Estimating Life Expectancies of Highway Assets, Volume 2: Final Report (2012)

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228 A p p e n d i x e Cost Models for Bridge Preservation Bridge construction/replacement cost estimation models (Saito et al. 1990): BRTC BL DW= ( ) ( )0 155 0 903 0 964. ( ). . E1 Where BRTC = total bridge construction/replacement cost, in $1000; BL = bridge length, in ft; DW = bridge deck width (out-to-out), in ft. Equation (E1) can be used to calculate the initial bridge construction/replacement cost for the bridge using traditional steel. For the bridge using stainless steel, the cost difference between the traditional carbon steel and the stainless bridge is added to the result from Equation (E1) to get the initial construction costs. AC BRTC P PinitialStainlessSteel stainless tr= + − aditional DW( )∗ ( )E2 Where ACinitialStainlessSteel is bridge construction/replacement cost for stainless steel deck bridge; Ptraditional is the unit price of traditional steel; Pstainless is the unit price of stainless steel; WD is the weight of the bridge deck reinforcement. Deck replacement or rehabilitation cost models (Saito et al. 1990): AC BL DW Cdeck replacementTraditionalSteel D− = ∗ ∗ P deck replacement StainlessSteelAC BL ( )E3a − = ∗DW C P P W AC DP stainless traditional D∗ + −( )∗ ( )E3b deck rehab DRBL DW C− = ∗ ∗ ( )E4 Where ACdeck replacementTraditionalSteel− is deck replacement cost for traditional steel deck; ACdeck replacementStainlessSteel− is deck replacement cost for stainless steel deck; CDP is the unit cost of deck replacement, in $/ft 2; CDR is the unit cost of deck rehabilitation, in $/ft 2.