Torsional Strengthening of RC Beams with Continuous Spiral Near-Surface Mounted Steel Wire Rope

International Journal of Concrete Structures and Materials

Table 4 Experimental results of the tested beams.

Beam code	Str. Tech.	f’c MPa	\(\frac{{\rho_{SNSM} }}{10000}\)	T_cr KN m	%Incr.T_cr	T_u KN m	%Incr.T_u	θ_u deg./m	%Incr. θ_u
Control	Un-str.	48	0	4.50	0	10.75	0	4.77	0
SNSM113	Spiral NSM Steel wire rope		86	14.75	228	25.75	140	9.76	105
SNSM141			69	7.50	67	22.75	112	12.86	170
SNSM188			52	7.00	56	17.90	67	7.97	67
SNSM283			35	7.00	56	15.78	47	6.14	29
SNSM566			17	6.25	39	12.58	17	5.78	21

Str. Tech. strengthening technique, %Incr.T_cr percentage increase in cracking torque, %Incr.T_u percentage increase in ultimate torque, %dec. θ_u percentage decrease in ultimate twist angle, Un-str. unstrengthened.