Prediction of Long-Term Prestress Loss and Crack Resistance Analysis of Corroded Prestressed Concrete Box-Girder Bridges

Table 2

Comparison of experimental and theoretical values of effective prestressing force.

Beam	Tension stress (MPa)	Corrosion rate (%)	Mc (kN·m)	Texp (kN)	Tcal (kN)	Tcal/Texp	Source
PCB8	1395	1.28 (mc)	18	194	184.3	0.95	[37]
CB5	1395	12.06 (mc)	16.5	177.2	166.4	0.94
CB6	1395	19.47 (mc)	15	160.3	158.3	0.99
CB7	1395	26.96 (mc)	13.5	143.5	149.3	1.04
PCB-2	1312.1	3.22 (ms)	20.7	130.1	131.9	1.01	[38]
PCB-8	1312.1	7.53 (ms)	17.5	103.9	99.6	0.96

Note. m_c = maximum cross-sectional area loss rate, m_s = mass loss rate, M_c = cracking moment, T_exp = experimental value of effective prestressing force calculated based on the cracking moment, and T_cal = theoretical value of effective prestressing force.