Flexural Behavior of the Innovative CA-UHPC Slabs with High and Low Reinforcement Ratios

Table 6

Relative stiffness degradation.

Specimen ID	Flexural cracking		Yielding state		Ultimate state
	Δcr/Δu	kcr/k0	Δy/Δu	ky/k0	Δu/Δu	ku/k0
R0-S-8	0.44	0.71	/	/	1.00	0.26
R0-S-5	0.33	0.91	/	/	1.00	0.32
R0-N-8	0.28	0.79	/	/	1.00	0.24
R1.13-S-8	0.04	0.72	0.19	0.37	1.00	0.07
R1.13-S-5	0.03	0.80	0.12	0.51	1.00	0.06
R1.13-N-8	0.03	0.93	0.16	0.49	1.00	0.07
R3.45-S-8	0.02	0.90	0.08	0.73	1.00	0.05
R3.45-S-5	0.02	0.97	0.13	0.50	1.00	0.05
R3.45-N-8	0.01	0.98	0.11	0.59	1.00	0.06