Analysis And Evaluation For Durability Of Internal River High-Pile Wharf

With development of China's industrialization and urbanization process, the center region of economic growth has changed from coastal cities to interior. To develop internal river transportation with large capacity and low resources consumption is an essential approach to improve the sustained economic development in China. Obviously it has great potential in near future.The high-pile wharf, a common form of wharfs, characterized by lightweight structure, strong ability of reduction of wave, easy construction and some other advantages. While compared with other forms of wharf, the durability of a high-pile wharf is poor. It's an important subject with both social meaning and science significant that how to extent usage year of high-pile wharf by improving durability as well as lowering maintenance cost and saving construction material. The durability of concrete structure involves various and multi-level factors. Based on other scholars' achievements in scientific research, this article has given a comprehensive analysis about effect factors of the durability of internal river piled wharf in terms of environment and structure. The article has come up with a multilevel fuzzy synthesis evaluation mode and residual service-life prediction toward to the durability of internal river high-pile wharf, according to the theory of fuzzy mathematics and current standard in China, which has provided an idea and reference for evaluating as well as predicting the durability of high-pile wharf. What's more, the article has proposed several suggestions on it.The main tasks are as following:(1) Learning others'research way, methods and achievements on durability by wildly reading relative literature information about concrete structure, especially hydraulic construction; in view of the characteristics of internal rivers' environment, listing and analyzing the main factors that may lower the durability, such as concrete neutralization, chemical, cycle of freezing and thawing and corrosion of steel; listing the reasons, mechanism of action, consequences that may influence the above factors, and interactions and relationships in those factors; listing Mathematical model of concrete deterioration and corrosion of steel so as to provide a basis and formulas for durability and predicting residual service-life.(2) Using interrelated concepts and theories for the durability is easily broke and complicate; establishing multiple fuzzy comprehensive evaluation model toward the durability of high-pile wharf which measured by concrete surface damage, concrete crack and steel corrosion. And these three index are defined by constructional element; taking the research results of first stage high pile frame wharf project of Tieniu bu in Xiangtan Hunan as example, and checking the results.(3) Dividing the predictions of the corresponding high-pile wharfs residual service-life based on calculation result in multiple fuzzy comprehensive evaluation model; taking the division methods in the mathematical model of both other scholars and relative standards as examples and checking the methods so as to ensure their rationality.(4) Reading carefully new scientific study about durability in domestic and overseas; from two aspects of material and construction, putting forward the technical measures and the managerial measures regard to current construction of internal rivers'high-pile wharfs with practical guiding significance and reference value; providing a way for designing, constructing and maintaining other wharfs by combination of other scholars'research achievements and the author's practical experience;...