Floor Live Load Reduction Example

And k ll is the live load reduction element factor.

Floor live load reduction example.

The probability of a 1 floor building is fully loaded is very high and hence no reduction for roof level slab supporting column or for 1 floor building. Floor live load reduction. Where l 0 is unreduced live load. 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.

Asce 7 05 10 ibc 2006 2009 2012 for live load not exceeding 100 psf not in passenger garages not in assembly uses with k ll x a t more than 400 square ft 2 live load can be reduced by the following equation. For uses other than storage where approved additional live load reductions shall be permitted where shown by the registered design professional that a rational approach has been used and that such. In fact it become less likely as the size of the area supported increases. Element k l l o 0 25 15 a i where l reduced live load l o code specified design live load a i influence area k ll a t k ll live load element factor see table table live load element factor k ll ll interior columns 4.

A t is tributary area. Cross sectional areas of the floor beams and girders are 14 7 in2 and 52 3 in2 respectively as shown on the next page figure. The probability of full live load on large areas in certain cases is unlikely. The requirement is presented in asce 7 05 4 9.

Loads should be determined in accordance with this chapter. Let us take a practical example and look at the logic. I 400 sq ft the live load may be reduced according to the live load reduction equation. There is another kind of live load reduction mentioned in is 1893 2016 in the mass source.

Example load distribution problem 7 the floor system of a library consists of a 6 in thick rein forced concrete slab resting on four floor steel beams which in turn are supported by two steel girders. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. The asce 7 05 uses concept of influence area as a major factor in computing the reduction that a member can use.