Two-Way Flexural Behavior of Donut-Type Voided Slabs

Table 4 Test results of specimens.

ID	Calculation		Test results								Comparison
ID	P_n kN	I_e × 10⁶ mm⁴	P_cr kN	δ_cr mm	P_y kN	δ_y mm	P_u kN	δ_u mm	μ	K kN/mm	\( \frac{P_{u} }{P_{n} } \)	\( \frac{{P_{u} }}{{P_{u,Solid} }} \)	\( \frac{K}{K_{Solid} } \)	\( \frac{I_{e} }{I_{e,Solid} } \)
Solid	1119	2101	205.9	1.53	824.1	12.95	1238.5	56.60	4.4	5.27	1.10	–	–	–
TF–D–S–P.P	1119	1643	170.8	1.45	823.3	17.77	1172.5	60.69	3.4	6.85	1.05	0.95	0.73	0.78
TF–D–M–P.P	1172	1798	284.7	2.78	847.8	17.16	1225.1	70.50	4.1	6.54	1.05	0.99	0.78	0.86

P_n Ultimate flexural load calculated with the yield line method
P_cr Load at initial flexural crack occurred deduced by strain of bottom rebar
P_y Load when one of bottom rebar strain is reached by 0.24%
δ_cr Deflection at the center under cracking load / δ_y Deflection at the yield load