3 Pinned Frame - Produce Calcs, BMD & SFD

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SUMMARY

The discussion focuses on the calculation and production of Shear Force Diagrams (SFD) and Bending Moment Diagrams (BMD) for a pinned frame structure. The user has completed the diagrams but suspects inaccuracies due to potential confusion between positive and negative values. Key corrections include ensuring the pin at joint C is represented, multiplying wind pressure by the frame spacing of 4.8 m for horizontal frame load in kN/m, and adjusting the moment arm for a 10.6 N load to 16 m instead of 8 m. Additionally, it is crucial to indicate a moment at the upper corner joints rather than assuming it to be zero.

PREREQUISITES
  • Understanding of structural analysis concepts, specifically Shear Force and Bending Moment Diagrams.
  • Familiarity with the principles of pinned frame structures and their load distribution.
  • Knowledge of wind load calculations and their application in structural engineering.
  • Proficiency in interpreting and correcting engineering diagrams based on established conventions.
NEXT STEPS
  • Review the principles of Shear Force and Bending Moment Diagram construction.
  • Study the effects of wind load on structural frames, focusing on load distribution techniques.
  • Learn about the significance of moment arms in calculating forces in structural elements.
  • Explore best practices for accurately representing joints and connections in engineering diagrams.
USEFUL FOR

Civil engineers, structural analysts, and students involved in the design and analysis of framed structures will benefit from this discussion, particularly those focused on producing accurate Shear Force and Bending Moment Diagrams.

Phil52
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I have to provide calcs and then produce Shear Force Diagrams, Bending Moment Diagrams.
I,ve completed it but I think I,m going wrong somewhere. The diagrams do not look correct. I suspect I,ve possibly got positive/negative values mixed up somewhere through it but I,m not totally sure. Any advice would be greatly appreciated.

See attachment for the question & my workings.
 

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Phil52 said:
I have to provide calcs and then produce Shear Force Diagrams, Bending Moment Diagrams.
I,ve completed it but I think I,m going wrong somewhere. The diagrams do not look correct. I suspect I,ve possibly got positive/negative values mixed up somewhere through it but I,m not totally sure. Any advice would be greatly appreciated.

See attachment for the question & my workings.
your initial diagram does not show the pin at C.
The frames are spaced 4.8 m apart , so the wind pressure must be multiplied by the frame spacing to get the horizontal frame load in units of kN/m.
Otherwise your approach looks good, but you had an incorrect moment arm for that 10.6 N load ...should be 16 m not 8 m.
When you draw shear and moment diagrams, there must be a moment at the upper corner joints, not 0 as you have shown. The horiz and vert members are rigidly connected at those joints.
 

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