Statically Indeterminate Structures and the Principle of Least Work. E-book. Formato PDF Harold Medway Martin   -  Forgotten Books, 2017  - 

Hence it is a case of stable equilibrium Whilst the others are unstable. It will be noted that the stable form is the least bent one, and as the work stored in a ?at spring increases with the amount of bending, it is obvious that the work stored up as potential energy is less in the stable than in the unstable conditions of equilibrium.