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

Figure 5

Extension model results. (a, b) The plane axes, respectively, represent safety level and index; the vertical axis represents the single index correlation degree; the blue dot represents the maximum correlation degree of each index and the red dots represent the other correlation degrees. (c, d) The inverse triangle (blue) and regular triangle (red), respectively, represent the upper and lower boundary of the comprehensive weight (which is an interval number). (e) The plane axes represent the safety level and the safety appraisal objects (beams 2 and 12); the vertical axis represents comprehensive correlation degree of each safety level; the inverse triangle (blue) and regular triangle (red), respectively, represent the upper and lower boundary of the comprehensive correlation degree (which is an interval number). Relationship: the comprehensive weight (i.e., (c) and (d)) integrates the single index correlation degree (i.e., (a) and (b)) into a comprehensive correlation degree (i.e., (e)). BCsss, bearing capacity; DE/SP, deflection/Span; CR, cracks; RC, reinforcement corrosion; CCD, concrete carbonation depth.