Designing a Stable Crane: Finding Reactions & Max Load

AI Thread Summary
The discussion focuses on designing a stable crane by calculating the reactions at the jib and determining the maximum load it can lift. The key steps involve finding the reactions at the junction of the horizontal and vertical beams, ensuring that the sum of all forces equals zero. The user estimates a maximum weight capacity of 600 kg based on their pulley system but is uncertain if the crane can safely lift this load. They also seek to calculate the moment at the base of the vertical beam to ensure stability. The calculations suggest that the reaction force at the beam junction would be 6000N, indicating a need for further verification of the crane's design.
dreistein
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Homework Statement


I'm to design a crane, and therefore I need to find the reactions in the jib and also make the crane stable.
1. I need to find the max. load that the crane is able to lift. Therefore i have to find the reactions where the horisontal and vertical boom is meeting.
2. I need to find out the moment in the bottom of the vertical beam in order to make the crane stable. Now i should have the max weight, and therefore the weight of the stone. And it should be easier to calculate


Homework Equations





The Attempt at a Solution


The sum of all the forces needs to be 0. F=0
The angle is 90 degrees, so that is not going to be a problem
The wire from the horisontal beam is only ½ m.
But since i don't know the weight of the stone, I don't know where to begin?
 

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as I'm using a pulley system i found out that my weight max is going to be 600 kg, but is my crane able to do this? What will the reactions be where they meet each other? And will they be able to lift this?
 
I assume that the reaction would be: moment = 0, 6000N*3m-R*3m=0
Therefore Reaction where the beams are meeting would be 6000N
 

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