Table 4.

LBS results from Experimental tests, ABAQUS, and Eqs. (1), (6), and (20).

Specimen	$C$ $\left(\text{mm}\right)$	$d_b$ $\left(\text{mm}\right)$	$L\left(\text{mm}\right)$	$f_c^{\prime }\left(\text{MPa}\right)$	$u_{\mathit{test}}\left(\text{MPa}\right)$	$u_1\left(\text{MPa}\right)$	$u_6\left(\text{MPa}\right)$	$u_{20}\left(\text{MPa}\right)$	$\frac{u_1}{u_{\mathit{test}}}$	$\frac{u_6}{u_{\mathit{test}}}$	$\frac{u_{20}}{u_{\mathit{test}}}$
R12C2L2F155	24	12	24	155.1	57.54 Num	19.636	47.294	57.51	0.341	0.822	0.999
R12C4L2F155	48	12	24	155.1	82.89 Num	27.903	70.595	82.9	0.337	0.852	1
R12C4L3F155	48	12	36	155.1	80.81 Num	27.903	70.595	81.007	0.345	0.874	1.002
R14C1L1F155	14	14	14	155.1	37.74 Num	13.594	31.633	38.235	0.36	0.838	1.013
R14C3L1F155	42	14	14	155.1	68.52 Num	24.256	60.032	67.61	0.354	0.876	0.987
R14C1L2F155	14	14	28	155.1	36.52 Num	13.594	31.633	36.342	0.372	0.866	0.995
R16C2L1F155	32	16	16	155.1	52.83 Exp	19.636	47.294	51.191	0.372	0.895	0.969
R16C2L2F155	33	16	32	155.1	51.93 Exp	19.96	48.167	50.121	0.384	0.928	0.965
R16C4L1F155	64	16	16	155.1	76.11 Num	27.903	70.595	73.179	0.367	0.928	0.961
R18C3L2F155	54	18	36	155.1	55.262 Exp	24.256	60.032	57.51	0.439	1.086	1.041
R18C1L3F155	18	18	54	155.1	29.489 Exp	13.594	31.633	29.71	0.461	1.073	1.008
R18C4L3F155	72	18	54	155.1	61.97 Num	27.903	70.595	65.1	0.45	1.139	1.051
R20C4L3F155	80	20	60	155.1	57.56 Num	27.903	70.595	61.468	0.485	1.226	1.068
R20C2L4F155	40	20	80	155.1	38.18 Num	19.636	47.294	39.908	0.514	1.239	1.045
R20C4L2F155	80	20	40	155.1	58.84 Num	27.903	70.595	63.361	0.474	1.2	1.077