Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

International Journal of Concrete Structures and Materials

Table 4 Comparisons of model predictions with test results.

Specimens	Prestressing reinforcement ratios				Max. load		Tendon strains
	\( \rho_{pf}^{U} \)	\( \rho_{pfb}^{B} \)	\( \rho_{pfb}^{U} \)	\( \rho_{pf}^{U} /\rho_{pfb}^{U} \)	Test (kN)	Thy/Test	ɛ _pfu		Δɛ _pfu
	\( \rho_{pf}^{U} \)	\( \rho_{pfb}^{B} \)	\( \rho_{pfb}^{U} \)	\( \rho_{pf}^{U} /\rho_{pfb}^{U} \)	Test (kN)	Thy/Test	Test (mm/mm)	Model/Test	Test (mm/mm)	Model/Test	Equation (14)/Test	Equation (15)/Test
RU50	0.0019	0.0036	0.0014	1.36	47.2	1.03	0.0088	1.10	0.0032	1.45	1.16	1.62
RU70	0.0019	0.0052	0.0025	0.76	58.4	0.94	N.A	N.A	N.A	N.A	N.A	N.A
RO50	0.0053	0.0035	0.0013	4.08	80.2	0.95	0.0082	1.06	0.0020	1.34	1.14	0.94
RO55	0.0024	0.0030	0	–	116.1	0.81	0.0142	0.99	0.0040	0.92	0.74	0.11
TB45	0.0021	0.0025	0.0013	1.62	118.5	1.06	N.A	N.A	N.A	N.A	N.A	N.A
TO45	0.0034	0.0025	0.0012	2.83	150.3	0.94	0.0112	1.13	0.0043	1.39	1.11	0.64
Average Standard deviation						0.96 0.09		1.07 0.06		1.27 0.24	1.04 0.20	0.83 0.63