Stress-Strain Relation of Steel-Polypropylene-Blended Fiber-Reinforced Concrete under Uniaxial Cyclic Compression

Table 4

Fitting parameters for the relation between plastic strain and envelope unloading strain.

Specimens			a
S000P000	0.00	0.000	0.589	1.000
S000PA15	0.00	0.251	0.527	0.870
SB15P000	0.90	0.000	0.533	0.880
SB10PA15	0.60	0.251	0.528	0.871
SB15PA15	0.90	0.251	0.459	0.758
SB20PA15	1.20	0.251	0.497	0.820
SA15PA15	0.45	0.251	0.496	0.818
SC15PA15	1.20	0.251	0.497	0.821
SB15PA10	0.90	0.167	0.502	0.829
SB15PA20	0.90	0.334	0.496	0.819
SB15PB15	0.90	0.420	0.493	0.813
SB15PC15	0.90	0.594	0.467	0.770

Note: a is the basic characteristic parameters of fitting results; represents the ratio of plastic strain fitting parameters related to that of the control concrete specimen.