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International Journal of Concrete Structures and Materials

Table 4 Test results of reinforcements.

From: Experimental Evaluation of Effect Factors on Seismic Performance of Concrete Columns Reinforced with HTRB630 High-Strength Steel Bars

Mechanical properties

HRB400(C)

HTRB630(D)

Yield strength bottom limit fy’(MPa)

453.44

738.34

Yield starting point strain εy (× 10–3)

2.302

3.355

Elastic modulus Es (GPa)

190.34

219.08

Starting point strain of strain hardening section εsh (× 10–3)

25.27

12.38

Initial modulus of strain hardening section Esh (MPa)

5.61

9.59

Ultimate strength fu (MPa)

614.76

928.50

Strain at strength limit point εult (× 10–3)

144.44

89.64

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