Estimation of Gravity Loads Flashcards
The term dead load refers to….
the load produced by all the relatively permanent structural and non-structural components. They are essentially fixed gravity loads.
According to the NBCC, what are some of the items that can be classified as a dead load?
- The weight of structural members
- The weight of all materials of construction incorporated into the building to be supported permanently (flooring, ductwork, fixtures, wiring, doors, windows, etc)
- The weight of partitions
- The weight of permanent equipment
- The weight of earth, plants, trees
True or False; The dimensions of structural members are not known until after they have been designed.
True
In addition to the permanent partitions know to exist at the time of construction, an allowance must be made for the …
The addition or rearrangement of partitions at some future date. (The allowance must be greater that 1.0 kPa or 20 psf for any floor area where partitioning is possible). This allowance should be only applied where it increases the load effect (ie. not in patterned loading).
Equipment weight should be treated as…
a live load, because of the variation among suppliers, and the potential of replacements or upgrades .
Live loads due to use and occupancy for a given area are determined by the…..
function of that area. (ie humans, machines, and movable objects in the area)
How do live loads differ from dead loads?
Live loads differ in magnitude and location
What are some common sources of live loads?
An assembly of people, Furniture, movable equipment(including overhead cranes), stored materials.
Live loads are generally considered to act as…
uniformly distributed loads
Many values in the NBCC are considered …. and…
minimum values and in some cases more severe loads should be considered.
Due to the nature of live loads, it is possible for them to act over only a portion of a structural member, because of this what should an engineer do?
An engineer should account that this partial loading may result in a more severe effect on a structural member. Various patterns of live loads should be considered(ie the load considered should produce the most critical effect.
