The comparison clearly reveals that bamboo is better in properties than that of Spruce and equal
or more than steel in tensile strength. More importantly the failure in bending of bamboo is not
actually totally failure. Due to its strong fibers, it first cracks unlike timber which breaks if bending
fails (Janssen, 2000). This quality of bamboo gives an opportunity to repair or replace failure
parts of house. The elasticity of bamboo is better than wood for seismic resistant housing and as
has been proved in the case of several small houses. One more advantage of bamboo over timber
is that it does not have rays. Rays are mechanically weak therefore bamboo material is better in
shear than timber material.
Ở trong đoạn này rays có nghĩa là gì ạ ?2)
The branches must be carefully removed so that the outer skin is not
damaged. It is important to cut bamboo just above the node at the base to prevent viruses of
entering the rhizomes' network. The height of the harvested poles can be estimated by
multiplying the base circumference measured in centimeters by 58,2 for species with diameters
greater than 5 cm. Bamboo canes have a circular cross-section and are slightly tapered inwards:
the diameter decreases gradually from the base to the top. Shorter canes taper more
dramatically than longer ones and therefore, longer canes are more appropriate for building
purposes. The cane should be at least three years old: after the first three years of growth,
bamboo starts to silicate slowly, and is at its optimal mechanical capacity.
trong đoạn này harvested poles có nghĩa là gì ?