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

Table 4

Safety grades and corresponding (normalized) ranges of the five indices.

Index	Bearing capacity	Deflection/span	Cracks	Reinforcement corrosion	Concrete carbonation depth
Level a	0.667∼1.000	0.625∼1.000	0.692∼1.000	0.700∼1.000	0.750∼1.000
Level b	0.500∼0.667	0.571∼0.625	0.462∼0.692	0.600∼0.700	0.500∼0.750
Level c	0.333∼0.500	0.400∼0.571	0.231∼0.462	0.300∼0.600	0.250∼0.500
Level d	0∼0.333	0∼0.400	0∼0.231	0∼0.300	0∼0.250