Abstract
Abstract In order to establish the appraisal target system, the principles and methods of the Fuzzy Analytic Hierarchy Process (FAHP) were described in aspects of structuring the comparative judgment matrix described by interval numbers, solving both the interval weight vector and the comprehensive weights of the general target detemuned by various layers, and selecting the strengthening proposal out of the various schemes. By an actual project of strengthening stone arch bridge, application of the principles and methods of the FAHP to detemune the optimal proposals was introduced. From the paper, it is visual to know how to select the optimal proposal from the various schemes by mathematical principle. It will promote the development of the systemization, standardization and theorization of bridge strengthening.
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