrated that pile-wharf structures are susceptible to damage. Earthquake reconnaissance efforts suggests that damage results from liquefaction of surrounding soil, which induces large deformation demands on the structure and may result in structural failure , or inadequate structural performance, which is influenced by and may be caused by the response of the soil.A new design method of the integral casting and fabricated vertical pile joint which have a dissipation slit is brought forward based on tenon-and-mortise work, to improve the seismic behavior of the pile wharf structure in China. Damping material is filled in the dissipation slit which is set in the new vertical pile joint. The antiseismal performance and destructive mechanism of the joint is discussed under the monotonic and the low-cyclic reversed load by the ANSYS. So, the previous preparation for experimental study of this new joint can be done.The major contents are summarized as follows:1. a dissipation slit which is filled with damping rubber is brought forward in the integral casting and fabricated vertical pile joint based on the failure mode of the current joints in the earthquake, to protect the vertical pile by the dissipation slit.2. The design model and construction feature of this new vertical pile joint is brought forward based on the characteristics of the integral casting and fabricated vertical pile joint.3. ANSYS analysis is done in the new vertical pile joint. Then difference of the destructive mechanism and the energy dissipation capacity between the joint with dissipation slit and the joint without dissipation slit is discussed.4. Under the low-cyclic reversed load the new vertical pile joints which have different thickness of the dissipation slit, different height of the pile cap, different ratio of reinforcement at the core of the pile are analyzed, to discuss the effect of the joints' seismic behavior in these different parameters.5. Some farther measure is put forward to the connection at the top of the vertical.The results show that: the integral casting and fabricated vertical pile joint which have a dissipation slit can improve the vertical pile joint's construction and seismic behavior. So, the dissipation slit can protect the vertical pile.1. The failure position of the joint change from the vertical pile of the joint without dissipation slit to the core of the pile in the integral casting and fabricated vertical pile joint. This can protect the vertical pile and improve the seismic of the pile-wharf structures.2. The energy dissipation capacity of the integral casting and fabricated vertical pile joint is better than the joint without dissipation slit. The failure attendance of the new joint is reduced and the breakage of the pile-wharf structures is decreased by the damping rubber.3. The increment of reinforcement at the core of the pile can improve the ductility and energy dissipation capacity of the vertical pile joint. This play an important role to the improvement of the whole pile-wharf's seismic.