BS EN 408:2003 pdf download.Timber structures ——Structural timber and glued laminated timber — Determination of some physical and mechanical properties.
Where the timber to be tested is not readily conditionable to the above standard environment (e.g. for hardwoods with high densities), that tact shall be reported.
For small specimens, unless otherwise protected, test pieces shall not be removed from the conditioning environment more than 1 h before testing.
NOTE Test pieces can be stored in the test area for up to 24 h provided they are close piled and wrapped in vapour tight sheeting.
9 Determination of local modulus of elasticity in bending
9.1 Test piece
The test piece shall have a minimum length of 19 times the depth of the section. Where this is not possible, the span of the beam shall be reported.
9.2 Procedure
The test piece shall be symmetrically loaded in bending at two points over a span of 18 times the depth as shown in Figure 1. If the test piece and equipment do not permit these conditions to be achieved exactly, the distance between the load points and the supports may be changed by an amount not greater than 1.5 times the piece depth, and the span and test piece length may be changed by an amount not greater than three times the piece depth, while maintaining the symmetry of the test.
The test piece shall be simply supported.
NOTE Small steel plates of length not greater than one-half of the depth of the test piece may be inserted between the piece and the loading heads or supports to minimize local indentation.
Lateral restraint shall be provided as necessary to prevent buckling. This restraint shall permit the piece to deflect without significant frictional resistance.
Load shall be applied at a constant rate. The rate of movement of the loading head shall be not greater than 0,003 h mm/s (see Figure 1).
For small specimens, unless otherwise protected, test pieces shall not be removed from the conditioning environment more than 1 h before testing.
NOTE Test pieces can be stored in the test area for up to 24 h provided they are close piled and wrapped in vapour tight sheeting.
9 Determination of local modulus of elasticity in bending
9.1 Test piece
The test piece shall have a minimum length of 19 times the depth of the section. Where this is not possible, the span of the beam shall be reported.
9.2 Procedure
The test piece shall be symmetrically loaded in bending at two points over a span of 18 times the depth as shown in Figure 1. If the test piece and equipment do not permit these conditions to be achieved exactly, the distance between the load points and the supports may be changed by an amount not greater than 1.5 times the piece depth, and the span and test piece length may be changed by an amount not greater than three times the piece depth, while maintaining the symmetry of the test.
The test piece shall be simply supported.
NOTE Small steel plates of length not greater than one-half of the depth of the test piece may be inserted between the piece and the loading heads or supports to minimize local indentation.
Lateral restraint shall be provided as necessary to prevent buckling. This restraint shall permit the piece to deflect without significant frictional resistance.
Load shall be applied at a constant rate. The rate of movement of the loading head shall be not greater than 0,003 h mm/s (see Figure 1).
