- #1
denk209
- 2
- 0
- Homework Statement
- I need to find everything I can about the beam but I dont know how to do the bending moment.
- Relevant Equations
- Σ M=0
Do Axial Forces Affect Bending Moments in Beam Calculations?
- Context: Engineering
- Thread starter denk209
- Start date
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SUMMARY
Axial forces do not produce bending moments in beam calculations, as confirmed in the discussion regarding moment calculations around point C. The correct moment at point C is calculated using the formula Mc = - Fay*4 + 320*2, resulting in -622.44. It is essential to consider all forces and applied moments when summing moments about a point, not just those to the left. Additionally, the area under the shear diagram indicates the change in moment, and positive bending moments should be treated as clockwise according to engineering convention.
PREREQUISITES- Understanding of beam mechanics and bending moment calculations
- Familiarity with shear force diagrams
- Knowledge of engineering conventions for moment direction
- Basic skills in algebra for calculating reactions and moments
- Study the principles of beam deflection and bending moment theory
- Learn to construct shear and moment diagrams for various loading conditions
- Explore the effects of support reactions on beam calculations
- Investigate advanced topics in structural analysis, such as finite element methods
Structural engineers, civil engineering students, and professionals involved in beam design and analysis will benefit from this discussion.
- #2
denk209
- 2
- 0
I tried to get individual moments around point but let say for Mc I get = - Fay*4 + 320*2
so -622.44 for moment in point C
so -622.44 for moment in point C
- #3
- 7,201
- 527
Axial (normal) forces passing thru the point about which you are summing moments do not produce bending moments. It is confusing when you show these forces as pointing up and down on the beam.
In taking the moments about C , you need to consider all the forces and applied moments, not just the ones to the left of C.
It is best to draw the moment diagram first as best you can without too many values at first. Also, always treat positive bending moments as clockwise per engineering convention. Remember that the area under the shear diagram between 2 points represents the change in moment between those points. And The slope of the bending moment diagram tangent To the curve at a chosen point is the shear at that point.
Edit: o sorry I wasn’t thinking correctly your method for moment at C is correct. But your Answer is wrong because you need to correct your reactions at supports and watch your simple math.
In taking the moments about C , you need to consider all the forces and applied moments, not just the ones to the left of C.
It is best to draw the moment diagram first as best you can without too many values at first. Also, always treat positive bending moments as clockwise per engineering convention. Remember that the area under the shear diagram between 2 points represents the change in moment between those points. And The slope of the bending moment diagram tangent To the curve at a chosen point is the shear at that point.
Edit: o sorry I wasn’t thinking correctly your method for moment at C is correct. But your Answer is wrong because you need to correct your reactions at supports and watch your simple math.
Last edited:
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