Point load Vs Distributed loads

In summary, the distinction between a point load and a distributed load depends on the region the load contacts in comparison to the total size of the beam or plate. For smaller loads, a point load may be used for quicker and conservative analysis, while for larger loads, a distributed load is justified for accurate analysis.
  • #1
koolraj09
167
5
Hi all.
Do we have a boundary (for classification) as to when a load can be called a point load or a distributed load?
Thanks.
 
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  • #2
For practical purposes, I look at the region the load contacts compared to the total size of the beam or plate.

For example, suppose you have a 30 foot long I-Beam with a lifting lug that is 1 foot long. I would model the lifting lug as a point load since it is quicker to analyze and conservative and the difference in the result is not very much.

On the other hand, suppose you have a 20,000 lb liquid filled vessel with its saddles sitting on beams. In this case, a distributed load is justified for analyzing the supporting beams.
 

1. What is the difference between point load and distributed load?

Point load is a concentrated force acting at a single point on a structure, while distributed load is a force that is spread out over a larger area.

2. Which type of load is more common in real-life structures?

Distributed load is more common in real-life structures because it more accurately represents the weight and forces that a structure is designed to withstand.

3. How do point load and distributed load affect the stability of a structure?

Point load can cause localized stress and potential failure at the point of application, while distributed load can cause more uniform stress throughout the structure. In general, distributed load is more desirable for structural stability.

4. Can point load and distributed load be present in the same structure?

Yes, a structure can experience both point load and distributed load at the same time. For example, a building may have point loads from columns and beams, as well as distributed loads from the weight of its own materials and occupants.

5. How do engineers account for point load and distributed load in structural design?

Engineers use mathematical equations and models to determine the effects of point load and distributed load on a structure. They also consider factors such as material strength, weight distribution, and safety margins to ensure the structure can withstand these forces.

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