Rotational Restraint to Purlins Provided by Standing Seam Roof Systems

Table 1

Comparison of rotational restraint rigidity calculated by Equation (3) with test result by Liu et al. [20].

Test identification	Purlin section	trf (mm)	Rotational restraint rigidity (N·m·rad^−1·m^−1)				(%)
			Kz2	Ktor	Kz	Kzt
ML-8	Z250 × 60 × 20 × 1.5	0.6	424	3165	374	409	−8.50
ML-7	Z250 × 60 × 20 × 2.0	0.6	1006	3165	763	719	6.17
ML-17	Z250 × 60 × 20 × 2.0	0.6	1006	3165	763	712	7.22
ML-20	Z250 × 60 × 20 × 2.0	0.53	1006	3064	757	761	−0.47
ML-13	Z250 × 60 × 20 × 2.5	0.6	1965	3165	1212	1103	9.91
ML-14	Z250 × 60 × 20 × 2.5	0.53	1965	3064	1197	1120	6.90
ML-9	Z200 × 60 × 20 × 1.5	0.6	478	3165	415	447	−7.18
ML-10	Z200 × 60 × 20 × 1.5	0.53	478	3064	413	474	−12.84
ML-11	Z200 × 60 × 20 × 2.0	0.6	1132	3165	834	738	12.97
ML-19	Z200 × 60 × 20 × 2.0	0.6	1132	3165	834	825	1.05
ML-12	Z200 × 60 × 20 × 2.0	0.53	1132	3064	827	722	14.48
ML-18	Z200 × 60 × 20 × 2.0	0.53	1132	3064	827	803	2.93
ML-15	Z200 × 60 × 20 × 2.5	0.6	2211	3165	1301	1214	7.21
ML-16	Z200 × 60 × 20 × 2.5	0.53	2211	3064	1284	1181	8.74
Mean							3.47
COV							8.19