竹结构的抗弯强度和无损检测
摘 要
优化竹子的使用需要对竹子的物理、机械和化学性质有全面的了解。使用竹子作为建筑材料时，需要了解其特定的重力、刚度和弯曲强度特性。本文研究了四年生“Vittata”竹的密度、刚度、抗弯强度和无损评价，该竹在亚马逊生态和可持续村庄建设中非常常见。弯曲强度的样品是从八根杆上切下的三个3米的节段（基部，中部和顶部）。首先，通过应力波计时器（SWT）的轴向声波振动无损地测试3-m长杆，然后在2.71点加载静态弯曲，测试的竹杆的平均含水率和密度分别为12.95%和646公斤m3。平均动态弹性模量为17.3gpa。平均极限荷载、断裂模量和弹性模量分别为7.9kn、88mpa和9.6gpa。分析结果表明，竹材密度和动态弹性模量可以用来确定其强度和刚度。此外，SWT还可用于竹材强度和刚度的无损评价。
关键词: 竹材弯曲强度；密度；虎尾竹；亚马逊；竹子无损评价
Bending strength and nondestructive evaluation of structural bamboo
ABSTRACT
Optimization on the use of bamboo requires comprehensive understandings of the physical, mechanical,and chemical properties. When using bamboo as a building material, one needs to know its specific grav-ity, stiffness and bending strength properties. This work investigated density, stiffness, bending strengthproperties and nondestructive evaluation of four-year oldBambusa vulgarisrsquo;Vittatarsquo;, very common inManaus, used on the construction of an ecological and sustainable village for Amazonia. Flexural bendingstrength samples were cut from eight culms in three 3-m segments (base, middle, and top). The 3-m longculms were first tested nondestructively through axial sonic vibration of a Stress Wave Timer (SWT), thenin thirdpoint loading static bending with a clear span of 2.71 m. The average moisture content and den-sity of the bamboo culms tested were 12.95% and 646 kg m3, respectively. The average dynamic modu-lus of elasticity was 17.3 GPa. The average ultimate load, modulus of rupture and modulus of elasticitywere 7.9 kN, 88 MPa and 9.6 GPa, respectively. Analysis of the results showed that bamboo culm densityand dynamic modulus of elasticity can be used to determine its strength and stiffness. Also, SWT can beused for nondestructive evaluation of bamboo culms strength and stiffness.
Key words: Bamboo bending strength；Density；Bambusa vulgaris rsquo;Vittatarsquo;；Amazonia；Bamboo nondestructive evaluation
目 录
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