Load Distribution and Shear/Bending Diagrams

[MTGIRONES]

Hi everyone, how do I calculate the load on each support when the point load on a beam is not in the center? Also, what’s the difference between shear force and bending moment? I’m still confused by the diagrams. Thanks

 

[ANE91]

Statics! The load could be anywhere, and you would still be able to solve for the reactions. I’m assuming this is a statically determinate beam that is simply supported. Post a sketch, and maybe also move this to the student forum.

Write out your the relevant equations of equilibrium: sum of vertical forces and sum of moments about a point. You should be able to solve for the two unknown reactions using these two independent equations, by algebraic principles.

Shear is the derivative of moment. They are both load effects. Shearing forces are those that cause adjacent sections of the beam to slide against each other, and bending moments flex the beam such that the bottom is pulled apart and the top is compressed.

 

[JAE]

This is basic engineering 101 in college. Ask your professor as this would be your best path.

 

[Ron247]

First, I agree, move this to the "Student Engineer General Discussion".

I do not know how far you are into engineering, but Statics is generally a 1st semester class. Statics is where your answer will be found. If you have had Statics but cannot solve this item, your concept of how to learn engineering may be flawed. Students tend to use 1 of 2 concepts in their approach to learning engineering. The 1st one is, give me a 1,000 worked examples to learn so I can learn how to solve each of those problems. This one never works, because there will be problem 1,001 eventually and on it, you will be lost. The 2nd one is to learn the concepts, rules, terminology and behavior of the items under study. Believe it or not, this takes much less time, less memorization, can be mentally retained longer and won't leave you clueless on problem 1,001. It also prepares you for the next class that relies on this one for success in it.

Since you are also inquiring about shear and moment, I assume you have moved from Statics to Strength of Materials. Have you completed Statics? If so, you will struggle unless you back up and get a stronger "feeling" for statics.

 

[Ron247]

Now I have become REALLY curious about this post. MTGIRONES cannot solve a simple span beam statics problem, but at the same time is commenting on "Becoming a Better Structural Engineer" post as if they are experienced in SE. Their response is below:

" totally understand. The key is to find resources that fit your pace and needs. I'd recommend exploring courses on platforms like Coursera or LinkedIn Learning, which offer specialized content in structural engineering. Also, finding a mentor in your network or through professional forums like SEAOI can provide more personalized guidance. The goal is to integrate continuous learning into your daily routine efficiently. Keep up the great work"

Are 2 different people using this credential? If so, MTGIRONES#1, please help MTGIRONES#2.

 

[rb1957]

maybe he's in management ? or project mgmt and has "lost" his technical skills ?

 

[Ron247]

maybe he's in management ? or project mgmt and has "lost" his technical skills ?

Yes, that sum of the forces in the Y is hard to remember unless you use it daily. After countless hours of formula memorization in Statics of Sum-Y, Sym-X, Mom-Z = 0, they throw in 3D and I have to add Sum-Z, Mom-X and Mom-Y. 6 wholes formulas. I still wonder how I got through it. And don't get me started on the Right Hand Rule that was inherently unfair to "Lefties".