Determine the forces using virtual work(unit force method)

AI Thread Summary
The discussion focuses on using the principle of virtual work, specifically the unit force method, to determine forces in a multispan beam. Participants express difficulty in applying this method, particularly when analyzing the subsidiary portion of the beam. There is a consensus that while the principle of virtual work is commonly used, it may not be straightforward in this scenario. One user confirms that they can solve the problem using other methods but struggles with the virtual work approach. The conversation highlights the challenges of applying theoretical methods to practical problems in structural analysis.
daphnelee-mh
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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
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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?
 
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
 

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Thread 'Have I solved this structural engineering equation correctly?'

Thread 'Have I solved this structural engineering equation correctly?'

Hi all, I have a structural engineering book from 1979. I am trying to follow it as best as I can. I have come to a formula that calculates the rotations in radians at the rigid joint that requires an iterative procedure. This equation comes in the form of: $$ x_i = \frac {Q_ih_i + Q_{i+1}h_{i+1}}{4K} + \frac {C}{K}x_{i-1} + \frac {C}{K}x_{i+1} $$ Where: ## Q ## is the horizontal storey shear ## h ## is the storey height ## K = (6G_i + C_i + C_{i+1}) ## ## G = \frac {I_g}{h} ## ## C...
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