Extension Model for Safety Appraisal of Existing Concrete Members Based on an Improved Comprehensive Weighting Method

Figure 6

AHP-Fuzzy comprehensive evaluation results. (a, b): The plane axes represent the safety level and index, respectively; the vertical axis represents the single index membership degree; the column height represents the value of the membership degree of each index for each safety level. (c) The yellow column height represents the weight value of each index calculated by AHP. (d): The plane axes represent the safety level and the safety appraisal objects (beams 2 and 12); the vertical axis represents the comprehensive membership degree of each safety level; the blue column represents the maximum membership degree of beams 2 and 12, and the red columns represent other membership degrees. Relationship: the weight (i.e., (c)) integrates the single index membership degree (i.e., (a) and (b)) into the comprehensive membership degree (i.e., (d)). BC: bearing capacity; DE/SP, deflection/span; CR, cracks; RC, reinforcement corrosion; CCD, concrete carbonation depth; AHP, analytic hierarchy process.