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Re: Virtual Work

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On Dec 20, 2004, at 7:48 PM, Nico Laban wrote:

Can somebody tell me about what virtual work is? what is the concept of it? how do we use it? what is the advantage? what is the relation with virtual force and virtual displacement?.
It's a way of describing strength of materials on the basis of a balance of the energy applied to the structure by external loads and the strain energy of the structure. There are also approaches to indeterminate structures based on this energy balance. Your best bet is to pick up a sophomore strength of materials book and read the chapter on virtual work. Den Hartog's Strength of Materials is a good reference, adn you can get it cheap from Dover Books.
Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)    | this distance" (last words of Gen.
...................................| John Sedgwick, Spotsylvania 1864)

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