Experimental Analysis and Failure Criterion of Plain Concrete Subjected to Biaxial Loading under Fixed Lateral Loading

Table 2

The eigenvalues of biaxial loading stress-strain curves of plain concrete with different strengths.

Stress ratio α	Strength grade
	C30		C40		C50
	Compressive stress	Tensile stress	Compressive stress	Tensile stress	Compressive stress	Tensile stress
0	21.14	1.93	27.61	2.55	45.45	2.67
0.1	26.78	1.66	38.45	2.28	50.13	2.33
0.2	27.73	1.34	43.56	1.99	58.65	2.20
0.3	29.82	1.22	42.67	1.76	60.99	1.99
0.4	27.15	0.93	47.08	1.48	60.37	1.78
0.5	30.23	0.83	38.29	1.23	56.08	0.96