Reinforced Concrete Roof Slab Thickness

Reinforced concrete slabs are heavier and generate higher seismic forces in an event.

Reinforced concrete roof slab thickness.

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. Exact specifications vary but most concrete roofs are several inches thick. The diameter of bar generally used in slabs are.

With that in mind i ve seen slabs as thick as 16 18 due to column spacing. Concrete slab design procedure steps to be followed in the design of slab assuming suitable bearings not less than 10cm find the span of the slab between the centers of bearings. Department of civil engineering n w f p uet peshawar design of reinforced concrete components of a house. Lb la 16 12 1 33 2 two way slab minimum depth of two way slab is given by formula hmin perimeter 180 2 16 12 12 180 3 73 in assume h 5.

For example we build residential in flat plate concrete which will typically have a column spacing of 20 oc and a slab thickness of 8 typ. Commercial is typically steel w a composite deck so you ll have a 5 6 slab sitting on top of steel beams. Such slabs left unconnected to walls caused many deaths in the 2005 quake from school roof collapses. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers.

For flatwork such as slabs on grade and driveways a minimum thickness of four inches is required but increasing the thickness to five inches can add nearly 50 percent to the load bearing capacity. Typical insulating roof deck form planks manufactured in north america and designed for cast in place reinforced concrete roof decks. A solid slab of concrete capping the top of your house. 6 mm 8 mm 10 mm 12mm and 16mm.

Minimum reinforcement is 0 12 for hysd bars and 0 15 for mild steel bars. Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less. If reinforced concrete were to be reused strong connections would have to be made between roof and walls. Cross section of a typical cast in place reinforced concrete roof deck formed with one of the typical icf planks shown in figure above.

Qaisar ali http www eec edu pk page 5 of 24.