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Fourth powers, laws fatigues and some considerations about it

Rafael Álvarez Loranca
Consulting engineer


In the calculations made for the dimensioning of the new firm and for strengthening existing, some simplifications usual way which sometimes do not know what percentage affect the design solution we obtain are made.

In this article the so-called law of equivalence of the fourth power to pass the number of axles of a certain weight to another different weight is analyzed, the general characteristics of the fatigue laws we use are discussed and, finally, analyzes the called Miner Act and its application in some cases.

From all this it is intended that the technical know a little better the decisions you make and which, because of it, decided to dig a little deeper in the design and analysis firm.


Dimensioning, Analytical model, Fatigue law, Traffic load, Axle, Heavy Vehicle, Miner Law

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