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

Table 1

Description of test specimens.

Specimen		Axial load; 𝐴g  𝑓^′𝑐	𝑓^′𝑐; MPa (ksi)	Longitudinal reinforcement^a					Transverse reinforcement^a
				Bars per layer^a	𝑑𝑏; mm (in.)	𝑓𝑦^b; MPa (ksi)	𝑓𝑢; MPa (ksi)	𝜀𝑠𝑢; %	𝑠; mm (in.)	𝑑𝑏; mm (in.)	𝑓𝑦𝑡^b; MPa (ksi)
Beams^c
#1	CC4-X	0	41 (6.0)	4	22 (7/8)	448 (65)	676 (98)	15.9	51 (2.0)	9.5 (3/8)	469 (68)
#2	UC4-X	0	43 (6.2)	4	18 (0.71)^d	669 (97)	807 (117)	10.4	51 (2.0)	9.5 (3/8)	469 (68)
#3	UC2-F	0	44 (6.4)	4	18 (0.71)^d	669 (97)	807 (117)	10.4	102 (4.0)	9.5 (3/8)	469 (68)
Columns^e
#4	CC-3.3-20	0.20	54 (7.8)	3	22 (7/8)	441 (64)	634 (92)	20.3	64 (2.5)	9.5 (3/8)	428 (62)
#5	UC-1.6-20	0.21	43 (6.3)	2	19 (3/4)^f	917 (133)	1160 (168)	8.6	64 (2.5)	9.5 (3/8)	434 (63)
#6	UC-1.6-20F	0.19	51 (7.4)	2	19 (3/4)^f	917 (133)	1160 (168)	8.6	114 (4.5)	9.5 (3/8)	434 (63)

^aBar layout is symmetrical with identical top and bottom layers. Transverse reinforcement consists of single rectilinear hoops spaced at 𝑠=𝑑/4 (specimens #1, #2, #4, and #5) or 𝑠≈𝑑/2 (specimens #3 and #6 with fibers).
^bDefined using the 0.2%-offset method.
^cBeams tested at The Pennsylvania State University: 𝑏=406 mm (16 in.), ℎ=254 mm (10 in.), and 𝑑=203 mm (8 in.).
^dProvided by SAS Stressteel.
^eColumns tested at Purdue University: 𝑏=229 mm (9 in.), ℎ=305 mm (12 in.), 𝑑=254 mm (10 in.).
^fProvided by MMFX Technologies.