Calculating Support Reaction Forces using Method of Joints

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The discussion focuses on calculating support reaction forces using the method of joints and highlights confusion regarding equilibrium equations. It is noted that applying these equations may lead to a cancellation of forces, resulting in a zero reaction force. Participants question whether summing moments at a specific point can provide an additional equation for solving the problem. There is uncertainty about whether the support reaction forces should equal the total weight of the structure plus any applied loads. Overall, the conversation emphasizes the complexities involved in analyzing statically indeterminate structures.
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Summary:: The question requires us to determine the member forces using method of joints but I couldn’t figure out how to calculate the support reaction forces

I tried to use equilibrium equations to solve the question but the force applied will be canceled out, and eventually the reaction force will be zero
 

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Summary:: The question requires us to determine the axial forces using method of sections but it is statically indetermine structure

Can I make up one more equation by summing the moment at point O ?
 

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Will the support reaction forces G and H not sum to the weight of the structure, plus the load ?
 
Baluncore said:
Will the support reaction forces G and H not sum to the weight of the structure, plus the load ?
Sorry I don’t understand
 
Thread 'Why wasn’t gravity included in the potential energy for this problem?'

Thread 'Why wasn’t gravity included in the potential energy for this problem?'

I’m looking at the attached vibration problem. The solution in the manual includes the spring potential energy but does NOT include the gravitational potential energy of the hanging mass. Can someone explain why gravitational potential energy is not included when deriving the equation of motion? I tried asking ChatGPT but kept going in circles and couldn't figure out. Thanks!
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