feedingjax said:
I am calculating the all reaction forces in this beam.
However, I want to ask:
By taking moment about point B, why does the moment of the UDL become 15*7*5.5 instead of 15*7*4.5
Thanks !
The reaction force at point B in a beam can be calculated by taking the sum of moments about point B and setting it equal to zero. This method is known as the moment equilibrium equation and it takes into account the weight and any applied forces or moments acting on the beam.
A moment is a rotational force while a force is a linear force. In beam calculations, moments are measured in units of newton-meters (Nm) while forces are measured in units of newtons (N). Moments can cause a beam to bend or rotate while forces can cause a beam to move or deform.
No, the reaction force at point B cannot be negative. This is because the reaction force is a result of the beam being supported at point B, which means it is pushing or pulling in the opposite direction of an applied force or moment. If the reaction force were negative, it would mean that the beam is pushing or pulling in the same direction as the applied force or moment, which is not possible.
Calculating the reaction force at point B is important in beam analysis because it helps determine the stability and structural integrity of the beam. By knowing the reaction force, we can ensure that the beam can support the applied loads and moments without breaking or failing. It also allows for the proper design and placement of supports and connections for the beam.
Yes, there are some assumptions made when calculating reaction forces in a beam. One assumption is that the beam is in static equilibrium, meaning that the sum of forces and moments acting on the beam is equal to zero. Another assumption is that the beam is rigid and does not deform under the applied loads. Additionally, the beam is assumed to be homogeneous and the supports at point B are assumed to be fixed and not able to move or rotate.