Roof Live Load Example

Bleachers at a stadium are likely to see larger loads than what is seen on a.

Roof live load example.

Load types loads used in design load equations are given letters by type. 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. The live load on a roof is the weight of any temporary objects on the roof. Ponding water accumulates on roof faster than it runs off thus increasing the roof 18 runs off thus increasing the roof loads.

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 commentary in asce 7 05 c4 about roof live load reductions explains the anticipated difference in use of roof areas vs. The acceptable live load will vary considerably based on the occupancy and expected use of a structure or structural element. For example a storage room is much more likely to larger loads than is a residential bedroom.

2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. Used but they typically defined the load cases or combination stress or strength limits and deflection limits. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. The requirement is presented in asce 7 05 4 9.

How live load codes work. Rain snow ice wind and earthrain snow ice wind and earth quake loadings are examples of environmental loads. Typically roofs with slopes of 0 25 in ft or greater are not. Live loads l are a result of the occupancy of a structure.

Very slightly over time. Special examples of live loads. Minimum design live load can be found in asce 7 table 4 1 or ibc table 1607 1. 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.

Live loads roof live loads snow loads rain loads wind loads and earthquake loads are all examples of variable loads. 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.