Abstract
Based on fuzzy decision theory, multi objective fuzzy optimization is done for three dynamic model scheme of self-anchored cable-stayed suspension bridge. Combining the fuzzy decision method with engineering practice and using two comparison theory solves the problem of quantifying the qualitative indexes. Comparison results show that it is more reasonable to place viscous dampers between main tower and girder, with longitudinal displacement on mid-span of girder on the same time. This method can provide a reference for structure selection in practical conceptual design phase.
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