Experimental Study of Composite Members in Spatial Grid Structure Subjected to Ultralow-Cyclic Axial Force

Table 5

Main parameters of skeleton curves of specimens.

Test number	Tension				Compression
	Py (kN)	Δy (mm)	Pmax (kN)	Δu (mm)	Pmax (kN)	Δu (mm)
S24-I	193.613	6.876	276.931	15.671	−223.207	−15.405
S27-I	236.701	9.712	310.712	15.454	−245.411	−16.605
S30-I	248.279	10.348	313.936	15.024	−250.962	−14.784
S24-II	187.005	7.738	253.518	13.153	−226.858	−13.924
S27-II	229.278	9.627	280.554	13.153	−236.005	−15.450
S30-II	257.108	11.112	286.943	13.108	−230.49	−15.839
S24-III	183.125	4.345	303.126	26.352	−218.316	−15.721
S27-III	254.281	8.896	325.905	26.184	−232.554	−15.998
S30-III	219.354	6.796	332.756	26.261	−246.102	−15.914
S24-IV	158.046	3.511	281.098	14.245	−203.501	−16.422
S27-IV	248.225	10.268	305.756	14.221	−222.502	−15.425
S30-IV	270.506	11.200	303.371	14.237	−242.985	−15.754
S24-V	153.669	1.659	286.565	14.175	−218.058	−16.222
S27-V	233.934	7.817	299.218	14.252	−225.736	−16.313
S30-V	268.177	10.835	308.000	14.1	−242.265	−13.889
S24-VI	95.925	1.740	293.631	14.718	−254.769	−16.230
S27-VI	176.508	3.292	315.219	15.305	−234.285	−16.941
S30-VI	190.305	3.980	321.312	15.365	−248.633	−14.996