Modified PCI Multipliers for Time-Dependent Deformation of PSC Bridges

Table 2

PCI Bridge Design Manual improved multipliers [20].

Load condition	Erection time		Final time
	Formula	Average	Formula	Average
Initial prestress		1.96		2.88
Prestress loss		1.00		2.32
Self-weight		1.96		2.88
Dead load on plain beam	1.00	1.00		2.50
Dead load on composite beam	1.00	1.00		2.50

 = ultimate creep coefficient for loads applied immediately after transfer, and the average value is 1.88.  = ultimate creep coefficient for loads applied at time of erection, and the average value is 1.50.  = creep coefficient for loading applied immediately after transfer and strains measured at time of erection, and the average value is 0.96.  = time-dependent prestress loss at erection divided by total time-dependent prestress loss, and the average value is 0.60.  = Bazant’s aging coefficient, and the average value is 0.70.