Does timber always behave as a linear elastic material? What do you believe is a maximum...

Does timber always behave as a linear elastic material? What do you believe is a maximum safe working bending stress for F17 hardwood and MGP10 machine graded pine and why?
If you require higher load carrying capacity in timber what are your options?
get idea from 3point timber testing (250) words

Expert Solution

-Wood is highly non-linear material. The properties of it varies widely from each species and within the species and also varies based on its age.

-Wood is strong in compression and tension and weak in flexure due to its peculiar fibrous structure.

- In F grading system F stands for force in megapascal , and givesgthe maximum bending stress the wood can take safely. So,Bending strength of F17 hard wood is 17MPa.

-MGP stands for machine graded pines and is used for grading certain species of pines. Unlike F grading system MGP value is an indicative of modulus of elasticity and not the bending stress. MGP 10 have flexural strength equivalent to F5. So the maximum bending stress it can bear safely is 5 MPa. (This may varry a little bit as wood showing same modulus of elasticity may have different bending strenght).

-For increased load carrying capacity:

1. Loading should be perpendicular to the grain orientation.

2. Corrugation of timber structures increases stiffness an hence increase load carrying capacity.

3. Use of flitched beams in with steel is used along with wood.

4. Using well seasoned wood.

5. Increse in depth of timber beams have great positive impact on its load carrying capacity (than corresponding increase in depth in rcc beams)

Ally Wells answered 2 years ago

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