A Comprehensive Reliability Assessment Method for Existing Railway Bridges Based on Bayesian Theory

Table 4

Durability state classes of existing railway bridges.

Risk factor level	Bridge durability	Risk probability interval
I	Structural elements of the bridge are intact and no deterioration of materials occurs
II	Minor defects in structural elements of the bridge, minor deterioration of materials, crack widths not exceeding limits
III	Moderate defects in structural elements of the bridge, partial deterioration of materials, crack widths over limits
IV	Significant defects in the structural elements of the bridge, significant deterioration of the material, and severe excess crack widths
V	Significant defects in the structural elements of the bridge, complete deterioration of materials, crushed concrete, and fractured reinforcement