# Calculating the loads at different points on a base frame

• Peirianeg
In summary, the conversation discusses the calculation of loads at each point of a frame that will support a large fan with a weight of 6,060 kg. It is mentioned that the fan contacts all 8 points shown on the frame and it is asked if all members of the frame have the same cross section. The axis of rotation of the fan and any potential changes in fan reactions are also mentioned. Peirianeg provides a solution using rigid-body mechanics, assuming a relatively stiff frame and using g = 9.81 m/s^2, and calculates the vertical reaction force (Rz) at each support point. The cross-sectional dimensions of the frame members are also mentioned and it is noted that incorporating them would make the problem more
Peirianeg
The attachment provided shows a frame in which a large fan is to be rested on. The fan has a weight of 6,060 kg and the location of the centre of gravity is shown in the attachment. I would like to know how to calculate the loads at each point. Could anyone please provide some help on this problem?

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I assume that the fan contacts all 8 points shown on the frame.

Do all the members of the frame have the same cross section, i.e., does the frame use the same structural shapes for all members?

What is the axis of rotation of the fan? Are you concerned about any change in fan reactions for the static condition versus when the fan is operating?

Peirianeg: Assuming the frame is relatively very stiff (rigid-body mechanics), and using g = 9.81 m/s^2, then the vertical reaction force (Rz) at each support point would be as follows.

Code:
Point   Rz

1    7504 N
2    7634
3    7731
4    7279
5    7409
6    7506
7    7171
8    7214

If you do not want a rigid-body mechanics solution, then you would need to incorporate the cross-sectional dimensions of the frame members, in which case the problem would become more difficult.

Last edited:
Many thanks nvn, I was wondering if you could possibly show your calculation methods if that's okay. And it would be considered as a rigid-body.

Peirianeg: I made a mistake in post 3, which is now corrected, below.

Assuming the frame is relatively very stiff (rigid-body mechanics), and using g = 9.81 m/s^2, then the vertical reaction force (Rz) at each support point would be as follows.

Code:
Point   Rz

1    7436 N
2    7685
3    7869
4    7150
5    7399
6    7583
7    7122
8    7205

If you do not want a rigid-body mechanics solution, then you would need to incorporate the cross-sectional dimensions of the frame members, in which case the problem would become more difficult.

1 person
Thanks for the update, would it be okay if you could show how you calculated the load at each point please? All members have the same cross-sectional dimensions which are 200h x 90w.

## 1. How do you calculate the loads at different points on a base frame?

To calculate the loads at different points on a base frame, you must first determine the weight of each component that will be placed on the frame. Then, you will need to analyze the forces acting on the frame, such as gravity and external forces. Once you have this information, you can use equations and formulas to calculate the loads at each point on the frame.

## 2. What factors affect the calculation of loads on a base frame?

The factors that affect the calculation of loads on a base frame include the weight and distribution of the components on the frame, the type of forces acting on the frame, and the strength and stability of the frame itself. Other factors that may influence the calculation include environmental conditions, such as wind or seismic activity.

## 3. What is the purpose of calculating loads at different points on a base frame?

Calculating the loads at different points on a base frame is important for ensuring the structural integrity and safety of the frame. By accurately determining the loads, engineers can design a frame that can support the weight and forces placed upon it without experiencing failure or collapse.

## 4. How do you ensure the accuracy of load calculations on a base frame?

To ensure the accuracy of load calculations on a base frame, it is important to use precise measurements and data when determining the weight and forces acting on the frame. Additionally, engineers may use computer-aided design (CAD) software or perform physical tests on a prototype to verify the calculations.

## 5. Can load calculations on a base frame change over time?

Yes, load calculations on a base frame can change over time. This can happen due to changes in the weight or distribution of components on the frame, changes in environmental conditions, or wear and tear on the frame itself. It is important to regularly review and update load calculations to ensure the continued safety and stability of the frame.

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