Roof Slab Reinforcement Design

Design of slab examples and tutorials by sharifah maszura syed mohsin example 1.

Roof slab reinforcement design.

If reinforced concrete were to be reused strong connections would have to be made between roof and walls. Thickness of the slab is decided based on span to depth ratio specified in is456 2000. Rcc roof slab reinforcement details if you follow the minimum standards for structural design for modern day buildings you can opt for creating the rcc without a beam it is called a flat slab. Reinforced concrete slabs are heavier and generate higher seismic forces in an event.

Such slabs left unconnected to walls caused many deaths in the 2005 quake from school roof collapses. The slab has to carry a distributed permanent action of 1 0 kn m2 excluding slab self weight and a variable action of 3. The diameter of bar generally used in slabs are. Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less.

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. Determine the dead load that is acting on the slab. 6 mm 8 mm 10 mm 12mm and 16mm. Minimum reinforcement is 0 12 for hysd bars and 0 15 for mild steel bars.

However the complexity of the generalized approach. Reinforcement projecting from the concrete or masonry walls is bent to the slope of the roof and lapped with the roof s rebar to pro vide secure anchorage. Simply supported one way slab a rectangular reinforced concrete slab is simply supported on two masonry walls 250 mm thick and 3 75 m apart. This is the design of roof how the reinforcement has been lated over here and how to be the covering lated over is 6 x6 inch and used 10 and 12 mm diameter bars.

Assume the thickness of slab take 4 cm per metre run of the span. Should not be less than 110 mm for rooms should not be less than 75 mm for sunshades. Identify the type of slab. The maximum diameter of bar used in slab should not exceed 1 8 of the total thickness of slab.

Flexural reinforcement must be greater than 0 0018 psi or the shrinkage reinforcement. Determine h min and round it to higher 10mm multiple. Design procedure of one way slab. 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.

A stiff concrete mix specified at 3000 psi is pumped into place as workers advance up the slope to vi brate and finish the concrete to the desired thickness.