The Roof Deck Of The Single Story Building Is Subjected To A Dead Plus Live Load

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.

The roof deck of the single story building is subjected to a dead plus live load.

R 1 1 for a t less than or equal to 200 psf r 1 1 2 0 001 a t for between 200 psf and 600 psf. Used but they typically defined the load cases or combination stress or strength limits and deflection limits. The load combinations in table 3 1 are recommended for use with design specifications based on allowable stress design asd and load and resistance factor design lrfd. Roof live load may be reduced by the following equation.

1987 deals with snow loads on roofs of the building. Live loads are a variable component like people furniture bbq grills and flower pots. Load types loads used in design load equations are given letters by type. People furniture and any other movable physical objects on the deck are covered under live load.

In commercial buildings the minimum live load required by the international building code is determined by the anticipated use of each space and thus the. Where d is floor dead load. L r l o r 1 r 2. In the world of home building and deck building loads are broken down into categories.

Where l r shall not be less than 12 psf and not more than 20 psf. Dead load is the weight of the parts that make up the structure. The minimum snow load on a roof area or any other area above ground which is subjected to snow accumulation is obtained by the expression. The area of the occupied roofs shall not be included in the building area as regulated by section 506.

Load combinations provide the basic set of building load conditions that should be considered by the designer. The live load is the external force applied to a deck due to the activities of its use. If the purlins are spaced 4 ft and the bents are spaced 25 ft apart. 503 1 4 occupied roofs a roof level or portion thereof shall be permitted to be used as an occupied roof provided the occupancy of the roof is an occupancy that is permitted by table 504 4 for the story immediately below the roof.

The dead load on a roof is the weight of the roof structure itself along with any permanently attached materials or structures on the roof so it must be designed first of all to support itself. Roof live load reduction.