Experimental Study of Hollow RC Beams Strengthened by Steel Fiber under Pure Torsion

Table 9

Effect of steel fiber ratio on cracking and ultimate torsional moment.

Beam no.	Vf %	Cracking torque (Tcr) (kN.m)	Increase in Tcr according to H1 (%)	Ultimate torque (Tu) (kN.m)	Increase in Tu according to H1 (%)
H1	0	8.3	—	21.1	0
H2	0.5	15.77	90	26.24	24.4
H3	0.75	17.59	112	29.51	45.6
H4	1	19.25	132	32.09	62.7