Behavior of Strengthened Composite Prestressed Concrete Girders under Static and Repeated Loading

Table 5

Summary of test results for girders G1 and P1.

Test results	Girder G1	Girder P1	(P1/G1), %
Initial camber, mm	22	31	140.9
Total Pcr, kN	361.6	425	117.5
Mcr, kN·m	1085	1275	117.5
Δcr, mm	32	42	131.3
Total Py, kN	565.3	711.3	125.8
My, kN·m	1696	2134	125.8
Δy, mm	96	92	95.6
Curvature ɸy, 1/mm × 10^−5	7.92	7.36	95.8
Total Pu, kN	656.3	775.3	118.1
Mu, kN·m	1969	2326	118.1
Δu, mm	186	165	88.7
Residual deflection, mm	92	78	84.8
Curvature ɸu, 1/mm × 10^−5	22.13	15.85	71.6
Ductility index, Δu/Δy	1.94	1.79	92.4
Δ at service load level (70% of ultimate load), mm^#	36	32	88.9

Total absolute measured downward net deflection, ^#net deflection after subtracting camber value.