Long-term bending properties of cross-laminated timber made from Japanese larch under constant environment

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 2 Results of the creep tests

No	Density (kg/m³)	Test period (days)	δ₀ (mm)	Estimated value
No	Density (kg/m³)	Test period (days)	δ₀ (mm)	m	n	δ_50y/δ₀
1–37	511	138	21.04	0.357	0.174	1.33
2–37	506	48	22.72	0.184	0.251	1.59
3–37	525	48	19.50	0.102	0.277	1.59
4–37	517	138	20.67	0.301	0.186	1.35
5–37	507	142	21.37	0.158	0.250	1.53
6–37	513	183	21.14	0.238	0.221	1.49
7–37	504	183	21.81	0.272	0.211	1.46
8–37	513	140	20.67	0.143	0.259	1.57
9–37	517	140	20.93	0.196	0.231	1.49
10–37	512	156	21.56	0.189	0.238	1.51
11–37	507	138	21.55	0.294	0.208	1.48
Mean	512		21.18	0.221	0.228	1.49
SD	6		0.81	0.078	0.031	0.09

δ₀ is initial deflection, δ_50y is predicted deflection after 50 years, m and n are constants (see Eq. 4), and SD is the standard deviation