Shear and moment diagrams: help with moment diagram

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SUMMARY

The discussion focuses on the challenges faced in constructing moment diagrams in structural analysis, specifically regarding a problem involving shear and moment calculations. The user successfully created a shear diagram but encountered discrepancies in the moment diagram, particularly after integrating the shear curve. The correct reactions at supports A and B were identified as 23.333 kN and 18.667 kN, respectively, highlighting the importance of accurate calculations in structural engineering.

PREREQUISITES
  • Understanding of shear and moment diagrams in structural analysis
  • Proficiency in integration techniques for calculating areas under curves
  • Familiarity with static equilibrium and reaction forces
  • Knowledge of kN as a unit of force in engineering contexts
NEXT STEPS
  • Review the principles of constructing shear and moment diagrams
  • Practice integration techniques for determining areas under curves
  • Study static equilibrium and its application in structural analysis
  • Explore common mistakes in calculating support reactions in beam problems
USEFUL FOR

Students and professionals in civil engineering, particularly those focusing on structural analysis and design, will benefit from this discussion. It is also valuable for anyone looking to improve their skills in calculating shear and moment diagrams.

musicmar
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Homework Statement


This would be really difficult to type, so I've attached the given problem and my work. I think it is legible for the most part, but let me know if you have problems reading something.

The Attempt at a Solution


My shear diagram worked nicely. I've run into a problem with the moment diagram. After I integrated the diagonal line function to get the area under the shear curve, I should have to add 24 kN to get back to 0, but from my previous work, I was at -36.

Any help in finding my mistake would be appreciated.

Thank you!
 

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your reactions at A and B are miscalculated I get 23.333 at A and 18.667 at B
 

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