The discussion focuses on analyzing the deflection of a square beam with screwed joints at both ends under a uniformly distributed load. It establishes that a screwed joint exhibits three force reactions and two moment reactions, contrasting with a fixed joint, which has three force and moment reactions. The conversation emphasizes that most joints are semi-rigid rather than purely fixed or simple, necessitating assumptions based on connection types and arrangements. The example of a steel I beam framed into a column using clip angles illustrates the complexity of real-world joint behavior.
PREREQUISITESCivil engineers, structural analysts, and students studying mechanics of materials who are involved in beam design and joint analysis will benefit from this discussion.
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.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
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.