Flexural Ductility, Stiffness, and Toughness of New Voided Reinforced Concrete One-Way Slab Using Waste Plastic Bottles

Table 4

Ductility and toughness indices.

	ST100SO	ST130SO	ST130VO	ST140VO	ST150VO
Ductility (∆u/∆y) conventional method	1.73	1.31	3.31	2.61	2.73
S	5.41	8.39	17.39	6.92	17.50
Ductility by energy method (μo)	1.57	1.17	3.31	1.02	1.70
Response of load-deflection curve	Trilinear	Trilinear	Bilinear	Trilinear	Bilinear
Average flexural stiffness (AFS) kN/mm Pu/∆u	5.05	9.31	6.93	9.62	13.94
Toughness (kN·mm)	323.511	258.8	255.75	235.83	174.93