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

Table 3

Safety grades and corresponding ranges of the five indices.

Index	Bearing capacity	Deflection/span	Cracks	Reinforcement corrosion	Concrete carbonation depth
Level a	1.00∼1.10	0∼1/400	0∼0.2	−150∼0	0∼0.25
Level b	0.95∼1.00	1/400∼1/350	0.2∼0.35	−200∼−150	0.25∼0.5
Level c	0.90∼0.95	1/350∼1/250	0.35∼0.5	−350∼−200	0.5∼0.75
Level d	0.80∼0.90	1/250∼1/150	0.5∼0.65	−500∼−350	0.75∼1.0