UnitDeadLoad.htm What is unit dead load and how does it differ from unit weight?

DeadLiveLoad.htmIn summary, the unit dead load is the weight of a specific structural unit, while the unit weight is the weight per unit volume of a material. For example, the unit weight of structural concrete is 145lb/ft^3, so the unit dead load for 1 cubic foot of concrete would be 145 lbs. The term "unit dead load" may also refer to the overall dead load of a structure. It is important to consider the context and review the relevant section in a textbook for consistency.
  • #1
KV-1
16
1
What is the difference between the unit dead load and the unit weight of a material?

For example, the unit weight for structural concrete is 145lb/ft^3. What would the unit dead load be? 145lb?
 
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  • #2
KV-1 said:
What is the difference between the unit dead load and the unit weight of a material?

For example, the unit weight for structural concrete is 145lb/ft^3. What would the unit dead load be? 145lb?

It depends on how many cubic feet of concrete you have. If you have 1 cubic foot, the dead load is 145 lbs.; 2 cubic feet, 290 lbs.; etc., etc.
 
  • #3
The plain ordinary "dead load" is the unit weight times the volume.

I have seen the term "unit dead load" in specifications to refer to the same thing as the unit weight, or to the load of the specific structural unit (floor, house, office, bridge, whatever) under consideration. I've also seen it expressed in force-per-unit-area - so I'd say: check the context.
If your textbook uses the term, you should review the section that first talks about it to see what the text author is doing (and if they are being consistent).

i.e. http://www.bgstructuralengineering.com/BGASCE7/BGASCE7003/
 

1. What is the difference between unit dead load and unit weight?

Unit dead load refers to the weight of a structure or material that is permanently fixed in place, such as the weight of the building itself. Unit weight, on the other hand, refers to the weight of a material per unit volume, such as the weight of soil or water.

2. How are unit dead load and unit weight calculated?

Unit dead load is typically calculated by adding the weights of all permanent components of a structure, such as walls, floors, and roofs. Unit weight is calculated by dividing the weight of a material by its volume.

3. Why is it important to distinguish between unit dead load and unit weight?

It is important to distinguish between unit dead load and unit weight because they have different effects on the structural stability and design of a building. Unit dead load determines the overall weight of a structure and affects its foundation and support requirements, while unit weight affects the pressure and forces exerted on the building's structure.

4. How do unit dead load and unit weight affect building codes?

Building codes often have specific requirements for unit dead load and unit weight in order to ensure the safety and stability of structures. These codes may dictate the maximum allowable unit dead load for different types of buildings and the minimum requirements for unit weight of materials used in construction.

5. Can unit dead load and unit weight change over time?

Yes, unit dead load and unit weight can change over time. Unit dead load can increase or decrease if there are structural modifications or additions made to a building, while unit weight can change due to factors such as moisture content, settling, or compaction of materials.

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