Study On Structural Strengthening And Restructuring Technologies Of Gravity Wharf

Structural strengthening and restructuring of wharf, which involves various technology measures such as inspection, evaluation, reinforcement and reconstruction, is to rehabilitate the damaged wharf for continued service, or enhance the bearing capacity and stability of wharf for load augment and function alteration. As some wharves exceed designed service life, coupled with vessels tend to specialization and larger scale, the nationwide structural reinforcement and reconstruction of wharf is around the corner. However, research work in this field is limited currently, especially in the design theory and calculating method of reinforcement and reconstruction for gravity wharf.This dissertation carries out a series of research work for the structural strengthening and restructuring technologies of gravity wharf by utilizing theoretical analysis and FEM numerical simulation. The main contents and conclusions are as follows:1. The research status, application prospect and critical technologies of wharf structure reinforcement and reconstruction are analysed, and the necessity and feasibility of this research are confirmed.2. The merits and demerits, and the applicable conditions of current schemes for wharf structure reinforcement and reconstruction are summarized, and the principles are put forward. Moreover, it is clear that the pile-addition method demonstrates general applicability.3. The components and characteristics of pile-gravity hybrid structure are introduced, and loads analysis is conducted. Furthermore, the applicable calculating theories including earth pressure and pile bearing capacity for this hybrid structure are selected.4. The simplified calculating method for analysis of stability against sliding and overturning is established through theoretical derivation. Besides, the modified method which is based on the current codes is derived for practical application.5. Based on the FEM software ANSYS Workbench, the numerical simulation model for pile-gravity hybrid structure is established, including constitutive model for structure and soils, contact interface modelling, simulation domain, boundary conditions, meshing, etc.6. The stability analysis method and FEM model, which are established in this dissertation, are applied to an engineering project-wharf structure reinforcement and reconstruction for Berth8of Laizhou District, Yantai Port. More importantly, the results indicate adding piles could diminish the displacement, stress and slippage of wharf structure effectively, and improve the wharf stability and bearing capacity markedly.7. Some reasonable suggestions are put forward for future research work, especially in the junction of new and old structures, stress concentration area, optimization, physical model experiment, in-situ detection, and construction technology.