High-Performance Steel Bars and Fibers as Concrete Reinforcement for Seismic-Resistant Frames
Table 4
Measured yield point.
Specimen
Sheara kN (kip)
Mean
Drift ratio %
Mean
Secant stiffnessb kN/mm (kip/in.)
Beams
#1
CC4-X
South +
206 (46.3)
174 (39.2)
0.93
0.97
29.5 (168)
South −
176 (39.6)
1.03
North +
180 (40.5)
1.17
North −
134 (30.2)
0.76
#2
UC4-X
South +
202 (45.3)
198 (44.6)
1.52
1.49
21.8 (125)
South −
194 (43.7)
1.38
North +
199 (44.7)
1.68
North −
198 (44.6)
1.36
#3
UC2-F
South +
202 (45.4)
196 (44.1)
1.37
1.28
25.1 (144)
South −
185 (41.7)
1.26
North +
218 (49.1)
1.29
North −
178 (40.1)
1.19
Columns
#4
CC-3.3-20
South +
238 (53.4)
244 (54.8)
0.67
0.78
42.0 (240)
South −
252 (56.7)
0.78
North +
242 (54.4)
0.83
North −
243 (54.7)
0.85
#5
UC-1.6-20
South +
—c
208 (46.7)
—c
1.41
20.2 (115)
South −
204 (45.9)
1.39
North +
210 (47.3)
1.44
North −
209 (47.0)
1.39
#6
UC-1.6-20F
South +
—c
224 (50.4)
—c
1.42
21.6 (123)
South −
221 (49.6)
1.28
North +
—c
—c
North −
228 (51.2)
1.55
aShear force measured at first yield of the longitudinal reinforcement. Top and bottom bars were instrumented with strain gages at the north and south faces of the central stub. The yield point is based on the value of reported in Table 1.
bSecant stiffness to first yield of the longitudinal reinforcement. In columns, P-delta effects are removed.
cMeasurement not available.
