Determine the forces using virtual work(unit force method)

[daphnelee-mh]

Summary:: Require to determine the designated forces using principle of virtual work ( unit force method )

I have no idea how to determine the multispan beam using virtual work, if I start to analyse the subsidiary portion BC member, the Yc can be calculated and following by the Ma... it seems don’t involve the unit force method

 

[Dr.D]

I use the Principle of Virtual Work quite often, but I have to say that I do not see a simple way to employ it here. Is this a homework problem? If not, who cares what method is used?

 

[daphnelee-mh]

Yes, this is a homework problem, I know how to solve it if don't use virtual work method, but now I only can find the Yc