Fixed end moments with a beam with udl

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SUMMARY

The discussion centers on calculating the end moments for a fixed-end beam subjected to a uniformly distributed load (UDL). The correct end moments are determined to be WL²/12, contrary to the initial assumption of WL²/4. This conclusion is based on the mechanics of fixed-end beams, where both slope and deflection at the ends are zero. The reference to Schaum's Outline of Strength of Materials provides a foundational technique for solving such problems involving UDLs across the full length of the beam.

PREREQUISITES
  • Understanding of fixed-end beam mechanics
  • Knowledge of uniformly distributed loads (UDL)
  • Familiarity with moment calculations in structural engineering
  • Basic concepts from Schaum's Outline of Strength of Materials
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  • Study the derivation of end moments for fixed-end beams under UDL
  • Learn about the influence of different loading conditions on beam deflection
  • Explore advanced topics in structural analysis using software like SAP2000
  • Review examples of beam loading scenarios in Schaum's Outline of Strength of Materials
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Structural engineers, civil engineering students, and professionals involved in beam design and analysis will benefit from this discussion.

date.chinmay
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I came across a reference where there is a beam (lets say length L)
both ends fixed... with a UDL of say "W" per unit length... i want to know how the end moments are W L^2/12 ...shudnt they be W L^2/4??


Its pretty simple mechanics. but it got me wondering,,,,
 
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In the fixed end beam, both the slope and deflection at the ends must equal zero. In a simply supported beam, there are different end conditions and the moments are typically zero, unless there is also an applied couple.
 
nice,,,
i wondered if u cud provide a solution or a link to the actual stepwise solving of one...
 
Here is an excerpt from a Schaum's Outline of Strength of Materials (prob. 11.6):

This problem shows a beam which is partially loaded with a UDL. The technique can be used when the UDL is extended the full length of the beam.
 

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