Roof Live Load Example

The nature of roof live load is different from that of floor live load so the approach to reducing roof live load is different from that used for floor live load.

Roof live load example.

Roof and floor live loads are produced during maintenance by workers equipment and materials and during the life of the structure by movable objects such as planters and people. Bleachers at a stadium are likely to see larger loads than what is seen on a. Live loads roof live loads snow loads rain loads wind loads and earthquake loads are all examples of variable loads. Used but they typically defined the load cases or combination stress or strength limits and deflection limits.

Live loads l are a result of the occupancy of a structure. Typically roofs with slopes of 0 25 in ft or greater are not. Very slightly over time. Minimum design live load can be found in asce 7 table 4 1 or ibc table 1607 1.

For example the live load for a room in a single family residence will be significantly smaller than the live load for an area of equal size at a movie theatre or sporting event. The live load on a roof is the weight of any temporary objects on the roof. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load.

Special examples of live loads. The commentary in asce 7 05 c4 about roof live load reductions explains the anticipated difference in use of roof areas vs. Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the. Load types loads used in design load equations are given letters by type.

These loads are not considered to be per manent because of their inherent degree of variability with respect to time see the definition of loads in ibc 202. For example a storage room is much more likely to larger loads than is a residential bedroom. Rain snow ice wind and earthrain snow ice wind and earth quake loadings are examples of environmental loads. How live load codes work.

The acceptable live load will vary considerably based on the occupancy and expected use of a structure or structural element. The requirement is presented in asce 7 05 4 9.