Find the support reactions on a beam

In summary, the conversation discusses a problem with calculating support reactions for a beam, as the results obtained are different from the teacher's and online software's results. The issue is believed to be caused by an incorrect input value in the online calculator, specifically the moment which should be 150 N-m instead of 150 N x 1.5 m. Further clarification is given on the correct value and its effect on the beam and lever's static equilibrium.
  • #1
Noob of the Maths
52
6
Homework Statement
Find the support reactions on beam.
Relevant Equations
Sum of moments
Hello! in this good afternoon ;).

I need some help for this beam and his support reactions.

The problem it is done, but my result its different from the teacher`s result.

I'm sure my answer is correct, as even the "SkyCivbeam" online software also gives the same results.

it appears that the problem lies in the momentum that accompanies the 150 N force...but i don't know..
Captura de Pantalla 2021-09-21 a la(s) 20.46.47.png


Thanks for read!
 
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  • #2
The concentrated moment should be not 150, but 150 N x 1.5 m.
 
  • #3
Lnewqban said:
The concentrated moment should be not 150, but 150 N x 1.5 m.
Nope. Note that the moment is given as 150Nm (the yellow is kind of hard to read). Multiplying it by a length again will mess up your units.
 
  • #4
willem2 said:
Nope. Note that the moment is given as 150Nm (the yellow is kind of hard to read). Multiplying it by a length again will mess up your units.
Please, note that the yellow color shows the incorrect input value into the online calculator.
If the reaction moment at the point of connection between the beam and the L-shape lever is 150 N-m, that lever can't remain in static equilibrium respect to the beam.
Please see original problem shown by hand drawn diagram on top left corner of OP.
 

1. What is a beam and why is it important to find the support reactions?

A beam is a structural element that is used to support loads and transfer them to the supports. It is important to find the support reactions on a beam in order to ensure that the beam is able to withstand the applied loads and remain stable.

2. How do you calculate the support reactions on a beam?

The support reactions on a beam can be calculated using the equations of static equilibrium. These equations state that the sum of all forces acting on a stationary object must be equal to zero, and the sum of all moments must also be equal to zero. By applying these equations to the beam and solving for the unknown support reactions, the values can be determined.

3. What are the different types of support reactions?

The different types of support reactions on a beam are: roller support, pin support, fixed support, and cantilever support. A roller support allows the beam to move horizontally, a pin support allows the beam to rotate, a fixed support prevents both horizontal and vertical movement, and a cantilever support is fixed at one end and free to move at the other end.

4. What factors can affect the support reactions on a beam?

The support reactions on a beam can be affected by various factors such as the type of load applied, the length and shape of the beam, the material properties of the beam, and the type of support used. Other factors such as temperature changes and external forces can also impact the support reactions.

5. Can the support reactions on a beam be negative?

Yes, the support reactions on a beam can be negative. This occurs when the direction of the reaction force is opposite to the direction of the applied load. Negative support reactions can also occur when the beam is not in equilibrium, for example, when the applied loads are greater than the beam's capacity.

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