2. What is wood?
Wood is a porous and fibrous structural tissue
found in the stems and roots of trees, and
other woody plants.
It has been used for thousands of years for
both fuel and as a construction material. It is
an organic material, a natural composite of
cellulose fibers embedded in a matrix of lignin
which resists compression.
3. PHYSICAL PROPERTIES of wood:
-Anisotropy
-Moisture
-Dimensional stability
- Density
-Resistance to weathering
- Durability
- Action of other organisms
- Electrical properties
- Thermal properties
properties and characteristics
MECHANICAL PROPERTIES
-Elastic properties
- Strength properties
4. A
D
V
A
N
T
A
G
E
S
Thermal properties, which
give it an advantage in terms
of its resistance to high
temperatures.
Wood is resistant to electrical currents, making
it an optimal material for electrical insulation
Tensile strength, which is its ability to bend
under pressure without breaking. Tensile
strength is also one of the main reasons for
choosing timber as a building material; its
remarkably strong qualities make it the perfect
choice for heavy-duty building materials such
as structural beams.
Wood also contains highly-sought-after
acoustic properties.
5. D
is
a
d
v
a
n
g
e
s
Wood is very sensitive to the environment,
increasing or decreasing in size with variations
in humidity.
Vulnerability - is very vulnerable to external
agents, and their durability is limited.
Fuel
Dimensions - are limited: longish, reduced
cross section.
Wood, being a orthotropic material, not have
the same mechanical strength modules in all
directions.
6. Log construction, is employed when
only primitive cutting tools are
available. Four walls must be built up
together in horizontal layers of single
hewn or uncut logs and jointed at the
corners. The stability of the log building
depends entirely on the mutual
support of the walls, and the method is
suitable only for simple structures of
limited size.
LOG
skeletal
The skeletal system requires precise
cutting and shaping of lumber. It
provides a rigid framework of jointed
or nailed members independent of the
walls, which are attached to the
exterior and interior surfaces after
completion.
