High-Performance Steel Bars and Fibers as Concrete Reinforcement for Seismic-Resistant Frames

Table 3

Maximum measured shear force and drift ratio.

Specimen		𝑉max^a		𝑣max^b		𝜃max^c
		kN (kip)		𝑓^′𝑐 MPa (psi)		%
		+	−	+	−	+	−
Beams
#1	CC4-X	242 (54.4)	217 (48.8)	0.46 (5.5)	0.41 (4.9)	>10	5.0
#2	UC4-X	234 (52.5)	226 (50.7)	0.43 (5.2)	0.42 (5.0)	>10	5.1
#3	UC2-F	273 (61.4)	232 (52.1)	0.50 (6.0)	0.42 (5.1)	>10	5.1
Columns
#4	CC-3.3-20	252 (56.6)	266 (59.9)	0.59 (7.1)	0.63 (7.5)	5.1	5.0
#5	UC-1.6-20	228 (51.3)	228 (51.3)	0.60 (7.2)	0.60 (7.2)	5.2	4.8
#6	UC-1.6-20F	260 (58.4)	247 (55.5)	0.63 (7.5)	0.60 (7.2)	5.3	5.4

^aMaximum measured shear force during the loading protocol (Table 2).
^bShear stress calculated using 𝑉_max/(𝑏𝑑), expressed as a fraction of 𝑓^′_𝑐, where b, d, and 𝑓^′_𝑐 are given in Table 1.
^cMaximum drift ratio reached while maintaining a shear force not less than 75% of 𝑉_max in the same direction of loading. Maximum reported value includes the drift ratio attained during the final monotonic push in the positive direction.