Prediction-Based Maintenance of Existing Bridges Using Neural Network and Sensitivity Analysis

Table 1

Potentially influencing factors.

Attributes (unit)
Bridge geometry factors	Length (m)
	Width (m)
Environmental factors	Elevation (m)
	Yearly highest and lowest temperatures (°C)
	Carbon dioxide concentration (ppm)
	Airborne salt concentration (mdd·NaCl)
	Yearly average snowfall (cm)
	Yearly average rainfall (cm)
Loading condition	Daily traffic volume (vehicles/day)^a
	Rate of the large-size vehicles (%/day)
Other	Years in service (years)
	Bridge type

^aStatistics on traffic volume include large and small vehicles [37].