Calculate Deflection at Point D with 245N Force Using Energy Method

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Discussion Overview

The discussion focuses on calculating the deflection at point D due to a 245N force using the energy method. Participants explore different approaches and considerations related to beam deflection, including the use of Free Body Diagrams (FBD) and Castigliano's method.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires whether the energy method can be used to calculate deflection at point D given the cross-sectional areas of the beams.
  • Another participant suggests using Castigliano's method, which relates to strain energy, to determine the deflection at point D.
  • A third participant asks for the depth of the horizontal member and mentions that axial deformation in the diagonal can likely be neglected, implying that this simplification could make the problem easier.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best approach to calculate the deflection, and multiple viewpoints regarding methods and assumptions remain present.

Contextual Notes

There are unresolved aspects regarding the depth of the horizontal member and the potential neglect of axial deformation, which may affect the calculations.

chungaaabb
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Hi to all.
ImageUploadedByPhysics Forums1368281534.847120.jpg

I need to calculate the deflection at D. At point D, there is a force of 245N acting on it. If I know the cross sectional areas of all beams, is it possible to use energy method to calculate the deflection?
 
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Probably the best thing to do is to take a FBD of the horizontal beam and use Castigliano's method (which is related to the strain energy) to get the deflection at the load P acting at point D.
 
thx guys
 

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