Question: Rigid bars A B and B C are pin connected at B . If the spring at D has a stiffness k , determine the

Rigid bars AB and BC are pin connected at B. If the spring at D has a stiffness k, determine the critical load Pcr that can be applied to the bars. Hint: Remember Pcr corresponds to neutral equilibrium. If the bar AB rotates by an angle at A at the critical load, then the system will be in equilibrium under no external load in that configuration, shown in the next figure. Use this configuration to calculate Pcr.(30 points)
Rigid bars A B and B C are pin connected at B .

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