the determination of a factor of safety

kisqin2010

The determination of a factor of safetymust also take into account such matters as the following:

1. Probability of accidental over-loadingof the structure by loads that exceed the design loads;

2. Types of loads (static or dynamic);

3. Whether the loads are applied once orare repeated;

4. How accurately the loads are known;

5. Possibilities for fatigue failure;

6. Inaccuracies in construction;

7. Variability in the quality of workmanship;

8. Variations in properties of materials;

9. Deterioration due to corrosion or otherenvironmental effects;

10. Accuracy of the methods of analysis;

11. Whether failure is gradual (amplewarning) or sudden (no warning);

12. Consequences of failure (minor damageor major catastrophe);

13. And other such considerations.

Ifthe factor of safety is too low, the likelihood of failure will be high and thestructure will be unacceptable; if the factor is too large, the structure willbe wasteful of materials and perhaps unsuitable for its function (for instance,it may be too heavy).

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kisqin2010

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