Rotational Restraint to Purlins Provided by Standing Seam Roof Systems

Table 2

Comparison of rotational restraint rigidity calculated by Equation (4) 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
HX-1	Z250 × 70 × 20 × 2.5	0.5	1922	2959	1165	1297	−10.16
HX-7	Z250 × 70 × 20 × 2.5	0.6	1922	3136	1192	1391	−14.32
HX-5	Z250 × 70 × 20 × 2.5	0.6	1922	3136	1192	919	29.69
HX-3	Z200 × 70 × 20 × 2.5	0.5	2157	2959	1247	1302	−4.19
HX-2	Z200 × 70 × 20 × 2.5	0.6	2157	3136	1278	1432	−10.76
HX-4	Z200 × 70 × 20 × 2.0	0.6	1104	3136	817	841	−2.89
HX-6	Z200 × 70 × 20 × 2.0	0.6	1104	3136	817	690	18.36
HX-8	Z200 × 70 × 20 × 2.0	0.8	1104	3439	836	680	22.92
Mean							3.58
COV							17.28