Ductility Design of Reinforced Very-High Strength Concrete Columns (100–150 MPa) Using Curvature and Energy-Based Ductility Indices

International Journal of Concrete Structures and Materials

Table 2 Summary of ductile design guidelines in codes of practice.

Code	Ductility index	Compressive strength limit	Ductility LEVEL			Lateral reinforcement requirement for ductility
Code	Ductility index	Compressive strength limit	Category 1	Category II	Category III	Category 1	Category II	Category III
AS 3600 (2009)	Energy-based ductility	100 MPa	OMRF	IMRF	–	Yes	Yes	No
AS 3600 (2009)	Energy-based ductility	100 MPa	2.0	3.0	Refer to NZS 1170.5 (2004)
CSA (2004)	Curvature and displacement ductility	80/80^a MPa	CDS	MDS	DS	No	Yes	Yes
CSA (2004)	Curvature and displacement ductility	80/80^a MPa	1.5	2.5	4.0
ACI 318 (2011)	Curvature and displacement ductility	No limit^b	OMRF	IMRF	SMRF	Yes	Yes	Yes
ACI 318 (2011)	Curvature and displacement ductility	No limit^b	1.0	1.7	2.7
NZS 3101.1 (2006)	Curvature ductility	100/70^a MPa	NDS	LDS	DS	Yes	Yes	Yes
NZS 3101.1 (2006)	Curvature ductility	100/70^a MPa	1.25	3.0	6.0
EC 8 (2004a) and EC 2 (2004)	Curvature and displacement ductility	100 MPa	DCL	DCM	DCH	No	No	Yes
EC 8 (2004a) and EC 2 (2004)	Curvature and displacement ductility	100 MPa	1.5	3.0	4.5