Screwed joint - free body diagram

AI Thread Summary
The discussion revolves around determining the deflection of a square beam with screwed joints at both ends under a uniformly distributed load. It highlights the complexity of screw joints, which have three force reactions and two moment reactions, contrasting them with fixed joints that have three of each. The conversation suggests that most joints are semi-rigid rather than simply supported or fixed, necessitating careful assumptions based on connection types. Additionally, it emphasizes the importance of considering connection details and the reliability of the joint when analyzing load support. Overall, the analysis of deflection requires a nuanced understanding of joint behavior and assumptions.
tihort
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Homework Statement



I have a square beam with a screwed joint at each end. I am trying to determine deflection under a uniformly distributed load.


Homework Equations



- What is a simplified form for the screwed joint? Is it to be assumed fixed at both ends?


The Attempt at a Solution



- The screw joint has 3 force reactions, and 2 moment reactions. A fixed joint has 3 forces and 3 moment reactions.
 
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tihort said:

Homework Statement



I have a square beam with a screwed joint at each end. I am trying to determine deflection under a uniformly distributed load.


Homework Equations



- What is a simplified form for the screwed joint? Is it to be assumed fixed at both ends?


The Attempt at a Solution



- The screw joint has 3 force reactions, and 2 moment reactions. A fixed joint has 3 forces and 3 moment reactions.

Homework Statement



Homework Equations





The Attempt at a Solution

In actuality, most joints are neither simple nor fixed, but somewhere in between (semi-rigid). Some assumptions may have to be made depending on the type connection and connection arrangement. A steel I beam, for example, is often framed into a column using clip angles welded or bolted to the webs, which are in turn bolted to the column with multiple bolts; for analysyis and deflection purposes, due to angle defornations, the beam is considered simply supported. Do you have a sketch of your connection detail? Would you trust the connection at one end to support a cantilevered load with no support at the other? If not, think simple.
 
PhanthomJay said:
In actuality, most joints are neither simple nor fixed, but somewhere in between (semi-rigid). Some assumptions may have to be made depending on the type connection and connection arrangement. A steel I beam, for example, is often framed into a column using clip angles welded or bolted to the webs, which are in turn bolted to the column with multiple bolts; for analysyis and deflection purposes, due to angle defornations, the beam is considered simply supported. Do you have a sketch of your connection detail? Would you trust the connection at one end to support a cantilevered load with no support at the other? If not, think simple.

Thank you very much PhantomJay!
 
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