Civil and Environmental Engineering 2221A/B Lecture 17: Lecture 17 Notes
8 Mar 2019
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So it just so happens that in this load case, the only horizontal deflection comes from the load that is in ac. The + sign means that the deflection is in the same direction of the virtual force. The minus sign means that the deflection is in the opposite direction of the virtual force. For the second case, you do the same thing. Calculate the axial forces due to the real loading case, and then created a simplified virtual loading case. Then do the table and summation and horizontal deflection. Note: if we were looking for vertical deflection we would use. And if we were looking for deflection at joint b we would use. So like, it"s good to remember that we can create any virtual load. Even though this frame is loaded at both a and b, our virtual load doesn"t have to.
