Official Journal of the Japan Wood Research Society
Table 2 Influence of the slenderness ratio on the mechanical properties of the original bamboo columns
Group | λ | Slenderness ratio increases by percentage | Ultimate bearing capacity Pmax /kN | Percent reduction in the ultimate bearing capacity | Reduction rate of the ultimate bearing capacity | Lateral displacement at mid-height section /mm | Increase percentage | Ultimate hoop strain | Decrease percentage | Ultimate longitudinal strain | Decrease percentage |
|---|---|---|---|---|---|---|---|---|---|---|---|
11.52 | NA | 170.24 | NA | NA | 0.54 | NA | − 14,965 | NA | 4792 | NA | |
10 < λ < 20 | 12.32 | 6.94% | 119.98 | 29.52% | 2.85 | 1.63 | 199.48% | − 10,632 | 28.95% | 4570 | 4.63% |
13.98 | 21.35% | 102.83 | 39.60% | 1.69 | 1.69 | 211.12% | − 9863 | 34.09% | 4379 | 8.63% | |
21.84 | NA | 160.93 | NA | NA | 4.84 | NA | − 22,980 | NA | 4386 | NA | |
20 < λ < 30 | 24.26 | 11.08% | 145.58 | 9.54% | 0.91 | 5.73 | 18.33% | − 17,664 | 23.13% | 3945 | 10.05% |
27.43 | 25.60% | 131.22 | 18.46% | 0.79 | 6.16 | 27.27% | − 11,705 | 49.06% | 3030 | 30.93% | |
33.00 | NA | 161.03 | NA | NA | 2.70 | NA | − 10,995 | NA | 3567 | NA | |
30 < λ < 45 | 36.35 | 10.15% | 155.23 | 3.60% | 0.34 | 6.34 | 134.72% | − 10,890 | 0.96% | 2424 | 32.03% |
42.03 | 27.36% | 131.36 | 18.43% | 2.40 | 7.04 | 160.75% | − 4594 | 58.22% | 803 | 77.48% | |
46.32 | NA | 98.71 | NA | NA | 9.33 | NA | − 8371 | NA | 2960 | NA | |
45 < λ < 60 | 50.27 | 8.53% | 86.25 | 12.62% | 1.20 | 9.44 | 1.13% | − 5352 | 36.06% | 1699 | 42.58% |
57.58 | 24.31% | 54.89 | 44.39% | 1.83 | 18.28 | 95.92% | − 4184 | 50.02% | 1440 | 51.35% |