A port and harbor structure has a long lifetime and must be expected to meet demands during its lifetime that cannot be foreseen. Steel and concrete as principle structural materials tend to deteriorate due to physical and chemical agents under harsh marine environments and loss in structural performance or even structural collapse may be consequences. At the initial design stage, designers make several assumptions, in which probably worst conditions are considered with certain safety margins, so that the structure can keep its structural performance over respective required levels. However, serious deterioration of structural members may be caused by insufficient durability design with optimistic assumptions and/or by lack of proper maintenance work.
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