Question: Using the Virtual Work method to determine the vertical deflection at joint B . I = 1 1 0 0 i n 4 , E

Using the Virtual Work method to determine the vertical deflection at joint B. I =1100in4,E=29,000ksi.
**Previous solution gave members as AB, BC, CD, DA, and DI. AB goes through I and C, BC good, CD good, DA goes through C and I, DI goes through C. How are these the members to analyze? Solution given may be correct, but this doesn't make sense.**
Using the Virtual Work method to determine the

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