Reinforced Concrete Roof Slab Thickness

The maximum diameter of bar used in slab should not exceed 1 8 of the total thickness of slab.

Reinforced concrete roof slab thickness.

Methods used for finding slab thickness varies for different types of slabs. For determining moments shears and reactions of such slabs. Reinforced concrete slabs are heavier and generate higher seismic forces in an event. Plan view of a reinforced concrete pitched inclined slab.

Slab reinforcement cantilever reinforcement slab thickness roof apex reinforcement example of a 1. Such slabs left unconnected to walls caused many deaths in the 2005 quake from school roof collapses. Exact specifications vary but most concrete roofs are several inches thick. A concrete slab is a common structural element of modern buildings consisting of a flat horizontal surface made of cast concrete.

If reinforced concrete were to be reused strong connections would have to be made between roof and walls. According to the 1995 aci code all two way reinforced concrete slab systems including edge supported slabs flat slabs and flat plates are to be analyzed and designed according to one unified method such as direct design method and equivalent frame method. Minimum reinforcement is 0 12 for hysd bars and 0 15 for mild steel bars. In general 6 inch 150mm slab thickness is considered for residential and commercial buildings with reinforcement details as per design.

Thickness of concrete slab depends on loads and size of the slab. 6 mm 8 mm 10 mm 12mm and 16mm. Thickness of the slab is decided based on span to depth ratio specified in is456 2000. Steel reinforced slabs typically between 100 and 500 mm thick are most often used to construct floors and ceilings while thinner mud slabs may be used for exterior paving see below.

For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. A concrete roof is exactly what it sounds like. Thickening the structure along the perimeter by another will serve as an integral footing adding strength where the loads are heaviest.