Experimental Investigation of the Shear Behavior of a Concrete Beam without Web Reinforcements Using External Vertical Prestressing Rebars

Table 4

Main experimental results.

Specimen	γp	ηp	PMC (kN)	PSC (kN)	PCSC (kN)	PU (kN)	δU (mm)	Failure mode
RC_1	0	1	70	—	—	255	3.04	DT
RC_2	0	1	80	—	—	290	3.76	DT
EP_P22_S1	0.20	0.91	69.10	159.40	314.5	505.0	16.54	SC
EP_P22_S2	0.28	0.87	75.60	199.30	318.5	519.5	9.85	SC
EP_P22_S3	0.24	0.89	89.80	183.20	307.2	527.6	12.20	SC
EP_P26_S3	0.28	0.87	75.90	144.50	328.4	535.2	21.06	SC
EP_P18_S3	0.20	0.91	96.90	159.40	308.6	517.6	9.88	SC

P_MC is the load corresponding to the first flexural crack; P_SC is the load corresponding to the first shear crack; P_CSC is the load applied to form CSC; P_U is the load at shear capacity; δ_U is the midspan displacement at shear failure; DT represents diagonal tension failure; SC represents shear compression failure.