MecMovies 4.0 : M5.7: Rigid Bar and Two Axial Members

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The figure shows a rigid bar A B C D pinned at A and supported at B and C by vertical rods labeled 1 and 2 respectively. The separation between A and B is 380 millimeters. The separation between B and C is 380 millimeters and the separation between C and D is 760 millimeters. The load at D is P which equals 36 kilo newtons directed vertically downwards and this load inclines the bar downwards at D. The deflection at B is v subscript B which equals delta subscript 1 and the deflection at C is v subscript C which equals delta subscript 2.

Because each bar is connected to rigid bar $AD$ , the deformations in bars $(1)$ and $(2)$ are not independent. In fact, the geometry of the deflected structure can be used to establish the relationship between the deformation in bar $(1)$ and the deformation in bar $(2)$ . This geometric relationship provides the information that is needed to solve the problem.